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首页> 外文期刊>Physical review >Experimental and semiempirical method to determine the Pauli-limiting field in quasi-two-dimensional superconductors as applied to κ-(BEDT-TTF)_2Cu(NCS)_2: Strong evidence of a FFLO state
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Experimental and semiempirical method to determine the Pauli-limiting field in quasi-two-dimensional superconductors as applied to κ-(BEDT-TTF)_2Cu(NCS)_2: Strong evidence of a FFLO state

机译:确定适用于κ-(BEDT-TTF)_2Cu(NCS)_2的准二维超导体中保利极限场的实验和半经验方法:FFLO状态的有力证据

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摘要

We present upper critical field data for κ-(BEDT-TTF)_2Cu(NCS)_2 with the magnetic field close to parallel and parallel to the conducting layers. We show that we can eliminate the effect of vortex dynamics in these layered materials if the layers are oriented within 0.3° of parallel to the applied magnetic field. Eliminating vortex effects leaves one remaining feature in the data that corresponds to the Pauli paramagnetic limit (H_p). We propose a semiempirical method to calculate the H_p in quasi-2D superconductors. This method takes into account the energy gap of each of the quasi-2D superconductors, which is calculated from specific-heat data, and the influence of many-body effects. The calculated Pauli paramagnetic limits are then compared to critical field data for the title compound and other organic conductors. Many of the examined quasi-2D superconductors, including the above organic superconductors and CeCoIn_5, exhibit upper critical fields that exceed their calculated H_p suggesting unconventional superconductivity. We show that the high-field low-temperature state in κ-(BEDT-TTF)_2Cu(NCS)_2 is consistent with the Fulde-Ferrell-Larkin-Ovchinnikov state.
机译:我们提出了κ-(BEDT-TTF)_2Cu(NCS)_2的上临界场数据,其磁场接近平行且平行于导电层。我们表明,如果这些层的取向平行于所施加的磁场0.3°以内,则可以消除这些层状材料中涡旋动力学的影响。消除涡流效应会在数据中留下一个与保利顺磁极限(H_p)相对应的剩余特征。我们提出了一种半经验方法来计算准2D超导体中的H_p。该方法考虑了根据比热数据计算的每个准2D超导体的能隙,以及多体效应的影响。然后将计算出的保利顺磁极限与标题化合物和其他有机导体的临界场数据进行比较。许多检查过的准二维超导体,包括上述有机超导体和CeCoIn_5,都显示出超过其计算出的H_p的上限临界场,表明存在非常规的超导性。我们表明,κ-(BEDT-TTF)_2Cu(NCS)_2中的高场低温状态与Fulde-Ferrell-Larkin-Ovchinnikov状态一致。

著录项

  • 来源
    《Physical review》 |2012年第21期|p.214514.1-214514.9|共9页
  • 作者单位

    Physics Department, Clark University, 950 Main Street, Worcester, Massachusetts 01610, USA;

    Physics Department, Clark University, 950 Main Street, Worcester, Massachusetts 01610, USA;

    Physics Department, Clark University, 950 Main Street, Worcester, Massachusetts 01610, USA;

    Physics Department, Clark University, 950 Main Street, Worcester, Massachusetts 01610, USA;

    Physics Department, Clark University, 950 Main Street, Worcester, Massachusetts 01610, USA;

    Physics Department, Clark University, 950 Main Street, Worcester, Massachusetts 01610, USA;

    Physics Department, Clark University, 950 Main Street, Worcester, Massachusetts 01610, USA;

    National High Magnetic Field Laboratory, 1800 East Paul Dirac Drive, Tallahassee, Florida 32310, USA;

    National High Magnetic Field Laboratory, 1800 East Paul Dirac Drive, Tallahassee, Florida 32310, USA;

    National High Magnetic Field Laboratory, 1800 East Paul Dirac Drive, Tallahassee, Florida 32310, USA;

    Materials Science Division, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439, USA;

    The Royal Institution, 21 Albemarle Street, London W1X 4BS, United Kingdom;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    organic superconductors; superconductivity phase diagrams; inhomogeneous superconductors and superconducting systems;

    机译:有机超导体;超导相图;非均质超导体和超导系统;

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