La2CuO4+和La2-xSrxCuO4系统中的电子输运性质

周建十 Chan J Goodenough J B

周建十, Chan J, Goodenough J B. La2CuO4+和La2-xSrxCuO4系统中的电子输运性质[J]. 高压物理学报, 1993, 7(2): 81-91 . doi: 10.11858/gywlxb.1993.02.001
引用本文: 周建十, Chan J, Goodenough J B. La2CuO4+和La2-xSrxCuO4系统中的电子输运性质[J]. 高压物理学报, 1993, 7(2): 81-91 . doi: 10.11858/gywlxb.1993.02.001
ZHOU Jian-Shi, Chan J, Goodenough J B. Electron Transport in the Systems La2CuO4+ and La2-xSrxCuO4[J]. Chinese Journal of High Pressure Physics, 1993, 7(2): 81-91 . doi: 10.11858/gywlxb.1993.02.001
Citation: ZHOU Jian-Shi, Chan J, Goodenough J B. Electron Transport in the Systems La2CuO4+ and La2-xSrxCuO4[J]. Chinese Journal of High Pressure Physics, 1993, 7(2): 81-91 . doi: 10.11858/gywlxb.1993.02.001

La2CuO4+和La2-xSrxCuO4系统中的电子输运性质

doi: 10.11858/gywlxb.1993.02.001
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    通讯作者:

    周建十

Electron Transport in the Systems La2CuO4+ and La2-xSrxCuO4

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    Corresponding author: ZHOU Jian-Shi
  • 摘要: 本文解释了La2CuO4+(00.09)和La2-xSrxCuO4(0x0.3)两种p型系统含铜稀土氧化物中的电阻和Seebeck系数与温度的依赖关系,在室温以上,一氧大气压下的La2CuO4+系统趋于失氧;在500 K以上,超导样品显示出失氧的一级相变,并且恢复到反铁磁相。在转变温度T1300 K以下,对00.05成份的样品,相分离成反铁磁相和超导相;而在TcTT100 K的温度范围内,超导相进一步分离成富空穴和贫空穴畴。在0.040.09范围内,Tc处的电阻陡降出现了台阶;我们认为,它反映了电子成对的起伏。在La2-xSrxCuO4系统中,对于成分为0x0.2的样品,在T1300 K以上,空穴的运动是弥散的,但是Hm=0;而对于x0.22的样品,经历了从平滑到Fermi液态的转变。成份为0x0.12时,在TcTT1范围(其中空穴继续以弥散方式运动)是亚稳的,但是,在TcTT150 K范围,出现了电荷起伏。当样品冷却通过T1时,对于成份为0.15x0.2的样品,经历了由弥散到强质量增强巡游电子状态的转变;在Tc处,从均匀的修饰电子的正常态凝聚成超导的载流子对。在超导成份样品的正常态中,不寻常的电子-晶格相互作用,可以归结为在CuO2面上从更离子性的到共价性的Cu:3dx2-r2─O:P键合的转变;通过这种转变,轨道杂化和Hubbard U参量随Cu─O键长和Cu原子上的外表局域氧化态都产生灵敏的变化。

     

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出版历程
  • 收稿日期:  1992-09-21
  • 修回日期:  1992-09-21
  • 发布日期:  1993-06-05

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