The Vortex Glass-Liquid Transition in Fe1.02Se Crystal

¹G. Nadjakov Institute of Solid State Physics, Bulgarian Academy of Sciences, 72 Tzarigradsko Chaussee Blvd., Sofia, 1784, Bulgaria

²Department of Physics “E.R. Caianiello”, University of Salerno, Giovani Paolo II, 132, Salerno,  I-84084,
Italy & CNR-SPIN, C/o Giovani Paolo II, 132, I-84084 Fisciano (SA), Italy

³Leibniz Institute for Solid State and Materials Research, Helmholtz str.20, Dresden, D-01171, Germany

Adv. Mater. Lett., 2019, 10 (9), pp 627-632

DOI: 10.5185/amlett.2019.0010

Publication Date (Web): May 20, 2019

Copyright © IAAM-VBRI Press

E-mail: nazarova@issp.bas.bg

Abstract

The vortex-glass (VG) to vortex-liquid (VL) transition is studied in flux-grown Fe_1.02Se crystal with nanosized hexagonal phase inclusions. These non-superconducting impurities effectively pin the vortices and shift lightly the irreversibility line to higher fields and temperatures in comparison with single crystal. It is shown that the interplay between vortex pinning and thermal fluctuations enable the observation of VG-VL transition. The existence of this transition was proved by the scaling presentation of current-voltage characteristics at two different magnetic fields. The obtained scaling parameters are practically field independent. The values of the dynamic z exponent are in the range predicted by the VG model, while the values of static ν exponent are a little smaller. This is not considered as a lack of the universality of the model, but rather as a consequence of the type of pinning and special domain morphology of the crystal resembling the granularity in polycrystalline samples. © VBRI Press.

Keywords

superconductor, FeSe, vortex-glas to vortex-liquid transition.