科研之友
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摘要
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 T-c = 30 K. The B-c2-T-c phase diagram has been constructed in a wide temperature range with a minimum temperature of 1.6 K (approximate to 0.05 x T-c), for both B parallel to ab (B-c2(ab)) and B parallel to c (B-c2(c)). The upper critical fields B-c2(ab)(0) and B-c2(c) (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 T-c. The small B-c2(0) values and the B-c2(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.
- 出版日期2011-3-8
