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arXiv 1608.04263cond-mat.str-el
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层状化合物ZrAs1. 58 Se 0.39中As空位引起的双通道近藤物理

Two-channel Kondo physics due to As vacancies in the layered compound ZrAs1.58Se0.39

T. Cichorek, L. Bochenek, M. Schmidt, A. Czulucki, G. Auffermann, R. Kniep, F. Steglich, S. Kirchner

摘要:

我们解决的起源磁场独立的|A| T^{1/2}长期观察到的低温电阻率的几个As基金属系统的PbFCl结构类型。对于层状化合物ZrAs_{1.58} Se_{0.39},我们表明,在正方形网络中的空缺的As引起的低温输运异常在一个广泛的温度制度的近二十年的温度。这种低温行为符合双通道近藤效应的非磁性版本,其起源我们归因于动态Jahn-Teller效应在具有C_4对称性的空位携带As层中操作。As方网中动力学缺陷的破缺性质解释了ZrAs_{1.58} Se_{0.39}的超导转变温度T_{ \rm{c} } \approx为0.14 K,而无空位同系物ZrP_{1.54} S_{0.46}的T_{ \rm{c} } \approx为3.7 K.我们的研究结果应该是相关的一个广泛的类别的金属与无序氮族层。

英文摘要:

We address the origin of the magnetic-field independent -|A| T^{1/2} term observed in the low-temperature resistivity of several As-based metallic systems of the PbFCl structure type. For the layered compound ZrAs_{1.58}Se_{0.39}, we show that vacancies in the square nets of As give rise to the low-temperature transport anomaly over a wide temperature regime of almost two decades in temperature. This low-temperature behavior is in line with the non-magnetic version of the two-channel Kondo effect, whose origin we ascribe to a dynamic Jahn-Teller effect operating at the vacancy-carrying As layer with a C_4 symmetry. The pair-breaking nature of the dynamical defects in the square nets of As explains the low superconducting transition temperature T_{\rm{c}}\approx 0.14 K of ZrAs_{1.58}Se_{0.39}, as compared to the free-of-vacancies homologue ZrP_{1.54}S_{0.46} (T_{\rm{c}}\approx 3.7 K). Our findings should be relevant to a wide class of metals with disordered pnictogen layers.

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