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Wyświetlanie 1-15 z 174
Tytuł:
Transport and Magnetic Properties of Rare Earth Compounds Epitaxially Grown on Semiconductors
Autorzy:
Chroboczek, Jan
Powiązania:
https://bibliotekanauki.pl/articles/1888050.pdf
Data publikacji:
1991-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.20.My
68.55.-a
75.50.Pp
Opis:
Growth, crystallographic structure, electrical transport and magnetic properties of cubic Er pnictides and hexagonal Er silicide layers, epitaxially grown on semiconductors, are reviewed. Magnetoresistance anomalies observed at low temperatures are discussed in terms of a model developed for electron-magnetic moment interactions in antiferromagnetic systems.
Źródło:
Acta Physica Polonica A; 1991, 80, 2; 179-192
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Rarefied Band in Spectrum of Two-Magnon States of Heisenberg Ferromagnet of Clock Dial Plate
Autorzy:
Lulek, T.
Wal, A.
Powiązania:
https://bibliotekanauki.pl/articles/1933552.pdf
Data publikacji:
1995-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
05.50.+q
75.30.Ds
02.20.-a
75.Jm
Opis:
The Heisenberg isotropic exchange Hamiltonian with the nearest neighbour interactions for the ring of N = 12 nodes (the clock dial plate) with the spin 1/2 has been diagonalized within the manifold of all 66 two-magnon excitations from the ferromagnetic ground state. The spectrum consists of 5 full bands, i.e. bands defined over the whole Brillouin zone, and a single band which is doubly rarefied, i.e. defined only for even values of quasimomentum. The rarefied band is found to be dispersionless outside the centre of the Brillouin zone. It separates two bands of "weakly bounded" spin waves from two other which are "weakly antibounded". The last remaining band is situated below this collection of scattered spin waves, and describes two tightly bounded spin deviations. The spectrum exhibits dispersion, but it is degenerate (singlet and quintet) at the boundary of the Brillouin zone.
Źródło:
Acta Physica Polonica A; 1995, 88, 2; 259-268
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Racah Recoupling Matrices for System of Two Free Electrons Confined To Single Star
Autorzy:
Lulek, T.
Kłos, J.
Powiązania:
https://bibliotekanauki.pl/articles/1945688.pdf
Data publikacji:
1996-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
02.20.-a
31.10.+z
75.10.Lp
75.20.-g
Opis:
Racah-Wigner type of calculus is adapted to the system of two free electrons in a cubic box, confined to a single star p00 of quasimomentum. Various coupling schemes (LS-like, jj-like, and transitive) have been reviewed in analogy to the case of a free atom. Racah recoupling matrices are calculated explicitly, and their quantum-mechanical meaning is exposed in terms of octahedral multipoles.
Źródło:
Acta Physica Polonica A; 1996, 90, 3; 483-490
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Real-Time Spectroscopy of Acoustic Waves or Music as Physical Phenomenon
Autorzy:
Zieliński, P.
Powiązania:
https://bibliotekanauki.pl/articles/1945188.pdf
Data publikacji:
1996-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
43.75.+a
43.66.+y
43.64.+r
Opis:
The sounds used in music have discrete spectra consisting of a fundamental frequency and of its integer multiples. This is the reason for an affinity of the sounds for which the ratio of the fundamental frequencies is given by a fraction of small integers. Two possible physical mechanisms for this affinity are discussed: (1) an influence of beats between some partial tones and (2) nonlinear interactions between partial tones. Some facts from the music theory are then explained as resulting from the invariance of the most consonant intervals between affine sounds against variations of the timbre and of the register. An analogy is indicated between the classical cadence and the lock-in effect in incommensurate crystals. The lecture is illustrated with extracts from the J.S. Bach Das Wohltemperierte Klavier, the W.A. Mozart sonata for piano KV 570 and a recitative from the Haendel Messiah.
Źródło:
Acta Physica Polonica A; 1996, 89, 2; 265-271
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetic Properties of Thin Films of Fe-Cu-R-Si-B Alloys with R = Nd, Gd, Ho, Y
Autorzy:
Gościańska, I.
Ratajczak, H.
Urbaniak, M.
