Reentrant phases in electron-doped EuFe2As2: Spin glass and superconductivity

A. Baumgartner, D. Neubauer, S. Zapf, A. V. Pronin, W. H. Jiao, G. H. Cao, and M. Dressel
Phys. Rev. B 95, 174522 – Published 30 May 2017

Abstract

We report evidence for a reentrant spin glass phase in electron-doped EuFe2As2 single crystals and first traces of the superconductivity reentrance in optics. In the close-to-optimal doped Eu(Fe0.91Ir0.09)2As2 and Eu(Fe0.93Rh0.07)2As2 samples, two magnetic transitions are observed below the superconducting critical temperature Tc21 K: the canted A-type antiferromagnetic order of the Eu2+ ions sets in around 17K and the spin glass behavior occurs another 2K lower in temperature. In addition, strong evidence for an additional transition is found far below the spin glass temperature. Our extensive optical and magnetic investigations provide important insight into the interplay of local magnetism and superconductivity in these systems and elucidate the effect of the spin glass phase on the reentrant superconducting state.

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  • Received 13 February 2017
  • Revised 27 April 2017

DOI:https://doi.org/10.1103/PhysRevB.95.174522

©2017 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

A. Baumgartner1, D. Neubauer1, S. Zapf1, A. V. Pronin1, W. H. Jiao2, G. H. Cao2,3, and M. Dressel1

  • 11. Physikalisches Institut, Universität Stuttgart, Pfaffenwaldring 57, 70550 Stuttgart, Germany
  • 2Department of Physics, Zhejiang University, Hangzhou 310027, China
  • 3Collaborative Innovation Center of Advanced Microstructures, Nanjing 210093, China

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Vol. 95, Iss. 17 — 1 May 2017

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