Reentrant phases in electron-doped EuFe2As2: Spin glass and superconductivity
A. Baumgartner, D. Neubauer, S. Zapf, A. V. Pronin, W. H. Jiao, G. H. Cao, M. Dressel
DOI 10.1103/PhysRevB.95.174522 · Physical Review B
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Abstract
We report evidence for a reentrant spin glass phase in electron-doped EuFe2As2 single crystals and first traces of the superconductivity reentrance in optics. In the close-to-optimal doped Eu(Fe0.91Ir0.09)2As2 and Eu(Fe0.93Rh0.07)2As2 samples, two magnetic transitions are observed below the superconducting critical temperature Tc≈21 K: the canted A-type antiferromagnetic order of the Eu2+ ions sets in around 17K and the spin glass behavior occurs another 2K lower in temperature. In addition, strong evidence for an additional transition is found far below the spin glass temperature. Our extensive optical and magnetic investigations provide important insight into the interplay of local magnetism and superconductivity in these systems and elucidate the effect of the spin glass phase on the reentrant superconducting state.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Eu(Fe0.91Ir0.09)2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 21 | Pressure not reported | onset |
| Eu(Fe0.91Ir0.09)2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 18.9 | Pressure not reported | zero_resistance |
| Eu(Fe0.93Rh0.07)2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 19.6 | Pressure not reported | onset |
| Eu(Fe0.93Rh0.07)2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 9.1 | Pressure not reported | zero_resistance |
| LaFeAsO Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 26 | Pressure not reported | unknown |
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