On the nature of the second magnetization peak in FeSe 1x-x single crystals

D. Miu, T. Noji, T. Adachi, Y. Koike, L. Miu

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

The occurrence of the second peak (SP) on the dc magnetization curves of iron pnictide and chalcogenide single crystals (the fishtail effect) has been interpreted in surprisingly different ways, involving, for example, a thermally induced square-to-rhombic vortex lattice transition, a crossover between single vortex pinning in the low magnetic field range and pinning of interacting vortices at higher fields, or has been treated similarly to the peak effect close to the upper critical magnetic field. Here we show that the SP in FeSe 1xTe x single crystals is related to the well documented order-disorder transition in the vortex system, and its evolution in the low-temperature T domain is described by a dynamic energy balance relation. The main argument supporting this approach is the observed strong increase of the field for the onset of the SP with decreasing T down to 2K, with an inflection-like point located between 3 and 4K, in agreement with the two-band superconductivity reported for FeSe 1xTe x.

Original languageEnglish
Article number115009
JournalSuperconductor Science and Technology
Volume25
Issue number11
DOIs
Publication statusPublished - 2012 Nov 1

ASJC Scopus subject areas

  • Ceramics and Composites
  • Condensed Matter Physics
  • Metals and Alloys
  • Electrical and Electronic Engineering
  • Materials Chemistry

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