Interplay between tetragonal magnetic order, stripe magnetism, and superconductivity in iron-based materials

Article

关键词: HIGH-TEMPERATURE SUPERCONDUCTIVITY;    NEMATIC ORDER;   

DOI  :  10.1103/PhysRevB.91.121104

来源: SCIE

【 摘 要 】

Motivated by experiments in Ba1-x K-x Fe2As2 [A. E. Bohmer et al., arXiv:1412.7038], we analyze the type of spin-density wave (SDW) order in doped iron-pnictides and the discontinuities of the superconducting transition temperature T-c in the coexistence phase with SDW magnetism. We find a sequence of transitions, upon lowering the temperature, from the stripe-orthorhombic (C-2) SDW order to the tetragonal (C-4) order and then back to the C-2 order. We argue that T-c has two discontinuities-it jumps to a smaller value upon entering the coexistence region with the C-4 magnetic phase, and then jumps to a larger value inside the SDW state when it crosses the boundary between the C-4 and C-2 SDW orders. We argue that the agreement with the experimental phase diagram provides a strong indication that the itinerant approach is adequate for weakly/moderately doped iron pnictides.

【 授权许可】

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