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 . Magnetic field modulated microwave spectroscopy data confirms superconductivity with at least two distinct transition temperatures attributed to well-defined superconducting phases at K and K. Magnetometry data for the upper critical fields reveal a change in the magnetic order K) below and 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.
- Received 30 September 2016
- Revised 11 January 2018
DOI:https://doi.org/10.1103/PhysRevB.97.024516
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