Coexistence of multiphase superconductivity and ferromagnetism in lithiated iron selenide hydroxide [(Li1xFex)OH]FeSe

Christian Urban, Ilya Valmianski, Ursula Pachmayr, Ali C. Basaran, Dirk Johrendt, and Ivan K. Schuller
Phys. Rev. B 97, 024516 – Published 25 January 2018

Abstract

We present experimental evidence for (a) multiphase superconductivity and (b) coexistence of magnetism and superconductivity in a single structural phase of lithiated iron selenide hydroxide [(Li1xFex)OH]FeSe. Magnetic field modulated microwave spectroscopy data confirms superconductivity with at least two distinct transition temperatures attributed to well-defined superconducting phases at TSC1=40±2 K and TSC2=35±2 K. Magnetometry data for the upper critical fields reveal a change in the magnetic order (TM=12 K) below TSC1 and TSC2 that is consistent with ferromagnetism. This occurs because the superconducting coherence length is much smaller than the structural coherence length, allowing for several different electronic and magnetic states on a single crystallite. The results give insight into the physics of complex multinary materials, where several phenomena governed by different characteristic length scales coexist.

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  • Received 30 September 2016
  • Revised 11 January 2018

DOI:https://doi.org/10.1103/PhysRevB.97.024516

©2018 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Christian Urban1, Ilya Valmianski1, Ursula Pachmayr2, Ali C. Basaran1, Dirk Johrendt2, and Ivan K. Schuller1

  • 1Department of Physics and Center for Advanced Nanoscience, University of California, San Diego, La Jolla, California 92093, USA
  • 2Department of Chemistry, Ludwig-Maximilians-Universitaet Muenchen, D-81377, Munich, Germany

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Issue

Vol. 97, Iss. 2 — 1 January 2018

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