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Coupling of electronic and magnetic properties in Fe_(1+y)(Te_(1-x)Se_x)

机译：Fe_（1 + y）（Te_（1-x）Se_x）中的电子和磁性耦合

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摘要

We have studied the coupling of electronic and magnetic properties in Fe_(1+y)(Te_(1-x)Se_x) via systematic specific heat, magnetoresistivity (MR), and Hall coefficient measurements on two groups of samples with y ＝ 0.02 and 0.1. In the y ＝ 0.02 series, we find that the 0.09 ＜ x ＜ 0.3 composition region, where superconductivity is suppressed, has a large Sommerfeld coefficient γ (～55-65 mJ/mol K~2), positive Hall coefficient R_H, and negative MR at low temperature, in sharp contrast with the x ＝ 0.4-0.5 region, where γ drops to ～26 mJ/mol K~2 and R_H and MR become negative and positive, respectively, at low temperature. Dramatic changes of γ, as well as sign reversal in low-temperature R_H and MR, are also observed across the x ～ 0.1 boundary, where the long-range antiferromagnetic order is suppressed. However, for the system with rich interstitial excess Fe (y ＝ 0.1), where bulk superconductivity is suppressed even for x ＝ 0.4-0.5, the variations of γ, R_H, and MR with x are distinct from those seen in y ＝ 0.02 system: γ is ～40 mJ/mol K~2 for 0.1 ＜ x ＜ 0.3 and drops to ～34 mJ/mol K~2 for x ＝ 0.4-0.5; R_H and MR do not show any sign reversal as x is increased above 0.3. We will show that all these results can be understood in light of the evolution of the incoherent magnetic scattering by (π,0) magnetic fluctuations with Se concentration. In addition, with the suppression of magnetic scattering by the magnetic field, we observed the surprising effect of a remarkable increase in the superconducting volume fraction under moderate magnetic fields for x ＝ 0.3-0.4 samples in the y ＝ 0.02 system.
机译：我们通过系统比热，磁电阻率（MR）和霍尔系数测量两组y ＝ 0.02和1.的Fe_（1 + y）（Te_（1-x）Se_x）中的电磁性质进行了研究。 0.1。在y ＝ 0.02系列中，我们发现超导性受到抑制的0.09 ＜x ＜0.3组成区域具有大的Sommerfeld系数γ（〜55-65 mJ / mol K〜2），正霍尔系数R_H，负低温下的MR与x ＝ 0.4-0.5区域形成鲜明对比，其中γ降至〜26 mJ / mol K〜2，而低温下R_H和MR分别变为负和正。在x〜0.1边界上，还观察到γ的剧烈变化以及低温R_H和MR中的符号反转，从而抑制了远距离反铁磁序。但是，对于具有丰富的间隙多余Fe（y ＝ 0.1）的系统，即使x ＝ 0.4-0.5，体超导性也受到抑制，γ，R_H和MR随x的变化与y ＝ 0.02中的变化明显：对于0.1 ＜x ＜0.3，γ为〜40 mJ / mol K〜2；对于x ＝ 0.4-0.5，γ降至〜34 mJ / mol K〜2；当x增加到0.3以上时，R_H和MR不会显示任何符号反转。我们将显示，根据非相干磁散射的演变，以及由Se浓度引起的（π，0）磁涨落，我们可以理解所有这些结果。此外，在磁场抑制磁散射的情况下，我们观察到了令人惊讶的效果：在y ＝ 0.02系统中，x ＝ 0.3-0.4的样品在中等磁场下超导体积分数显着增加。

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  • 来源
    《Physical review》 |2013年第9期|094505.1-094505.13|共13页
  • 作者

    J. Hu; T. J. Liu; B. Qian; Z. Q. Mao;

  • 作者单位

    Department of Physics and Engineering Physics, Tulane University, New Orleans, Louisiana 70118, USA;

    Department of Physics and Engineering Physics, Tulane University, New Orleans, Louisiana 70118, USA;

    Department of Physics and Engineering Physics, Tulane University, New Orleans, Louisiana 70118, USA;

    Department of Physics and Engineering Physics, Tulane University, New Orleans, Louisiana 70118, USA;

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  • 正文语种 eng
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  • 关键词

    thermodynamic properties; magnetic properties;

    机译：热力学性质;磁性;

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