Anisotropic upper critical field and possible Fulde-Ferrel-Larkin-Ovchinnikov state in the stoichiometric pnictide superconductor LiFeAs
K. Cho, H. Kim, M. A. Tanatar, Y. J. Song, Y. S. Kwon, W. A. Coniglio, C. C. Agosta, A. Gurevich, R. Prozorov
DOI 10.1103/PhysRevB.83.060502 · Physical Review B
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Abstract
Measurements of the temperature and angular dependencies of the upper critical field Hc2 of a stoichiometric single crystal LiFeAs in pulsed magnetic fields up to 50 T were performed using a tunnel diode resonator. Complete Hc2∥c(T) and Hc2⊥c(T) functions with Hc2∥c(0)=17±1 T, Hc2⊥c(0)=26±1 T, and the anisotropy parameter γH(T)≡Hc2⊥c/Hc2∥c decreasing from 2.5 at Tc to 1.5 at T≪Tc were obtained. The results for both orientations are in excellent agreement with a theory of Hc2 for two-band s± pairing in the clean limit. We show that Hc2∥c(T) is mostly limited by the orbital pair breaking, whereas the shape of Hc2⊥c(T) indicates strong paramagnetic Pauli limiting and the inhomogeneous Fulde-Ferrel-Larkin-Ovchinnikov state below TF~5 K.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| LiFeAs Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 17.6 | Pressure unresolved | unknown |
| LiFeAs Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 17.6 | Pressure unresolved | unknown |
| LaFePO Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 5.6 | Pressure not reported | unknown |
| KFe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 3 | Pressure not reported | unknown |
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