Konč, M.
Powiązania:
https://bibliotekanauki.pl/articles/1953190.pdf
Data publikacji:
1997-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
68.55.-a
75.70.-i
Opis:
Hysteresis loops of thin films of Fe$\text{}_{73.5}$Cu$\text{}_{1}$R$\text{}_{3}$Si$\text{}_{13.5}$B$\text{}_{9}$ (R = Nd, Gd, Ho, Y) alloys were studied by the magnetooptical Faraday method. The films were deposited by flash evaporation technique onto cooled glass substrates. Lanthanides were chosen as substitutes for niobium in the FINEMET type alloys. Coercivity, H$\text{}_{c}$, was determined from the easy- and hard-axis hysteresis loops. The as-deposited films containing Gd and Ho are characterized by rather low values of H$\text{}_{c}$ while the films with Nd and Y show a high isotropic value of H$\text{}_{c}$. Attempts were made to determine the conditions of the film annealing which would ensure the optimum soft magnetic properties of the films studied.
Źródło:
Acta Physica Polonica A; 1997, 91, 1; 237-240
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Metals and Semimetals with Strongly Correlated Electrons
Autorzy:
Fulde, P.
Powiązania:
https://bibliotekanauki.pl/articles/1953157.pdf
Data publikacji:
1997-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.20.Hr
71.27.+a
71.10.Fd
75.30.Mb
Opis:
A characteristic feature of strongly correlated electrons is the appearance of low energy scales. They may result in heavy-quasiparticle excitations at low temperatures. Our understanding of these excitations has been considerably modified over the last few years. While it was originally thought that the Kondo effect is the sole source of heavy-fermion behavior, two additional mechanisms have been identified meanwhile. One is based on the Zeeman effect and occurs in Nd$\text{}_{2-x}$Ce$\text{}_{x}$CuO$\text{}_{4}$. The other is operative in the semimetal Yb$\text{}_{4}$As$\text{}_{3}$ and is based on nearly half filled one-dimensional Hubbard chains. In all three cases the low energy excitations result from spin degrees of freedom.
Źródło:
Acta Physica Polonica A; 1997, 91, 1; 67-76
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On Stability of Frustrated Quantum Magnetic States in Fullerenes
Autorzy:
Koper, A.
Mucha, M.
Powiązania:
https://bibliotekanauki.pl/articles/1964713.pdf
Data publikacji:
1997-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
74.70.Wz
61.46.+w
71.10.-w
71.27.+a
75.10.Jm
02.50.Ng
02.70.Lq
Opis:
Gutzwiller variational ground states |Φ$\text{}^{G}$⟩ of π electrons, described by single-band half-filling Hubbard model, were determined for the molecules C$\text{}_{60}$ and C$\text{}_{70}$ and their energies and magnetic properties investigated. To construct these states two types of trial functions were used: generalized spin-density wave |Φ$\text{}_{SD}$⟩ and tight-binding wave |Φ$\text{}_{ΤΒ}$⟩. Our results evidently show that the Gutzwiller state |Φ$\text{}_{TΒ}^{G}$⟩ determined by means of function |Φ$\text{}_{ΤΒ}$⟩ has lower energy than the other investigated variational states |Φ$\text{}_{SD}^{G}$⟩. Mean values of the operators in the Gutzwiller states were calculated using Monte Carlo method.
Źródło:
Acta Physica Polonica A; 1997, 92, 2; 395-398
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Phase Diagram of Spin-Orbital Model
Autorzy:
Oleś, A. M.
Feiner, L. F.
Zaanen, J.
Powiązania:
https://bibliotekanauki.pl/articles/1964677.pdf
Data publikacji:
1997-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.27.+a
75.30.Et
75.40.-s
75.10.Jm
Opis:
We show that the mean-field phase diagram of the realistic spin-orbital model derived for a perovskite lattice in three dimensions consists of four different classical magnetic phases which become degenerate at orbital degeneracy. The quantum fluctuations are drastically enhanced and suppress the classical long-range order, providing a new mechanism to stabilize a quantum spin liquid near the multicritical point.
