Superconductivity in Ru-substituted polycrystalline BaFe2−xRuxAs2
Shilpam Sharma, A. Bharathi, Sharat Chandra, V. Raghavendra Reddy, S. Paulraj, A. T. Satya, V. S. Sastry, Ajay Gupta, C. S. Sundar
DOI 10.1103/PhysRevB.81.174512 · Physical Review B
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Abstract
The occurrence of bulk superconductivity at ∼22 K is reported in polycrystalline samples of BaFe2−xRuxAs2 for nominal Ru content in the range of x=0.75–1.125. A systematic suppression of the spin-density-wave transition temperature (TSDW) precedes the appearance of superconductivity in the system. A phase diagram is proposed based on the measured TSDW and superconducting transition temperature (TC) variations as a function of Ru composition. Band-structure calculations indicate introduction of electron carriers in the system upon Ru substitution. The calculated magnetic moment on Fe shows a minimum at x=1.0, suggesting that the suppression of the magnetic moment is associated with the emergence of superconductivity. Results of low-temperature and high-field Mössbauer measurements are presented. These indicate weakening of magnetic interaction with Ru substitution.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| BaFe2-xRuxAs2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 22 | Pressure not reported | onset |
| BaFe2-xRuxAs2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 20 | Pressure not reported | onset |
| Ba1-xKxFe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 38 | Pressure not reported | unknown |
| BaFe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 36 | Pressure not reported | unknown |
| BaFe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 29 | Pressure not reported | unknown |
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