Superconductivity in Ru substituted BaFe2-xRuxAs2
Shilpam Sharma, A. Bharathi, Sharat Chandra, Raghavendra Reddy, S., Paulraj, A. T. Satya, V. S. Sastry, Ajay Gupta, C. S. Sundar
TL;DR
This study reports bulk superconductivity at ~22 K in BaFe2-xRuxAs2 with Ru substitution, showing suppression of magnetic order and electron doping effects, supported by experimental and band structure calculations.
Contribution
It provides a systematic phase diagram of Ru substitution effects and links magnetic suppression to the emergence of superconductivity in BaFe2-xRuxAs2.
Findings
Superconductivity appears at x=0.75 to 1.125 with Tc ~22 K.
Magnetic order is suppressed as Ru content increases.
Band structure calculations show electron doping and magnetic moment reduction.
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 to 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 substitutiom. 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 Mossbauer measurements are presented. These indicate weakening of magnetic interaction with Ru substitution
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