Źródło:
Acta Physica Polonica A; 1997, 92, 2; 367-370
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electrical, Magnetic, and Structural Properties of Sn$\text{}_{1-x}$Mn$\text{}_{x}$Te Layers Grown by Molecular Beam Epitaxy
Autorzy:
Nadolny, A. J.
Sadowski, J.
Story, T.
Dobrowolski, W.
Arciszewska, M.
Świątek, K.
Kachniarz, J.
Adamczewska, J.
Powiązania:
https://bibliotekanauki.pl/articles/1992036.pdf
Data publikacji:
1998-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.20.Ck
75.30.Et
68.55.-a
Opis:
Layers of Sn$\text{}_{1-x}$Mn$\text{}_{x}$Te (x ≤ 0.1) with thickness 0.2-2 μm were grown by molecular beam epitaxy on BaF$\text{}_{2}$ substrates with a 0.01-1 μm thick SnTe buffer layer. Both SnTe and Sn$\text{}_{1-x}$Mn$\text{}_{x}$Te layers show metallic p-type conductivity with conducting hole concentrations (at T=77 K) p$\text{}_{77}$=7×10$\text{}^{19}$ -2×10$\text{}^{21}$ cm$\text{}^{-3}$. The layers grown under the conditions of an extra Te flux have a high carrier concentration and exhibit ferromagnetic phase transition at T$\text{}_{C}$ ≤ 7 K. The layers grown with no (or very low) additional Te flux show low carrier concentrations (below 10$\text{}^{20}$ cm$\text{}^{-3}$) and remain paramagnetic in the temperature range studied T=4.5÷70 K.
Źródło:
Acta Physica Polonica A; 1998, 94, 3; 449-453
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Stm Observed Surface Structures and Magnetic Properties of MBE-Grown Metallic Thin Films
Autorzy:
Kalinowski, R.
Baczewski, L. T.
Wawro, A.
Meyer, C.
Raułuszkiewicz, J.
Powiązania:
https://bibliotekanauki.pl/articles/1968820.pdf
Data publikacji:
1998-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.70.Ak
68.55.-a
68.60.Dv
Opis:
Rare-earth epitaxial thin films of Tb and Gd of the thicknesses betweeRare-earth epitaxial thin films of Tb and Gd of the thicknesses between 2 nm and 16 nm were deposited by means of molecular beam epitaxy method. The roughness of the rare-earth films measured by scanning tunneling microscopy was found to be in the range of 1-4.5 nm. The influence of the roughness on the dipolar anisotropy and magnetocrystalline surface anisotropy was estimated. The magnetic measurements have shown that the Gd layers deposited on the Y buffer layers had an easy plane anisotropy. However, for 2 nm thick Gd layer deposited on W buffer layer the perpendicular anisotropy was observed. According to the roughness analysis the possible sources of the perpendicular anisotropy in this sample is mainly the magnetoelastic anisotropy, but the presence of the magnetocrystalline surface anisotropy also cannot be neglected.n 2 nm and 16 nm were deposited by means of molecular beam epitaxy method. The roughness of the rare-earth films measured by scanning tunneling microscopy was found to be in the range of 1-4.5 nm. The influence of the roughness on the dipolar anisotropy and magnetocrystalline surface anisotropy was estimated. The magnetic measurements have shown that the Gd layers deposited on the Y buffer layers had an easy plane anisotropy. However, for 2 nm thick Gd layer deposited on W buffer layer the perpendicular anisotropy was observed. According to the roughness analysis the possible sources of the perpendicular anisotropy in this sample is mainly the magnetoelastic anisotropy, but the presence of the magnetocrystalline surface anisotropy also cannot be neglected.
Źródło:
Acta Physica Polonica A; 1998, 93, 2; 409-413
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Kondo-Lattice Metals and Semiconductors with Compensated Magnetic Moments: a Brief Overview
Autorzy:
Spałek, J.
Doradziński, R.
Powiązania:
https://bibliotekanauki.pl/articles/2011147.pdf
Data publikacji:
1999-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.27.+a
71.10.Fd
75.30.Mb
Opis:
We provide a brief overview of recent theoretical results concerning the metallic and insulating states with very heavy quasiparticle masses and almost compensated magnetic moments, primarily in the antiferromagnetic state. The temperature dependence of the Kondo-insulator band gap is also discussed.
