一些高T_c超导体的弹性性质

THE ELASTIC PROPERTIES OF SOME HIGH T_c SUPERCONDUCTORS

本文用超声相比较方法测定了高 T_c超导体La_(1.85)Sr_(0.15)CuO_7,La_2CuO_4和YBa_2CuO_7的纵波和横波声速,进而导出了它们的纵向模量、切变模量、杨氏模量、泊松比、德拜温度及定体比热。在La_(1.85)Sr_(0.15)CuO_4样品上,还进行了压力实验,发现所有弹性模量都是随压强增加而增加。定体比热c_v和泊松比σ在高压下则略有下降。德拜温度是随压强增加而增加的。

By using ultrasonic phase comparison method, the longitudinal and shear wave velocities of high Tc superconductors of La2CuO4 La1.85Sr0.15CuO4 and YBa2Cu3O7 have determined. The high pressure results on La1.85Sr0.15CuO4 are also obtained. Based on experimental results, some important elastic characters are derived and superconducting properties are also discussed.