Temat: 74.70.Vy - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Exchange Interaction as a Source of Real Space Pairing in High Temperature Superconductors and Heavy Fermions: a Brief Overview
Autorzy:: Spałek, J.
Powiązania:: https://bibliotekanauki.pl/articles/1860823.pdf
Data publikacji:: 1994-01
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 71.28.+d
75.10.Lp
74.70.Vy
Opis:: We characterize the principal difference between the pairing induced by the kinetic exchange interactions for the Fermi-liquid and spin-liquid phases. In the case of hybridized electrons the Kondo-exchange induced pairing is invoked, whereas for a single narrow-band case kinetic exchange is responsible for the spin singlet pairing. The former interaction is applied to heavy-fermion systems, whereas the latter is employed to the high temperature superconductors. The current situation concerning the applicability of our theoretical models is briefly and critically assessed.
Źródło:: Acta Physica Polonica A; 1994, 85, 1; 39-52
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Effect of Cation Substitution in "123"-type Superconducting Oxides on Powder Diffraction Intensities
Autorzy:: Łasocha, W.
Hodorowicz, S. A.
Chodorowicz-Bąk, A.
Eick, H. A.
Powiązania:: https://bibliotekanauki.pl/articles/1920530.pdf
Data publikacji:: 1992-03
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 74.70.Vy
Opis:: This research was undertaken to determine whether by powder diffraction substitution in the "123"-type high T$\text{}_{c}$ oxides, Ln$\text{}_{1-x}$M$\text{}_{x}$Ba$\text{}_{2-y}$M$\text{}_{y}$Cu$\text{}_{3-z}$M$\text{}_{z}$O$\text{}_{6.5+δ}$ (where Ln = lanthanoid, M$\text{}_{x}$ = Me$\text{}^{3+}$, M$\text{}_{y}$ = Me$\text{}^{3+}$ and M$\text{}_{z}$ = Me$\text{}^{3+}$ and Me$\text{}^{2+}$) could be detected unequivocally. Numerous X-ray and a few neutron powder diffractograms were calculated for substituted compounds. Reflections most sensitive to substitution and the influence of site occupancy for Cu and O atoms are also characterized. The results are compared with some experimental data reported in the literature.
Źródło:: Acta Physica Polonica A; 1992, 81, 3; 397-404
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

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

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Skocz do pozycji: 4.

Tytuł:: Surface of BiSrCaCuO Single Crystal Observed by Means of Scanning Tunneling Microscope
Autorzy:: Witek, A.
Reich, A.
Czajka, R.
Pajączkowska, A.
Rauluszkiewicz, J.
Powiązania:: https://bibliotekanauki.pl/articles/1891851.pdf
Data publikacji:: 1991-11
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 74.70.Vy
61.16.Di
68.35.Bs
Opis:: The topographic images of a Bi$\text{}_{0.7}$Pb$\text{}_{0.3}$SrCaCu$\text{}_{1.8}$O$\text{}_{x}$ single crystal were studied by means of the scanning tunneling microscope. The structure of terraces and steps seen on the surface reflects the crystallographic structure of bulk.
Źródło:: Acta Physica Polonica A; 1991, 80, 5; 717-722
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: The Influence of the Microwave Power on Josephson Microwave Absorption in High- Temperature Superconductors
Autorzy:: Czyżak, B.
Stankowski, J.
Powiązania:: https://bibliotekanauki.pl/articles/1887983.pdf
Data publikacji:: 1991-07
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 74.50.+r
74.70.Vy
Opis:: The influence of the microwave power on the internal Josephson Junction System (JJS) in granular high T$\text{}_{c}$, superconductors was investigated using EPR methodology. Josephson Microwave Absorption signal was used to monitor local temperature of the Josephson Junction System while the bulk sample temperature was measured by a thermocouple. The effect of the JJS overheating is discussed as the consequence of an interaction between JJS, microwave field and the bulk sample.
Źródło:: Acta Physica Polonica A; 1991, 80, 1; 99-106
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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