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| 11. |
Mo¨ssbauer detection of photoinduced effects in HTSCYBa2(Cu1−x57Fex)3O6+&dgr; |
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Low Temperature Physics,
Volume 24,
Issue 12,
1998,
Page 908-910
V. V. Eremenko,
D. V. Lukashev,
V. L. Ponomarchuk,
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摘要:
Photoinduced changes of the effective magnetic field on57Fenuclei at the Cu(2) site are detected by the Mo¨ssbauer technique inYBa2(Cu0.9257Fe0.08)3O6.3.The effect is found to be reversible for several hours in the temperature range 100–300 K. ©1998 American Institute of Physics.
ISSN:1063-777X
DOI:10.1063/1.593513
出版商:AIP
年代:1998
数据来源: AIP
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| 12. |
On the mechanism of critical temperature enhancement in cuprate high-Tcsuperconductors under pressure |
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Low Temperature Physics,
Volume 24,
Issue 12,
1998,
Page 911-913
E. A. Pashitskiı˘,
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PDF (71KB)
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摘要:
The results of experiments [C. Y. Han &etal;, Low Temp. Phys.24, 305 (1998)] on the influence of quasi-hydrostatic pressurePon the superconducting transition temperatureTcin polycrystalline samples of cuprate compoundsTl2Ba2Ca2Cu3Ox(Tl-2223) with the initial value ofTc=129&hthinsp;Kand the maximum valueTc=255.4&hthinsp;KatP=4.3&hthinsp;GPaare considered. A hypothesis on the existence of two mechanisms of the effect of pressure onTcis proposed on the basis of an analysis of the nonmonotonic dependence ofTconP.The first mechanism operating in the pressure rangeP<3&hthinsp;GPais connected with the anisotropic deformation of the crystal lattice of individual grains (crystallites) in the plane of cuprate layersCuO2and with a change in the oxygen doping of layers. The second mechanism operating in the pressure rangeP>3&hthinsp;GPais due to hydrostatic compression of the ionic lattice and an increase in the bulk concentration of charge carriers (holes) in view of the electroneutrality condition. ©1998 American Institute of Physics.
ISSN:1063-777X
DOI:10.1063/1.593514
出版商:AIP
年代:1998
数据来源: AIP
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