Phase diagram of superconductivity and antiferromagnetism in single crystals of Sr(Fe1−xCox)2As2 and Sr1−yEuy(Fe0.88Co0.12)2As2
Rongwei Hu, Sergey L. Bud’ko, Warren E. Straszheim, Paul C. Canfield
DOI 10.1103/PhysRevB.83.094520 · Physical Review B
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Abstract
We report magnetic susceptibility, resistivity, and heat capacity measurements on single crystals of the Sr(Fe1−xCox)2As2 and Sr1−yEuy(Fe0.88Co0.12)2As2 series. The optimal Co concentration for superconductivity in Sr(Fe1−xCox)2As2 is determined to be x~0.12. On the basis of this, we grew members of the Sr1−yEuy(Fe0.88Co0.12)2As2 series so as to examine the effects of well-defined, local magnetic moments on the superconducting state. We show that superconductivity is gradually suppressed by paramagnetic Eu2+ doping and coexists with antiferromagnetic ordering of Eu2+ as long as Tc>TN. For y⩾0.65, TN crosses Tc and the superconducting ground state (as manifested by zero resistivity) abruptly disappears with evidence for competition between superconductivity and local moment antiferromagnetism for y up to 0.72. It is speculated that the suppression of the antiferromagnetic fluctuations of the Fe sublattice by coupling to the long-range order of the Eu2+ sublattice destroys bulk superconductivity when TN>Tc.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Sr(Fe1-xCox)2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 14.8 | Pressure not reported | onset |
| Sr(Fe1-xCox)2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 14.5 | Pressure not reported | onset |
| Ba1-xKxFe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 37 | 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. | 22 | Pressure not reported | unknown |
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