NMR evidence for field-induced ferromagnetism in (Li0.8Fe0.2)OHFeSe superconductor

Y. P. Wu; D. Zhao; X. R. Lian; X. F. Lu; N. Z. Wang; X. G. Luo; X. H. Chen; T. Wu

doi:10.1103/PhysRevB.91.125107

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NMR evidence for field-induced ferromagnetism in (Li0.8Fe0.2)OHFeSe superconductor

Y. P. Wu, D. Zhao, X. R. Lian, X. F. Lu, N. Z. Wang, X. G. Luo, X. H. Chen, T. Wu

DOI 10.1103/PhysRevB.91.125107 · Physical Review B

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Abstract

We report on Li7 and Se77 nuclear magnetic resonance (NMR) measurements in the newly discovered iron-based superconductor (Li0.8Fe0.2)OHFeSe. Both remarkable change in spectrum and divergence of spin-spin relaxation (T2) are observed with decreasing temperature, suggesting a static magnetic ordering in this material. Moreover, the broadened Li7 spectrum also shows a characteristic three-peak structure. Comparison of linewidth between Li7 and Se77 spectra indicates that there is a ferromagnetic component along the external field direction and it happens on Fe sites in the (Li0.8Fe0.2)OH layer rather than the FeSe layer, which is also responsible for the three-peak structure of the Li7 spectrum with (Li0.8Fe0.2) random occupation. The field-dependent spectrum and T2 suggest that the above ferromagnetic component is induced by external magnetic field. Our present results indicate that the superconductivity in (Li0.8Fe0.2)OHFeSe is very robust against the observed field-induced ferromagnetism and both of them could coexist under external magnetic field.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
(Li0.8Fe0.2)OHFeSe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	34	Pressure not reported	onset
(Li0.8Fe0.2)OHFeSe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	43	Pressure not reported	unknown
FeSe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	8	Pressure not reported	unknown
FeSe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	65	Pressure not reported	unknown