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Vortex creep down to 0.3 K in superconducting Fe(Te,Se) single crystals

机译:Fe(Te,Se)超导单晶中的涡旋蠕变降至0.3 K

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摘要

We report on a study of the vortex creep in Fe_(1+δ)(Te_xSe_(1-x)) single crystals (x = 0.5 and 0.4) down to 0.28 K (~T_c/50) and up to μ_0H_a = 2T. The relaxation of the current density [J(t)] has been measured during 20 hours and the decay of J(t) can be well described by a J(t) ∝ [In(t/t_0)]~(-1/μ) law. We show that the relaxation exponent μ tends towards 0 for T < 2K and μ_0H_a < 0.1T [i.e. J(t) → (t_0/t)~α] and increases for increasing T and/or H_a. Our measurements strongly suggest that the logarithmic creep rate R = -d ln{J)/d ln(t) remains finite at zero temperature (R_(∣t→0) → 2%) and hence that quantum creep plays a dominant role in the relaxation process at low temperature. A maximum is observed in both the temperature and field dependence of R(t = 100s, T, H_a), which can be associated to a crossover from a single vortex (one-dimensional) to a bundle (three-dimensional) creep regime.
机译:我们报告了对Fe_(1 +δ)(Te_xSe_(1-x))单晶(x = 0.5和0.4)低至0.28 K(〜T_c / 50)和μ_0H_a= 2T的涡旋蠕变的研究。电流密度[J(t)]的弛豫已在20小时内进行了测量,并且J(t)的衰减可以通过J(t)∝ [In(t / t_0)]〜(-1 / μ)法则。我们发现对于T <2K和μ_0H_a<0.1T,弛豫指数μ趋于0 [即。 J(t)→(t_0 / t)〜α]并随着T和/或H_a的增加而增加。我们的测量结果强烈表明,对数蠕变速率R = -d ln {J)/ d ln(t)在零温度下(R_(∣t→0)→2%)仍然是有限的,因此量子蠕变起着主导作用。低温下的松弛过程。 R(t = 100s,T,H_a)的温度和场依赖性都达到最大值,这可能与从单个涡旋(一维)到束(三维)蠕变状态的转换有关。

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  • 来源
    《Physical review》 |2014年第1期|014514.1-014514.6|共6页
  • 作者单位

    Universite de Grenoble-Alpes, Inst NEEL, F-38042 Grenoble, France and CNRS, Inst NEEL, F-38042 Grenoble, France;

    Universite de Grenoble-Alpes, Inst NEEL, F-38042 Grenoble, France and CNRS, Inst NEEL, F-38042 Grenoble, France;

    Universite de Grenoble-Alpes, Inst NEEL, F-38042 Grenoble, France and CNRS, Inst NEEL, F-38042 Grenoble, France;

    Universite de Grenoble-Alpes, Inst NEEL, F-38042 Grenoble, France and CNRS, Inst NEEL, F-38042 Grenoble, France;

    SPSMS, UMR-E9001, CEA-INAC/ UJF-Grenoble 1, 17 Rue des Martyrs, 38054 Grenoble, France;

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