Anisotropic spin fluctuations and multiple superconducting gaps in hole-doped Ba 0.72 K 0.28 Fe 2 As 2 : NMR in a single crystal

2009/03/31 by K. Matano, G. L. Sun, Zheng Li +6 · 2 citations
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paper · pdf · doi:10.1209/0295-5075/87/27012

published as EPL 87 (2009) 27012

openalex publication_date 2009/07/01 · arxiv created 2009/08/18 · arxiv updated 2015/05/13 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05

Abstract

We report the 75 As-NMR study on a single crystal of the hole-doped iron-pnictide superconductor Ba 0.72 K 0.28 Fe 2 As 2 ( T c =31.5 K). We find that the Fe antiferromagnetic spin fluctuations are anisotropic and are weaker compared to underdoped copper-oxides or cobalt-oxide superconductors. The spin lattice relaxation rate 1/ T 1 decreases below T c with no coherence peak and shows a stepwise variation at low temperatures, which is indicative of multiple superconducting gaps, as in the electron-doped Pr(La)FeAsO 1- x F x . Furthermore, no evidence was obtained for a microscopic coexistence of a long-range magnetic order and superconductivity.

Citations

• As<mml:mprescripts/><mml:none/>75NMR Studies of SuperconductingLaFeAsO0.9F0.1
• Experimental consequences of thes-wavecos(kx)cos(ky)superconductivity in the iron pnictides
• Possible pairing states of the Fe-based superconductors
• Anisotropy of Superconducting Single Crystal SmFeAsO0.8F0.2 Studied by Torque Magnetometry
• S<mml:mprescripts/><mml:none/>123b-NQR study of unconventional superconductivity in the filled skutterudite heavy-fermion compoundPrOs4Sb12under high pressure up to 3.82 GPa
• Commensurate Itinerant Antiferromagnetism in BaFe2As2: 75As-NMR Studies on a Self-Flux Grown Single Crystal
• Unconventional Superconductivity and Electron Correlations in the Cobalt OxyhydrateNa0.35CoO2·yH2Ofrom Nuclear Quadrupole Resonance
• Hydration-induced anisotropic spin fluctuations in Na x CoO 2 · 1.3H 2 O superconductor
• Observation of Fermi-surface–dependent nodeless superconducting gaps in Ba 0.6 K 0.4 Fe 2 As 2
• Superconductivity at 38 K in the Iron Arsenide(Ba1−xKx)Fe2As2

Cited by

• Doping dependence of spin fluctuations and electron correlations in iron pnictides
• Observation of multiple superconducting gaps in the infrared reflectivity spectra of Ba(Fe0.9Co0.1)2As2