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首页> 外文期刊>Physical review >NMR and NQR study of pressure-induced superconductivity and the origin of critical-temperature enhancement in the spin-ladder cuprate Sr_2Ca_(12)Cu_(24)O_(41)
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NMR and NQR study of pressure-induced superconductivity and the origin of critical-temperature enhancement in the spin-ladder cuprate Sr_2Ca_(12)Cu_(24)O_(41)

机译:旋压杯状Sr_2Ca_(12)Cu_(24)O_(41)的压力诱导超导和临界温度增强起因的NMR和NQR研究

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摘要

Pressure-induced superconductivity was studied for a spin-ladder cuprate Sr_2Ca_(12)Cu_(24)O_(41) using nuclear magnetic resonance under pressures up to the optimal pressure 3.8 GPa. Pressure application leads to a transitional change from a spin-gapped state to a Fermi-liquid state at temperatures higher than T_c. The relaxation rate 1 / T_1 shows activated-type behavior at an onset pressure, whereas Korringa-like behavior becomes predominant at the optimal pressure, suggesting that an increase in the density of states at the Fermi energy leads to enhancement of T_c. Nuclear quadrupole resonance spectra suggest that pressure application causes transfer of holes from the chain to the ladder sites. The transfer of holes increases DOS below the optimal pressure. A dome-shaped T_c versus pressure curve arises from naive balance between the transfer of holes and broadening of the band width.
机译:在高达3.8 GPa的最佳压力下,利用核磁共振技术研究了旋转梯形铜酸盐Sr_2Ca_(12)Cu_(24)O_(41)的压力诱导超导性。施加压力导致在高于T_c的温度下从自旋隙态到费米液态的过渡变化。松弛率1 / T_1在起始压力下显示活化型行为,而在最佳压力下类似Korringa的行为占主导地位,这表明费米能量处的态密度增加导致T_c增强。核四极共振谱表明,施加压力会导致空穴从链转移到梯形部位。空穴的转移使DOS降低到最佳压力以下。圆顶形的T_c与压力的关系曲线是由空穴传输和带宽扩展之间的天真平衡引起的。

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  • 来源
    《Physical review》 |2009年第10期|100503.1-100503.4|共4页
  • 作者单位

    Graduate School of Human and Environmental Studies, Kyoto University, Yoshida-Nihonmatsu-cyo, Sakyo-ku, Kyoto 606-8501, Japan;

    Department of Superconductivity, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan;

    Department of Superconductivity, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan;

    Institute for Solid State Physics, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8581, Japan;

    Institute for Solid State Physics, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8581, Japan National Institute for Materials Science, Tsukuba 305-0047, Japan;

    Institute for Solid State Physics, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8581, Japan;

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  • 正文语种 eng
  • 中图分类
  • 关键词

    magnetic properties; pressure effects; other cuprates, including Tl and Hg-based cuprates;

    机译:磁性压力影响;其他铜价;包括基于Tl和Hg的铜价;

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