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Tytuł:
Pseudorotational Averaging of EPR Spectrum of Cu(II)O$\text{}_{5}$ Complex in YBa$\text{}_{2}$Cu$\text{}_{3}$O$\text{}_{7-δ}$ in Low Temperatures
Autorzy:
Stankowski, J.
Kempiński, W.
Trybuła, Z.
Powiązania:
https://bibliotekanauki.pl/articles/1891644.pdf
Data publikacji:
1991-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.50.-f
74.70.Vy
76.30.Fe
Opis:
In low temperatures the condensation of oxygen was found to occur at 05 site in an elementary cell of YBa$\text{}_{2}$Cu$\text{}_{3}$O$\text{}_{7-δ}$ being the fifth ligand forming the CuO$\text{}_{5}$ complex around Cul copper in chain. This change of coordinantion from CuO$\text{}_{4}$ to CuO$\text{}_{5}$ is the origin of a pseudorotation related to a strong vibronic coupling of two distorted configurations: a tetragonal pyramid C$\text{}_{4v}$ and a trigonal bipyramid D$\text{}_{3h}$, which yields a pseudocubic EPR spectrum in low temperatures. The averaged spectroscopic splitting coefficient is related to a superposition of vibronically coupled orbital states |x$\text{}^{2}$ - y$\text{}^{2}$〉 and |3z$\text{}^{2}$ - r$\text{}^{2}$〉. The averaged spectrum was for the first time observed in low temperatures since the oxygen condensation in YBa$\text{}_{2}$Cu$\text{}_{3}$O$\text{}_{7-δ}$ at 05 site of the chain occur only when oxygen undergoing fast diffusion among the chains, gets localized with decreasing temperature. The activation energy of oxygen desorption from the 05 site is 36 K.
Źródło:
Acta Physica Polonica A; 1991, 80, 4; 571-581
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electron Paramagnetic Resonance of Cr$\text{}^{3+}$ in Rb$\text{}_{x}$(NH$\text{}_{4}$)$\text{}_{1-x}$Al(SO$\text{}_{4}$)$\text{}_{2}$·12H$\text{}_{2}$O
Autorzy:
Takhur, S.
Jain, V. K.
Powiązania:
https://bibliotekanauki.pl/articles/1931369.pdf
Data publikacji:
1994-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
76.30.Fc
Opis:
The EPR of Cr$\text{}^{3+}$ in mixed alum Rb$\text{}_{x}$(NH$\text{}_{4}$)$\text{}_{1-x}$Al(SO$\text{}_{4}$)$\text{}_{2}$·12H$\text{}_{2}$O has been studied at ca. 300 K and ca. 9.45 GHz. The EPR spectrum for x between 30 to 70% shows more than one kind of chromium complexes. The variation in magnitude of zero-field splitting parameter D indicates that the monovalent ions probably play an important role in the trigonal distortion of the water octahedron around the trivalent metal ion in alums.
Źródło:
Acta Physica Polonica A; 1994, 85, 6; 985-988
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hopping Conduction Mechanism in Amorphous CuO-Bi$\text{}_{2}$O$\text{}_{3}$ Pellets
Autorzy:
Motke, S. G.
Burghate, D. K.
Gawande, W. J.
Pakade, S. V.
Yawale, S. P.
Powiązania:
https://bibliotekanauki.pl/articles/1931822.pdf
Data publikacji:
1994-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.80.Ng
72.90.+y
Opis:
The transport properties of CuO-Bi$\text{}_{2}$O$\text{}_{3}$ pellets (pressed at room temperature 303 K) like dc electrical conductivity etc. are measured. The activation energy, dielectric constant etc. are reported. The hopping conduction is examined. Non-adiabatic hopping conduction is observed. The plot of -log σ versus 1/T is found to be linear. Activation energy of pellets containing CuO (80, 70, 60 mol%) shows electronic conduction while the pellet containing CuO (50 mol%) shows ionic conduction. The effect of content of CuO (mol%) and frequency on dielectric constant is also studied. The variation of dielectric constant with CuO (mol%) shows zigzag nature and may be due to the relaxation effects.
