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Title: Nematic superconductivity from selective orbital pairing in iron pnictide single crystals

Journal Article · · Cell Reports Physical Science

The discovery of iron-based superconductors proves that high-temperature superconductivity is not limited to cuprates. Here, we use transport measurements to determine the in-plane anisotropy of the upper critical field (Hc2) in detwinned superconducting Ba(Fe1-xMx)2As2 (M = Co, Ni) single crystals. In previous measurements on twinned single crystals, the charge carrier doping dependence of the Hc2 anisotropy for fields along inter-planar and in-plane directions was found to increase in the over-doped regime. For underdoped samples with a spin-nematic phase below the tetragonal-to-orthorhombic structural transition temperature, we find that Hc2 along the a axis is considerably lower than that along the b axis. This Hc2 anisotropy disappears in the over-doped regime when the system becomes tetragonal. By combining these results with previous works, we conclude that superconductivity in underdoped iron pnictides is orbital selective—with a dominant contribution from electrons with the dyz orbital character and from being intimately associated with spin excitations.

Research Organization:
Florida State Univ., Tallahassee, FL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE); Gordon and Betty Moore Foundation; National Science Foundation (NSF)
Grant/Contract Number:
SC0012311; SC0002613; GBMF9470; DMR-1644779
OSTI ID:
2287713
Alternate ID(s):
OSTI ID: 2317794
Journal Information:
Cell Reports Physical Science, Journal Name: Cell Reports Physical Science Vol. 5 Journal Issue: 2; ISSN 2666-3864
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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