PHONON CONTRIBUTION TO HIGH-Tc STATES IN OXIDE SUPERCONDUCTORS AND Nb3Ge.

被引:0
|
作者
Fukami, T. [1 ]
Horie, Y. [1 ]
Yasuda, T. [1 ]
Ono, F. [1 ]
Cheng, M.L. [1 ]
Takano, S. [1 ]
Mase, S. [1 ]
机构
[1] Kyushu Univ, Fukuoka, Jpn, Kyushu Univ, Fukuoka, Jpn
来源
Physica B: Physics of Condensed Matter & C: Atomic, Molecular and Plasma Physics, Optics | 1987年 / 148卷 / 1-3期
关键词
CERAMIC MATERIALS - LANTHANUM COMPOUNDS - NIOBIUM AND ALLOYS - PHONONS;
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学科分类号
摘要
The temperature dependences of the ultrasonic attenuation coefficient alpha (T) were investigated for (La//xSr//1// minus //x)//2CuO//4 and YBa//2Cu//3O//7. In each oxide two peaks were observed in the alpha (T) versus T plot which are due to optic phonons. The phonon dispersion curves along the DELTA -line (a-axis) and DELTA -line (c-axis) were calculated taking account of these acoustic data. On the basis of these dispersion curves the origin of the very high T//c in YBa//2Cu//3O//7 is ascribed mainly to the existence of the Cu-O linear chain decorated with contracted Cu-O side bonds. Furthermore, an instability of the high-T//c state of the A-15 type Nb//3Ge phase was also investigated.
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页码:521 / 523
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