Coexistence of multiphase superconductivity and ferromagnetism in lithiated iron selenide hydroxide [(Li1-xFex) OH]FeSe

Urban, Christian; Valmianski, Ilya; Pachmayr, Ursula; Basaran, Ali C.; Johrendt, Dirk and 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

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.

• Item Type: Journal article
• Faculties: Chemistry and Pharmacy > Department of Chemistry
• Subjects: 500 Science > 540 Chemistry
• ISSN: 2469-9950
• Language: English