Upper critical field of the pressure-induced superconductor EuFe2As2
Nobuyuki Kurita, Motoi Kimata, Kota Kodama, Atsushi Harada, Megumi Tomita, Hiroyuki S. Suzuki, Takehiko Matsumoto, Keizo Murata, Shinya Uji, Taichi Terashima
DOI 10.1103/PhysRevB.83.100501 · Physical Review B
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Abstract
We have carried out high-field resistivity measurements up to 27 T in EuFe2As2 at P = 2.5 GPa, a virtually optimal pressure for the P-induced superconductivity, where Tc = 30 K. The Bc2−Tc phase diagram has been constructed in a wide temperature range with a minimum temperature of 1.6 K (≈0.05 × Tc), for both B ∥ ab (Bc2ab) and B ∥ c (Bc2c). The upper critical fields Bc2ab(0) and Bc2c(0), determined by the onset of resistive transitions, are 25 and 22 T, respectively, which are significantly smaller than those of other Fe-based superconductors with similar values of Tc. The small Bc2(0) values and the Bc2(T) curves with positive curvature around 20 K can be explained by a multiple pair-breaking model that includes the exchange field due to the magnetic Eu2+ moments. The anisotropy parameter, Γ=Bc2ab/Bc2c, in EuFe2As2 at low temperatures is comparable to that of other “122” Fe-based systems.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| EuFe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 30 | 2.5 GPa | zero_resistance |
| EuFe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 30 | 2.5 GPa | onset |
| LaFeAs(O,F) Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 26 | Pressure not reported | unknown |
| SrFe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 30 | 4.2 GPa | unknown |
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