Investigation of the heavy fermion state and superconductivity in Pr1 − xLaxOs4Sb12 by the upper critical field slope at Tc
Investigation of the heavy fermion state and superconductivity in Pr1 − xLaxOs4Sb12 by the upper critical field slope at Tc
复制标题
通过 Tc 时的上临界场斜率研究 Pr1 − xLaxOs4Sb12 中的重费米子态和超导性
DOI：
10.1088/0953-8984/22/34/345701
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发表时间：
2010
期刊：
影响因子：
--
通讯作者：
H. Tsujii
中科院分区：
文献类型：
--
作者：
B. Andraka;C. Rotundu;P. Kumar;H. Tsujii
用比热法测量了Pr1−xLaxOs4Sb12的Tc附近的上临界场Hc2。这些结果支持了PrOs4Sb12中m~*增强的非单离子起源假说，这一假说来自于对T_c处C/T不连续性的分析。这两组测量都表明存在一个交叉浓度，Xcr≈0.2-0.3，将重费米子类合金(x<；xcr)与正常金属(x>；xcr)分开。重费米子类合金在比热下表现出场诱导的长程反铁四极(AFQ)反常，而具有x>；xcr的重费米子合金则没有。在纯PrOs4Sb12上的不同测量中观察到的Hc2-T在T附近的曲率与样品和方法有关。
Measurements of the upper critical field Hc2 near Tc of Pr1 − xLaxOs4Sb12 were performed by specific heat. The results support the hypothesis of a non-single-ion origin of m* enhancement in PrOs4Sb12, derived from the analysis of the C/T discontinuity at Tc. Both sets of measurements indicate the existence of a crossover concentration, xcr≈0.2–0.3, separating heavy fermion-like alloys (x < xcr) from normal metals (x > xcr). Heavy fermion-like alloys exhibit field-induced long-range antiferro-quadrupolar (AFQ) anomalies in the specific heat, while those with x > xcr do not. The curvature in Hc2 versus T near Tc, observed in different measurements on pure PrOs4Sb12, is sample- and method-dependent.
影响因子：
3.7
作者：
Bauer, ED;Frederick, NA;Maple, MB
通讯作者：
Maple, MB