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首页> 外文期刊>Physica, C. Superconductivity and its applications >CU-63 NMR AND NQR STUDIES OF HIGH-T-C CUPRATES UNDER PRESSURE
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CU-63 NMR AND NQR STUDIES OF HIGH-T-C CUPRATES UNDER PRESSURE

机译：加压下高T-C化合物的CU-63 NMR和NQR研究

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The spin-lattice relaxation rate 1/T-1 and the Knight shift were measured for La1.85Sr0.15CuO4 and YBa2Cu4O8 under pressure to 1.4 GPa. The results together with the previously reported pressure dependence of the nuclear quadrupole frequency, nu(Q), give evidence that the local hole distribution changes under pressure. In La1.85Sr0.15CuO4, the hole density in the Cu 3d orbit decreases, accompanying a suppression of the antiferromagnetic spin fluctuation of the low-energy component. In YBa2Cu4O8, by contrast, the spin fluctuation changes little while the total hole number in the CuO2 plane increases. We argue that such changes in the hole distribution are responsible for the T-c increase in the respective compounds. We also found that the so-called ''spin-gap'' behavior in YBa2Cu4O8 becomes more pronounced under pressure. [References: 24]
机译：在压力为1.4 GPa的条件下，对La1.85Sr0.15CuO4和YBa2Cu4O8测量了自旋晶格弛豫速率1 / T-1和奈特位移。结果与先前报道的核四极子频率nu（Q）的压力相关性一起提供了证据，表明在压力下局部孔分布发生了变化。在La1.85Sr0.15CuO4中，伴随着低能量成分的反铁磁自旋波动的抑制，Cu 3d轨道中的空穴密度降低。相反，在YBa2Cu4O8中，自旋涨落变化不大，而CuO2平面中的总孔数增加。我们认为，空穴分布的这种变化是相应化合物中T-c增加的原因。我们还发现，YBa2Cu4O8中的所谓“自旋间隙”行为在压力下变得更加明显。 [参考：24]

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