Evidence for nodeless superconductivity in NdO1−xFxBiS2 (x = 0.3 and 0.5) single crystals. (19th May 2015)

• Record Type: Journal Article
• Authors: Jiao, Lin; Weng, Zongfa; Liu, Jianzhong; Zhang, Jinglei; Pang, Guiming; Guo, Chunyu; Gao, Fei; Zhu, Xiyu; Wen, Hai-Hu; Yuan, H Q
• Is Part Of: Journal of physics. Volume 27:Number 22(2015)
• Publication Date: 2015-05-19
• Subjects: BiS2-based superconductors -- order parameter -- London penetration depth; Condensed matter -- Periodicals; Matière condensée -- Périodiques; Vaste stoffen; Vloeistoffen; Natuurkunde; Electronic journals; Computer network resources; 530.4105
• DOI: 10.1088/0953-8984/27/22/225701
• Languages: English
• ISSNs: 0953-8984

Abstract

Abstract: We study the superconducting pairing states of NdO1− x F x BiS2 ( x = 0.3 and 0.5) by measuring the magnetic penetration depth Δ λ ( T ) using the tunnel-diode-oscillator (TDO) technique. An upturn is observed in Δ λ ( T ) as well as the magnetic susceptibility χ ( T ) in the low-temperature limit, which is attributed to the paramagnetism of Nd ions. After subtracting the paramagnetic contributions, the penetration depth Δ λ ( T ) follows an exponential-type temperature dependence at T ≪ T c, providing evidence of nodeless superconductivity for NdO1− x F x BiS2 . This is further supported by the analyses of superfluid density ρ s ( T ), which can be well described by a BCS model with an energy gap of Δ(0) ∼ 2.15 k B T c .