Evolution of the Phase Diagram of LaFeP_1-xAs_xO_1-yF_y (y = 0 -- 0.1)

2014/08/04 by K. T. Lai, A. Takemori, S. Miyasaka +3 · 1 citation
Physics and Astronomy · #cond-mat.supr-con

paper · pdf · doi:10.1103/physrevb.90.064504

published as Phys. Rev. B 90, 064504 (2014) · accepted by PRB

arxiv created 2014/08/04 · arxiv updated 2014/08/13

Abstract

P/As-substitution effects on the transport properties of polycrystalline LaFeP_1-xAs_xO_1-yF_y with x = 0 -- 1.0 and y = 0 -- 0.1 have been studied. In the F-free samples (y = 0), a new superconducting (SC) dome with a maximum T_c of 12 K is observed around x = 0 -- 0.3. This is separated from another SC dome with T_c ∼10 K at x = 0.6 -- 0.8 by an antiferromagnetic region (x = 0.3 -- 0.6), giving a two-dome feature in the T_c-x phase diagram. As y increases, the two SC domes merge together, changing to a double peak structure at y = 0.05 and a single dome at y = 0.1. This proves the presence of two different Fermi surface states in this system.

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