Microscopic Coexistence of Superconductivity and Antiferromagnetism in Underdoped Ba(Fe1−xRux)2As2
Long Ma, G. F. Ji, Jia Dai, X. R. Lu, M. J. Eom, J. S. Kim, B. Normand, Weiqiang Yu
DOI 10.1103/PhysRevLett.109.197002 · Physical Review Letters
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Abstract
We use As75 nuclear magnetic resonance to investigate the local electronic properties of Ba(Fe1−xRux)2As2 (x=0.23). We find two phase transitions: to antiferromagnetism at TN≈60 K and to superconductivity at TC≈15 K. Below TN, our data show that the system is fully magnetic, with a commensurate antiferromagnetic structure and a moment of 0.4μB/Fe. The spin-lattice relaxation rate 1/T175 is large in the magnetic state, indicating a high density of itinerant electrons induced by Ru doping. On cooling below TC, 1/T175 on the magnetic sites falls sharply, providing unambiguous evidence for the microscopic coexistence of antiferromagnetism and superconductivity.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Ba(Fe0.77Ru0.23)2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 15 | Pressure not reported | zero_resistance |
| Ba(Fe0.77Ru0.23)2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 15 | Pressure not reported | onset |
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