Abrupt recovery of Fermi-liquid transport following the collapse of the c axis in CaFe2(As1-xPx)2 single crystals
Abrupt recovery of Fermi-liquid transport following the collapse of the c axis in CaFe2(As1-xPx)2 single crystals
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DOI：
10.1103/physrevb.83.060505
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发表时间：
2011-02-22
影响因子：
3.7
通讯作者：
Matsuda, Y.
中科院分区：
文献类型：
--
作者：
Kasahara, S.;Shibauchi, T.;Matsuda, Y.
发现CaFe_2（As_（1-x）Px）（2）单晶在T-cT小于或接近100 K（x > 0.05）时，表现出四氢（T）到四氢-四氢（cT）的转变。c轴在低于T-cT时收缩约9%，这大大减少了空穴和电子带之间的带间嵌套。与AFe（2）（As 1-xPx）（2）（A = Ba，Sr）的超导T相观察到异常的非费米液体输运性质形成鲜明对比，Ca基系统的电阻率、霍尔系数和磁电阻数据均表明，在T-cT以下，标准费米液体行为突然恢复，超导电性完全消失。超导电性和非费米液体输运的同时消失揭示了带间涨落对铁磷属元素化物超导电性的重要作用。
Single crystals of CaFe2(As1-xPx)(2) are found to exhibit the tetragonal (T) to collapsed-tetragonal (cT) transition at T-cT less than or similar to 100 K for x > 0.05. The c-axis shrinks by similar to 9% below T-cT, which substantially diminishes the interband nesting between the hole and electron bands. In sharp contrast to the superconducting T phase of AFe(2)(As1-xPx)(2) (A = Ba, Sr), where the anomalous non-Fermi liquid transport properties are observed, the resistivity, Hall coefficient, and magnetoresistance data in the Ca-based system all indicate that the standard Fermi liquid behaviors are recovered abruptly below T-cT, and the superconductivity disappears completely. The simultaneous disappearance of the superconductivity and the non-Fermi liquid transport enlightens the essential role of interband-associated fluctuations to the superconductivity in Fe pnictides.