Anisotropic upper critical field and a possible Fulde-Ferrel-Larkin-Ovchinnikov state in a stoichiometric pnictide superconductor LiFeAs

Abstract

Measurements of the temperature and angular dependencies of the upper critical fields $H_{c2}$ of a stoichiometric single crystal LiFeAs in pulsed magnetic fields up to 50 T were performed using a tunnel diode resonator. Full $H_{c2}^{\parallel c}(T)$ and $H_{c2}^{\perp c}(T)$ curves with $H_{c2}^{\parallel c}(0)=17\pm 1$ T, $H_{c2}^{\perp c}(0)=26\pm 1$ T, and the anisotropy parameter ${\gamma }_H(T)\equiv H_{c2}^{\perp c}/H_{c2}^{\parallel c}$ decreasing from $\approx 2.5$ at $T_c$ to 1.5 at $T\ll T_c$ were observed. The results for both orientations are in excellent agreement with a theory of $H_{c2}$ for two-band $s^{\pm }$ pairing in the clean limit. We show that $H_{c2}^{\parallel c}(T)$ is mostly limited by the orbital pairbreaking, whereas the shape of $H_{c2}^{\perp c}(T)$ indicates strong paramagnetic Pauli limiting and the inhomogeneous Fulde-Ferrel-Larkin-Ovchinnikov (FFLO)state below $T_F\sim 5$ K.

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