Phase transition beneath the superconducting dome in BaFe[subscript 2](As[subscript 1-x]P[subscript x])[subscript 2]
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PhysRevB.92.081113.pdf
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Author(s)
Chowdhury, Debanjan
Orenstein, J.
Sachdev, Subir
Todadri, Senthil
Date Issued
August 2015
Journal
Physical Review B
Publisher
American Physical Society
Citation
Chowdhury, Debanjan, J. Orenstein, Subir Sachev, and T. Senthil. "Phase transition beneath the superconducting dome in BaFe[subscript 2](As[subscript 1-x]P[subscript x])[subscript 2]." Phys. Rev. B 92, 081113 (August 2015). © 2015 American Physical Society
Version
Final published version
Abstract
We present a theory for the large suppression of the superfluid density ρ[subscript s] in BaFe[subscript 2](As[subscript 1−x]P[subscript x])[subscript 2] in the vicinity of a putative spin-density wave quantum critical point at a P doping, x = x[subscript c]. We argue that the transition becomes weakly first order in the vicinity of x[subscript c], and disorder induces puddles of superconducting and antiferromagnetic regions at short length scales; thus, the system becomes an electronic microemulsion. We propose that frustrated Josephson couplings between the superconducting grains suppress ρ[subscript s]. In addition, the presence of “normal” quasiparticles at the interface of the frustrated Josephson junctions will give rise to a highly nontrivial feature in the low-frequency response in a narrow vicinity around x[subscript c]. We propose a number of experiments to test our theory.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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DOI of Published Version
https://doi.org/10.1103/PhysRevB.92.081113
