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摘要: 本文用超声相比较方法测定了高Tc超导体La1.85Sr0.15CuO4，La2CuO4和YBa2Cu3O7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La1.85Sr0.15CuO4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cV和泊松比在高压下则略有下降。德拜温度是随压强增加而增加的。Abstract: 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.
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Key words:
- superconductor /
- elastic property /
- Debye temperature /
- pressure
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Fancois M, Yvon K, Fisher P, et al. Solid State Commu, 1987, 63: 35. Jorgensen J D, Beno M A, Hinks D G, et al. Phy Rev B, 1987, 36: 3608. Ledbetter H M, Austin M W, Kim S A, et al. J Mater Res, 1987, 2: 786. Almond D P, Lambson E, Saunders G A, et al. J Phys F: Met Phys, 1987, 17: L221. Horie Y, Terashi Y, Fukuda H, et al. Solid State Commu, 1987, 64: 501. Shoenberg D. Phy Rev, 1954, 96(2): 296. McMillon W L. Phy Rev, 1968, 167: 331. -
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