Upper critical field, critical current density and activation energy of the new La1−xSmxO0.5F0.5BiS2 (x = 0.2, 0.8) superconductors

Selvan, Ganesan Kalai ; Thakur, Gohil Singh ; Manikandan, Krishnan ; Uwatoko, Yoshia ; Haque, Zeba ; Gupta, Laxmi Chand ; Ganguli, Ashok Kumar ; Arumugam, Sonachalam (2015) Upper critical field, critical current density and activation energy of the new La1−xSmxO0.5F0.5BiS2 (x = 0.2, 0.8) superconductors Journal of the Physical Society of Japan, 84 (12). Article ID 124701. ISSN 0031-9015

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Official URL: http://journals.jps.jp/doi/10.7566/JPSJ.84.124701

Related URL: http://dx.doi.org/10.7566/JPSJ.84.124701

Abstract

Critical current density (Jc), thermal activation energy (U0), and upper critical field (Hc2) of La1−xSmxO0.5F0.5BiS2 (x = 0.2, 0.8) superconductors are investigated from magnetic field dependent ρ(T) studies. The estimated upper critical field (Hc2) has low values of 1.04 T for x = 0.2 and 1.41 T for x = 0.8. These values are lower than Sm free LaO0.5F0.5BiS2 superconductor (1.9 T). The critical current density (Jc) is estimated to be 1.35 × 105 and 5.07 × 105 A/cm2 (2 K) for x = 0.2 and 0.8 respectively, using the Bean’s model. The thermal activation energy (U0/kB) is 61 K for x = 0.2 and 140 K for x = 0.8 as calculated from Arrhenius plots at low magnetic field (1 T) and indicates a strong flux pinning potential which might be co-existing with applied magnetic field.

Item Type:Article
Source:Copyright of this article belongs to The Physical Society of Japan.
ID Code:111585
Deposited On:28 Sep 2017 12:28
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