Źródło:
Acta Physica Polonica A; 1994, 86, 6; 969-978
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
"Ridge" Fermi Surface Study in Metallic (R)Ba$\text{}_{2}$Cu$\text{}_{3}$O$\text{}_{7-δ}$ (R = Y, Dy) and in Oxygen Deficient YBa$\text{}_{2}$Cu$\text{}_{3}$O$\text{}_{7-δ}$ by Positron Annihilation
Autorzy:
Hoffmann, L.
Manuel, Α. A.
Barbiellini, B.
Peter, Μ.
Shukla, A.
Walker, E.
Powiązania:
https://bibliotekanauki.pl/articles/1933509.pdf
Data publikacji:
1995-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
74.72.Jt
74.72.Βk
71.25.Ηc
78.70.Bj
Opis:
We present a detailed positron 2D-ACAR measurements study of the "ridge" Fermi surface of (R)Ba$\text{}_{2}$Cu$\text{}_{3}$O$\text{}_{7-δ}$ (R = Y, Dy) compared to full-potential linearized augmented plane wave and linear muffin-tin orbital calculations. From different 2D-ACAR projections measured in DyBa$\text{}_{2}$Cu$\text{}_{3}$O$\text{}_{7-δ}$, a 3D model of the momentum density of the ridge was established and is in good agreement with LMTO calculations of YΒa$\text{}_{2}$Cu$\text{}_{3}$O$\text{}_{7}$, confirming the description of the ridge Fermi surface by local density approximation calculations. The ridge is also studied in oxygen deficient YΒa$\text{}_{2}$Cu$\text{}_{3}$O$\text{}_{7-δ}$. With growing δ, the ridge disappears without changing in width. This is consistent with full-potential linearized augmented plane wave calculations of YΒa$\text{}_{2}$Cu$\text{}_{3}$O$\text{}_{6.5}$, and supports the phase separation model of Mesot et al.
Źródło:
Acta Physica Polonica A; 1995, 88, 1; 147-161
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Anisotropy of Magnetoresistance and Shubnikov-de Haas Oscillations in Organic Metal (ET)$\text{}_{3}$CuCl$\text{}_{4}$ • H$\text{}_{2}$O
Autorzy:
Pesotskii, S.
Kovalev, A. E.
Lyubovskii, R. B.
Kushch, N. D.
Powiązania:
https://bibliotekanauki.pl/articles/1933340.pdf
Data publikacji:
1995-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.90.+w
Opis:
Behavior of the magnetoresistance has been studied in organic quasi two-dimensional metal (ET)$\text{}_{3}$CuCl$\text{}_{4}$•H$\text{}_{2}$O. Shubnikov-de Haas oscillations have been observed at the magnetic field directions near H ∥ c*. The oscillations frequency at H ∥ c* equals 45 T that corresponds approximately to 1% of the first Brillouin zone cross-section. The angle dependence of the oscillations frequency allows one to imagine at least the part of Fermi surface in the form of cylinder with an axis along c*.
Źródło:
Acta Physica Polonica A; 1995, 87, 4-5; 773-776
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dilatomelric and Pyroelectric Study of Phase Transition in (CH$\text{}_{3}$)$\text{}_{2}$NH$\text{}_{2}$Al(SO$\text{}_{4}$)$\text{}_{2}$ · 6H$\text{}_{2}$O Ferroelectric Crystal
Autorzy:
Pykacz, H.
Powiązania:
https://bibliotekanauki.pl/articles/1943935.pdf
Data publikacji:
1995-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
64.70.Kb
65.70.+y
Opis:
The results of linear thermal expansion and pyroelectric coefficient are given for crystal of dimethylammoniumaluminium sulphate hexahydrate. Large anomalies of these quantities has been observed around the phase transition temperature at 151 K.
Źródło:
Acta Physica Polonica A; 1995, 88, 6; 1097-1101
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Coordination Defects in Vitreous As$\text{}_{2}$S$\text{}_{3}$ Induced by γ -irradiation
Autorzy:
Shpotyuk, O.
Balitska, V.
Powiązania:
https://bibliotekanauki.pl/articles/1967921.pdf
Data publikacji:
1997-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.55.Jv
Opis:
Destruction-polymerization transformations in vitreous As$\text{}_{2}$S$\text{}_{3}$, associated with coordination defects formation processes induced by γ-irradiation, were studied by the IR Fourier spectroscopy method in the region of 400-100 cm$\text{}^{-1}$. All topological variants of these processes, statistically possible in the investigated samples, were taken into account for physical consideration of the real structural changes.
