Coexistence of Cluster Spin Glass and Superconductivity in Ba(Fe_1-xCo_x)2)As₂ for 0.060 ≤ X ≤ 0.071

Journal Article · Tue Nov 12 00:00:00 EST 2013 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.111.207201· OSTI ID:1134143

Dioguardi, A. P. ^[1]; Crocker, J. ^[1]; Shcokley, A. C. ^[1]; Lin, C. H. ^[1]; Shirer, K. R. ^[1]; Nisson, D. M. ^[1]; Lawson, M. M. ^[1]; Roberts-Warren, N. ^[1]; Canfield, Paul C. ^[2]; Budko, Sergey L. ^[2]; Ran, Sheng ^[2]; Curro, N. J. ^[1]

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1. University of California
2. Ames Laboratory

We present ⁷⁵As nuclear magnetic resonance data from measurements of a series of Ba(Fe_1-xCo_x)₂As₂ crystals with 0.00≤x≤0.075 that reveals the coexistence of frozen antiferromagnetic domains and superconductivity for 0.060≤x≤0.071. Although bulk probes reveal no long range antiferromagnetic order beyond x=0.06, we find that the local spin dynamics reveal no qualitative change across this transition. The characteristic domain sizes vary by more than an order of magnitude, reaching a maximum variation at x=0.06. This inhomogeneous glassy dynamics may be an intrinsic response to the competition between superconductivity and antiferromagnetism in this system.

• Research Organization: Ames Lab., Ames, IA (United States)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: DE-AC02-07CH11358
• OSTI ID: 1134143
• Report Number(s): IS-J 8209
• Journal Information: Physical Review Letters, Vol. 111; ISSN 0031-9007
• Publisher: American Physical Society (APS)
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE