The cooling rate effect on structure and flux pinning force of FeTeSe single crystal deposited by self-flux method

Synthesis and characterization of FeTe0.5Se0.5 single crystals prepared by self-flux technique with two different cooling rates of 1.45 and 5.83 ?/h have been investigated. The XRD results show that the samples have tetragonal structure. The SEM results indicate that the samples demonstrate a terrace-like formation. The superconducting transition temperatures of two samples obtained as magnetization measurement are seen to be 14.62 and 14.38 K for sample A (5.83 ?/h) and sample B (1.45 ?/h), respectively. The M–H curves reveal the existence of ferromagnetism in all measured temperatures. The normalized pinning force f(Fp/Fpmax) at h(H/Hirr) curves are scaled using the Dew-Hughes model given by f(h) = Ahp(1 - h)q with A = 2.73, p = 0.81 and q = 0.69, the ratio [p/p + q] ? 0.54 for cooling rate of 5.83 ?/h sample. © 2018, Springer Science+Business Media, LLC, part of Springer Nature.FDK-2017-8224, FBA-2015-4464Acknowledgements This work was supported by Research Fund of Cukurova University [Grant Nos.: FDK-2017-8224, FBA-2015-4464]