High Magnetic Field Studies of Pressure-induced Superconductor EuFe2 As 2
Abstract
We have performed resistivity and susceptibility measurements of the pressure-induced superconductor EuFe 2 As 2 under high magnetic fields up to 27 T. The upper critical field Bc 2 and its pressure evolution up to 3.2 GPa were determined in a wide temperature range down to 1.6 K. At 2.5 GPa, nearly the optimal pressure with Tc = 30 K, Bc 2 (0) obtained by the onset of resistive transitions are 25 T and 22 T for B ∥ ab and B ∥ c , respectively, which are appreciably smaller than those for other Fe-based superconductors with similar Tc . The small Bc 2 (0) values and the peculiar Bc 2 (T) curves in EuFe 2 As 2 can be explained by a multiple pair-breaking model including the exchange field due to the magnetic Eu 2+ moments. We will also present the results of quantum oscillations observed above the optimal pressure.
- Publication:
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APS March Meeting Abstracts
- Pub Date:
- March 2011
- Bibcode:
- 2011APS..MARW26006K