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Urban, Christian; Valmianski, Ilya; Pachmayr, Ursula; Basaran, Ali C.; Johrendt, Dirk; Schuller, Ivan K. (2018): Coexistence of multiphase superconductivity and ferromagnetism in lithiated iron selenide hydroxide [(Li1-xFex) OH]FeSe. In: Physical Review B, Vol. 97, No. 2, 24516
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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 [(Li1-xFex) OH] FeSe. Magnetic field modulated microwave spectroscopy data confirms superconductivity with at least two distinct transition temperatures attributed to well-defined superconducting phases at T-SC1 = 40 +/- 2 K and T-SC2 = 35 +/- 2 K. Magnetometry data for the upper critical fields reveal a change in the magnetic order (T-M = 12 K) below T-SC1 and T-SC2 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.