Źródło:
Acta Physica Polonica A; 1997, 92, 3; 577-583
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Growth of Laser Ablated YBa$\text{}_{2}$Cu$\text{}_{3}$O$\text{}_{7}$ Thin Films Epitaxied on (100)MgO: Influence of In-Plane Misorientations on Low and High Frequency Properties
Autorzy:
Perrin, A.
Guilloux-Viry, M.
Castel, X.
Powiązania:
https://bibliotekanauki.pl/articles/1964240.pdf
Data publikacji:
1997-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.25.+i
81.15.-z
68.55.Jk
Opis:
The graphoepitaxial growth of c-axis YBa$\text{}_{2}$Cu$\text{}_{3}$O$\text{}_{7}$ laser ablated thin films on (100)MgO induces a competition between two main in-plane orientations due to the large lattice mismatch: ⟨100⟩ YBa$\text{}_{2}$Cu$\text{}_{3}$O$\text{}_{7}$ ∥ ⟨100⟩ MgO, c$\text{}_{⊥ 0}$ notation or ⟨110⟩ YBa$\text{}_{2}$Cu$\text{}_{3}$O$\text{}_{7}$ ∥ ⟨100⟩ MgO, c$\text{}_{⊥ 45}$ notation. The ratio of c$\text{}_{⊥ 45}$/c$\text{}_{⊥ 0}$ in-plane orientations (η), measured by X-ray diffraction φ scans, is ranging from 0.2% to 49.7% for the films reported here. Their crystalline qualities were compared on the basis of rocking curves (Δθ), electron channeling patterns and reflection high energy electron diffraction diagrams. The coexistence of c$\text{}_{⊥ 0}$ and c$\text{}_{⊥ 45}$ domains creates high angle grain boundaries. No degradation of T$\text{}_{c}$, residual resistance ratio (RRR) or ΔT$\text{}_{c}$ is observed when η increases. In contrast, a strong correlation between microwave losses characterized by surface resistance (R$\text{}_{S}$ at 10 GHz and 77 K), inductive losses S(χ") (surface of the χ" peak obtained in a.c. susceptibility at 119 Hz) and η was clearly evidenced. A minimum of losses was found for η between 3 and 6% suggesting the necessity of a low quantity of high angle grain boundaries for films optimization. Finally, some specific processes carried out recently in order to try to efficiently control η, then R$\text{}_{S}$ are discussed.
Źródło:
Acta Physica Polonica A; 1997, 92, 1; 115-125
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thin Film Crystallinity and Substrate Materials in Atomic Graphoepitaxy of YBa$\text{}_{2}$Cu$\text{}_{3}$O$\text{}_{x}$
Autorzy:
Miyazawa, S.
Mukaida, M.
Sasaura, M.
Powiązania:
https://bibliotekanauki.pl/articles/1964236.pdf
Data publikacji:
1997-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
74.76.Bz
74.80.-g
68.35.-p
Opis:
The complexity of a-/c-axis oriented growth of YBa$\text{}_{2}$Cu$\text{}_{3}$O$\text{}_{x}$ thin films is reviewed from the viewpoint of controlling a-axis preferred thin film growth. Perfectly c-axis in-plane-aligned a-axis oriented YBa$\text{}_{2}$Cu$\text{}_{3}$O$\text{}_{x}$ thin films, or "pure" a-axis oriented films, can be grown on the (100) face of tetragonal K$\text{}_{2}$NiF$\text{}_{4}$-type substrates by template growth process. A new growth mechanism called atomic graphoepitaxy is presented as a growth model. Transmission electron microscopy reveals that the films on a (100) SrLaGaO$\text{}_{4}$ substrate consist of domains surrounded by anti-phase and stackingfault boundaries. This domain formation can be well explained by substrate surface irregularities inherent in the SrLaGaO$\text{}_{4}$ crystal. The formation of defects in microstructures in "pure" a-axis oriented YBa$\text{}_{2}$Cu$\text{}_{3}$O$\text{}_{x}$ thin films is also modeled based on our atomic graphoepitaxial growth model.
Źródło:
Acta Physica Polonica A; 1997, 92, 1; 85-96
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dielectric Dispersion Studies in (CH$\text{}_{3}$)$\text{}_{2}$NH$\text{}_{2}$Ga(SO$\text{}_{4}$)$\text{}_{2}$ - 6H$\text{}_{2}$O(DMAGaS) Crystal
Autorzy:
Czapla, Z.