Źródło:
Acta Physica Polonica A; 1999, 96, 5; 677-688
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Complex Magnetic Structure of Strongly Coupled Fe/Si Multilayers
Autorzy:
Dubowik, J.
Stobiecki, F.
Szymański, B.
Kudryavtsev, Yu. V.
Grabias, A.
Kopcewicz, M.
Powiązania:
https://bibliotekanauki.pl/articles/2013056.pdf
Data publikacji:
2000-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.70.-i
68.55.-a
76.50.+g
Opis:
Fe/Si multilayers with strong bilinear and biquadratic couplings were investigated. A complex structure revealed by the Mössbauer spectroscopy corresponds to multimode ferromagnetic resonance spectra in a non-saturated state. Simple dispersion relations for antiferromagnetic coupled bilayer structures are shown to be inapplicable to the Fe/Si multilayers with a strong biquadratic component to the antiferromagnetic bilinear coupling.
Źródło:
Acta Physica Polonica A; 2000, 97, 3; 451-454
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Correlation Functions in the Spin-fermion Model
Autorzy:
Bała, J.
Oleś, A. M.
Powiązania:
https://bibliotekanauki.pl/articles/2012895.pdf
Data publikacji:
2000-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.27.+a
75.10.-b
74.72.-h
79.60.-i
Opis:
We show that the quasiparticle states found in a self-consistent Born approximation for the spin-fermion model which describes CuO$\text{}_{2}$ planes agree well with experimental data in insulating Sr$\text{}_{2}$CuO$\text{}_{2}$Cl$\text{}_{2}$. It is found that the antiferromagnetic correlations are reduced in the neighbourhood of a moving oxygen hole and the correlation functions can exhibit similar dipolar distortions as reported in the context of the t-J model.
Źródło:
Acta Physica Polonica A; 2000, 97, 1; 213-216
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetic Properties and GMR of Sputtered Permalloy/Au Multilayers
Autorzy:
Szymański, B.
Stobiecki, F.
Powiązania:
https://bibliotekanauki.pl/articles/2013183.pdf
Data publikacji:
2000-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.70.-i
75.70.Pa
68.55.-a
Opis:
We report on structural, magnetic, and GMR properties of permalloy/Au multilayers where permalloy = Ni$\text{}_{83}$Fe$\text{}_{17}$, deposited by face-to-face sputtering onto Si(111) substrate. X-ray diffraction studies confirmed a good structural quality of our multilayers. The samples were characterised with vibrating sample magnetometer, longitudinal magnetooptical Kerr effect and giant magnetoresistance measurements. It was determined that our multilayers are magnetically very soft with H$\text{}_{c}$ ≈ 1 Oe and show uniaxial anisotropy with H$\text{}_{K}$ ≈ 5 Oe. For gold sublayer thickness d$\text{}_{Au}$ close to 1.1 nm the antiferromagnetic coupling is present in very narrow Au thickness range (≈ 0.2 nm). Despite a good structural quality of samples relatively small giant magnetoresistance value (1.2% at room temperature) was found. It is due to non-perfect aniferromagnetic coupling caused by pinholes.
Źródło:
Acta Physica Polonica A; 2000, 97, 3; 535-538
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spin Excitations in Doped Manganites
Autorzy:
Oleś, A. M.
Feiner, L. F.
Powiązania:
https://bibliotekanauki.pl/articles/2012881.pdf
Data publikacji:
2000-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.30.Ds
75.30.Et
71.27.+a
Opis:
We generalize the double exchange to describe holes doped in degenerate e$\text{}_{g}$ orbitals in La$\text{}_{1-x}$A$\text{}_{x}$MnO$\text{}_{3}$ manganites, where A are divalent alkaline earth ions. Assuming an orbital liquid of disordered e$\text{}_{g}$ orbitals we find isotropic ferromagnetic exchange interactions which increase with hole doping. The magnon dispersion agrees very well with the experimental data in ferromagnetic metallic manganites.
Źródło:
Acta Physica Polonica A; 2000, 97, 1; 193-196
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 174

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