Strong Pauli-limiting behavior of H_(c2) and uniaxial pressure dependencies in KFe_2As_2

P. Burger; F. Hardy; D. Aoki; A. E. Boehmer; R. Eder; R. Heid; T. Wolf; P. Schweiss; R. Fromknecht; M. J. Jackson; C. Paulsen; C. Meingast

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Strong Pauli-limiting behavior of H_(c2) and uniaxial pressure dependencies in KFe_2As_2

机译：H_（c2）的强Pauli限制行为和KFe_2As_2中的单轴压力依赖性

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KFe_2As_2 single crystals are studied using specific-heat, high-resolution thermal-expansion, magnetization, and magnetostriction measurements. The magnetization and magnetostriction data provide clear evidence for strong Pauli-limiting effects of the upper critical field for magnetic fields parallel to the FeAs planes, suggesting that KFe_2As_2 may be a good candidate to search for the Fulde-Ferrell-Larkin-Ovchinnikov state. Using standard thermodynamic relations, the uniaxial pressure derivatives of the critical temperature T_c, the normal-state Sommerfeld coefficient γ_a, the normal-state susceptibility X, and the thermodynamic critical field H_c are calculated from our data. We find that the close relationship between doping and pressure as found in other Fe-based systems does not hold for KFe_2As_2.

机译：使用比热，高分辨率热膨胀，磁化和磁致伸缩测量研究了KFe_2As_2单晶。磁化和磁致伸缩数据为平行于FeAs平面的磁场的上临界场的强Pauli限制效应提供了清晰的证据，这表明KFe_2As_2可能是搜索Fulde-Ferrell-Larkin-Ovchinnikov状态的良好候选者。使用标准的热力学关系，根据我们的数据计算出临界温度T_c，常态Sommerfeld系数γ_a，常态磁化率X和热力学临界场H_c的单轴压力导数。我们发现，在其他基于铁的系统中发现的掺杂与压力之间的紧密关系并不适用于KFe_2As_2。

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《Physical review》 |2013年第1期|014517.1-014517.8|共8页
作者
P. Burger; F. Hardy; D. Aoki; A. E. Boehmer; R. Eder; R. Heid; T. Wolf; P. Schweiss; R. Fromknecht; M. J. Jackson; C. Paulsen; C. Meingast;
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Institut fuer Festkoerperphysik, Karlsruher Institut fuer Technologie, 76021 Karlsruhe, Germany,Fakultaet fuer Physik, Karlsruher Institut fuer Technologie, 76131 Karlsruhe, Germany;

Institut fuer Festkoerperphysik, Karlsruher Institut fuer Technologie, 76021 Karlsruhe, Germany;

INAC, SPSMS, CEA Grenoble, 38054 Grenoble, France,IMR, Tohoku University, Oarai, Ibaraki 311-1313, Japan;

Institut fuer Festkoerperphysik, Karlsruher Institut fuer Technologie, 76021 Karlsruhe, Germany,Fakultaet fuer Physik, Karlsruher Institut fuer Technologie, 76131 Karlsruhe, Germany;

Institut fuer Festkoerperphysik, Karlsruher Institut fuer Technologie, 76021 Karlsruhe, Germany;

Institut fuer Festkoerperphysik, Karlsruher Institut fuer Technologie, 76021 Karlsruhe, Germany;

Institut fuer Festkoerperphysik, Karlsruher Institut fuer Technologie, 76021 Karlsruhe, Germany;

Institut fuer Festkoerperphysik, Karlsruher Institut fuer Technologie, 76021 Karlsruhe, Germany;

Institut fuer Festkoerperphysik, Karlsruher Institut fuer Technologie, 76021 Karlsruhe, Germany;

Institut Neel, CNRS and Universite Joseph Fourier, BP 166,38042 Grenoble Cedex 9, France;

Institut Neel, CNRS and Universite Joseph Fourier, BP 166,38042 Grenoble Cedex 9, France;

Institut fuer Festkoerperphysik, Karlsruher Institut fuer Technologie, 76021 Karlsruhe, Germany;

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正文语种 eng
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关键词
thermodynamic properties; pressure effects;

机译：热力学性质;压力效应;

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Strong Pauli-limiting behavior of H_(c2) and uniaxial pressure dependencies in KFe_2As_2

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