Superconductivity in La1−xSmxO0.5F0.5BiS2(x = 0.2, 0.8) under hydrostatic pressure

Kalai Selvan, G. ; Thakur, Gohil S. ; Manikandan, K. ; Banerjee, A. ; Haque, Zeba ; Gupta, L. C. ; Ganguli, Ashok K. ; Arumugam, S. (2016) Superconductivity in La1−xSmxO0.5F0.5BiS2(x = 0.2, 0.8) under hydrostatic pressure Journal of Physics D: Applied Physics, 49 (27). Article ID 275002. ISSN 0022-3727

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We have investigated the pressure effect on the newly discovered samarium-doped La1−xSmxO0.5F0.5BiS2 superconductors. More than a threefold increase in Tc (10.3 K) is observed with external pressure (at ~1.74 GPa at a rate of 4.08 K GPa−1) for x  =  0.2 composition. There is a concomitant large improvement in the quality of the superconducting transition. Beyond this pressure Tc decreases monotonously at the rate of −2.09 K GPa−1. In the x  =  0.8 sample, we do not observe any enhancement in Tc with the application of pressure (up to 1.76 GPa). The semiconducting behavior observed in the normal-state resistivity of both samples is significantly subdued with the application of pressure which, if interpreted by invoking the thermal activation process, implies that the activation energy gap of the carriers is significantly reduced with pressure. We believe these observations should generate further interest in La1−xSmxO0.5F0.5BiS2 superconductors.

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