Tchukvinskyi, R.
Powiązania:
https://bibliotekanauki.pl/articles/1968862.pdf
Data publikacji:
1998-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
77.80.Bh
Opis:
The paper presents the new data of dielectric dispersion in DMAGaS crystal. The very pronounced dispersion above T$\text{}_{c1}$ =136 K is observed in the frequency range 100 Hz-30 MHz with a single relaxation process. The relaxation time τ of an electric dipole reaches 2.17×10$\text{}^{-7}$ s at the T$\text{}_{c1}$. The activation free energy ΔF of the dipoles is estimated to be equal to 0.087 eV. The order-disorder type of phase transition is confirmed.
Źródło:
Acta Physica Polonica A; 1998, 93, 3; 527-530
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wyrok Sądu Metropolitalnego w Katowicach (w trzeciej instancji) c. Sobański z 20 listopada 1997 r. w sprawie o nieważność małżeństwa z tytułu niezdolności do podjęcia istotnych obowiązków małżeńskich (k. 1095, n. 3) oraz błędu co do przymiotu osoby (kan.
La sentenza del Tribunale Metropolitano di Katowice (in terza istanza) c. Sobański del 20 novembre 1997 in causa di nullità del matrimonio dal titolo della „incapacites” (can. 1095, n.3) e dell’errore circa la qualità della persona (can. 1097).
Autorzy:
Sobański, Remigiusz
Powiązania:
https://bibliotekanauki.pl/articles/663239.pdf
Data publikacji:
1998
Wydawca:
Uniwersytet Kardynała Stefana Wyszyńskiego w Warszawie
Tematy:
nieważność małżeństwa
niezdolność do podjęcia istotnych obowiązków małżeńskich
obowiązek małżeński
błąd co do przymiotu osoby
kanon 1095, n. 3 KPK
kanon 1097 §2 KPK
nullity of marriage
incapacity to fulfil conjugal duty
conjugal duty
error as to the quality of person
canon 1095 n. 3 CIC/1983
canon 1097 § 2 CIC/1983
Opis:
Si tratta della sentenza negativa emanata nel tribunale di IIΙ istanza da due titoli: della incapacità                                e dell'errore circa la qualità della persona. Il Tribunale di prima istanza ha esaminato la causa da qutatro titoli decretando „pro vinculo”, mentre il tribunale d’apello ha emanato sentenza affirmativa solo da due titoli sopra indicati.  
Źródło:
Ius Matrimoniale; 1998, 9, 3; 217-227
1429-3803
2353-8120
Pojawia się w:
Ius Matrimoniale
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Molecular dynamics study of temperature-induced structural changes in YBa2Cu3O7 crystal
Autorzy:
Bośko, J.
Sadowski, W.
Powiązania:
https://bibliotekanauki.pl/articles/1954521.pdf
Data publikacji:
1999
Wydawca:
Politechnika Gdańska
Tematy:
MD simulations
structure
phase transition
oxygen diffusion
trajectory
Opis:
The structure of YBa2Cu3O7 crystal has been studied with the aid of molecular-dynamics (MD) technique. A two-body model potentials proposed by Zhang and Catlow have been used in MD simulations performed in wide range of temperature. The temperature-induced orthorhombic-to-tetragonal phase transition is observed. The distruction of the arrangement of atoms in the CuO chains due to diffusion of oxygen atoms is observed. The diffusion coefficients are calculated, and their variation as a function of temperature is analysed. The activation energy is estimated.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 1999, 3, 3; 293-302
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optical and Dilatometric Properties of (CH$\text{}_{3}$)$\text{}_{2}$NH$\text{}_{2}$Al(SO$\text{}_{4}$)$\text{}_{2}$·6H$\text{}_{2}$O Crystals in Paraelectric and Ferroelectric Phases
Autorzy:
Podsiadła, D.
Czapla, Z.
Andriyevsky, B.
Myshchyshyn, O.
