Publication Date:
2016-02-25
Description:
Two distinct superconducting (SC) domes were discovered in the phase diagram of P-doped iron pnictide superconductors LaFeAs 1− x P x O with x ranging from 0 to 1. The first SC dome is centered around x = 0.3 and then disappears as P content increases to x = 0.5. For x 〉 0.5, a second SC dome appears, and T c reaches another maximum at x = 0.7. Although the maximum of T c in the two domes is close to each other, the estimated upper critical field ( H c 2 ) is much larger in the first SC dome, implying a difference in the nature between the two SC domes. Further band calculations and thermopower measurements suggest that there could be a Lifshitz transition in the electronic structure between the two SC domes.
Print ISSN:
0021-8979
Electronic ISSN:
1089-7550
Topics:
Physics
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