Angular dependent torque measurements on CaFe0.88Co0.12AsF. (24th June 2016)

• Record Type: Journal Article
• Authors: Xiao, H; Gao, B; Ma, Y H; Li, X J; Mu, G; Hu, T
• Is Part Of: Journal of physics. Volume 28:Number 32(2016)
• Publication Date: 2016-06-24
• Subjects: torque -- anisotropy parameter -- superconductivity; Condensed matter -- Periodicals; Matière condensée -- Périodiques; Vaste stoffen; Vloeistoffen; Natuurkunde; Electronic journals; Computer network resources; 530.4105
• DOI: 10.1088/0953-8984/28/32/325701
• Languages: English
• ISSNs: 0953-8984

Abstract

Abstract: Out-of-plane angular dependent torque measurements were performed on CaFe0.88 Co0.12 AsF (Ca1 1 1 1) single crystals. In the normal state, the torque data shows sin ⁡ 2 θ angular dependence and H 2 magnetic field dependence, as a result of paramagnetism. In the mixed state, the torque signal is a combination of the vortex torque and paramagnetic torque, and the former allows the determination of the anisotropy parameter γ . At T = 11.5 K, γ (11.5 K ≃ 0.5 T c ) = 19.1, which is similar to the result of SmFeAsO0.8 F0.2, γ ≃ 23 at T ≃ 0.4 T c . So the 11 1 1 is more anisotropic compared to 11 and 122 families of iron-based superconductors. This may suggest that the electronic coupling between layers in 1 1 1 1 is less effective than in 11 and 122 families.