Powiązania:
https://bibliotekanauki.pl/articles/2011078.pdf
Data publikacji:
1999-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
64.70.Kb
78.20.Fm
Opis:
Experimental investigation of the thermal linear expansion l(T) and temperature dependencies of the interference optical path difference D(T) were carried out for (CH$\text{}_{3}$)$\text{}_{2}$ NH$\text{}_{2}$Al(SO$\text{}_{4}$)$\text{}_{2}$·6H$\text{}_{2}$O crystal, in the range of 120-310 K for three crystal physical directions. Decrease in electrostriction coefficients g of crystal was observed on approaching the phase transition point T$\text{}_{c}$ ≈ 150 K in ferroelectric phase. Relative temperature changes of the lengthening δl/l and refractive index δn/(n-1) are of the same order of magnitude. Peculiarities of temperature dependence of dilatometric and optical parameters of (CH$\text{}_{3}$)$\text{}_{2}$NH$\text{}_{2}$Al(SO$\text{}_{4}$)$\text{}_{2}$·6H$\text{}_{2}$O testify for qualitative reconstruction of chemical bonds in the crystal when temperature changes in the same phase.
Źródło:
Acta Physica Polonica A; 1999, 96, 3-4; 409-416
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparison of Flux Pinning in Single Crystals and Melt-Textured YBa$\text{}_{2}$Cu$\text{}_{3}$O$\text{}_{7-x}$
Autorzy:
Puźniak, R.
Wiśniewski, A.
Baran, M.
Zhou, L.
Powiązania:
https://bibliotekanauki.pl/articles/2012973.pdf
Data publikacji:
2000-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
74.60.Ge
74.60.Jg
74.72.Bk
Opis:
Flux pinning properties of single crystals and melt-textured samples of YBa$\text{}_{2}$Cu$\text{}_{3}$O$\text{}_{7-x}$ were studied for external magnetic field oriented parallel and perpendicular to the CuO$\text{}_{2}$ planes (ab-planes). For H ∥ ab vortex behaviour is mainly determined by a very effective intrinsic pinning mechanism. The irreversibility line is located in the region of higher fields and temperatures in comparison with the irreversibility line for H ⊥ ab. In a single crystal for H ⊥ ab, we observed an increase in the critical current density j$\text{}_{c}$ with magnetic field - the so-called "fishtail effect" - in a very broad temperature range. For H ∥ ab, this effect is observed only at temperatures close to T$\text{}_{c}$, when the intrinsic pinning is much weaker.
Źródło:
Acta Physica Polonica A; 2000, 97, 3; 373-376
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Absorptions and Emissions for the TmCl$\text{}_{6}^{3-}$ Ion in Cs$\text{}_{2}$NaTmCl$\text{}_{6}$
Autorzy:
Acevedo, R.
Hurtado, O. F.
Portillo, C.
Stręk, W.
Powiązania:
https://bibliotekanauki.pl/articles/2029252.pdf
Data publikacji:
2001-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
32.70.Fw
Opis:
In this work we report both experimental and theoretical studies regarding the Cs$\text{}_{2}$NaTmCl$\text{}_{6}$ elpasolite-type system, for which we have an updated database from linear and nonlinear optics. Both the absorption and the emission spectra for this system are rather complicated and a generalized vibronic crystal field-closure-ligand polarization calculation model has been employed to rationalize the observed spectral intensities. The calculation has been carried out by neglecting the interaction among the internal and the external vibrations and theoretical calculations have been performed with reference to both the emissions $\text{}^{3}$H$\text{}_{4}$(Γ$\text{}_{i}$)>$\text{}^{3}$F$\text{}_{4}$(Γ$\text{}_{j}$) and the absorptions $\text{}^{3}$H$\text{}_{6}$(A$\text{}_{1}$)> $\text{}^{3}$F$\text{}_{4}$(Γ$\text{}_{i}$), $\text{}^{1}$G$\text{}_{4}$(Γ$\text{}_{i}$), $\text{}^{3}$H$\text{}_{5}$(Γ$\text{}_{l}$) withΓ$\text{}_{k}$ (k=i,j)=A$\text{}_{1}$,E,T$\text{}_{1}$,T$\text{}_{2}$ andΓ$\text{}_{l}$=E, $\text{}^{a}$T$\text{}_{1}$, $\text{}^{b}$T$\text{}_{1}$,T$\text{}_{2}$. The advantages and disadvantages of our model calculation are discussed in the text, and despite the simplicity of the model it is shown that it has got some utility and flexibility to gain understanding in these complex phenomena.
Źródło:
Acta Physica Polonica A; 2001, 100, 6; 829-844
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł

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