ULTRASONIC STUDY OF STRUCTURAL INSTABILITY OF MONOCRYSTALLINE AND POLYCRYSTALLINE BI-SR-CA-CU-O

被引：30

作者：

WANG, YN ^{[1
]}

WU, J ^{[1
]}

SHEN, HM ^{[1
]}

ZHU, JS ^{[1
]}

CHEN, XH ^{[1
]}

YAN, YF ^{[1
]}

ZHAO, ZX ^{[1
]}

机构：

[1] CHINESE ACAD SCI, DEPT PHYS, BEIJING, PEOPLES R CHINA

来源：

PHYSICAL REVIEW B | 1990年 / 41卷 / 13期

关键词：

D O I：

10.1103/PhysRevB.41.8981

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Two internal-friction (attenuation) peaks around 95 and 130 K in the polycrystal and single crystal of Bi-Sr-Ca-Cu-O are found to be related to the superconducting transition at 84 and 107 K, respectively. The jump of lattice parameter and shape-memory effect occurring at the peak temperatures reveal the characteristics of a martensitic transition. The velocity and attenuation versus temperature of ultrasonic longitudinal waves propagating along two directions in the a-b plane at 10°to the a and b axes and of [010] shear waves with [100] polarization were measured for the Bi2Sr2CaCu2O8 single crystals. The anisotropic elasticity in the c plane is manifested. Only the longitudinal waves in a direction and the shear waves show an obvious softening minimum of velocity around 250 K, which is associated with an attenuation peak due to a phaselike transition, but other longitudinal waves reveal a monotonic stiffening from room temperature down to Tc. The origin of the overall trend of elastic stiffening that appears in the measurements so far for high-Tc oxides is discussed. © 1990 The American Physical Society.

引用

页码：8981 / 8985

页数：5

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