Coexistence of Cluster Spin Glass and Superconductivity in Ba(Fe1−xCox)2As2 for 0.060≤x≤0.071

A. P. Dioguardi; J. Crocker; A. C. Shockley; C. H. Lin; K. R. Shirer; D. M. Nisson; M. M. Lawson; N. apRoberts-Warren; P. C. Canfield; S. L. Bud’ko; S. Ran; N. J. Curro

doi:10.1103/PhysRevLett.111.207201

Coexistence of Cluster Spin Glass and Superconductivity in Ba(Fe1−xCox)2As2 for 0.060≤x≤0.071

A. P. Dioguardi, J. Crocker, A. C. Shockley, C. H. Lin, K. R. Shirer, D. M. Nisson, M. M. Lawson, N. apRoberts-Warren, P. C. Canfield, S. L. Bud’ko, S. Ran, N. J. Curro

DOI 10.1103/PhysRevLett.111.207201 · Physical Review Letters

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Abstract

We present As75 nuclear magnetic resonance data from measurements of a series of Ba(Fe1−xCox)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.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
LaFeAsO1-xFx Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	43	Pressure not reported	unknown
Ba(Fe1-xCox)2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown