Temperature dependent structural modulation in Ca0.82La0.18FeAs2 pnictide superconductors. (11th August 2015)

• Record Type: Journal Article
• Authors: Joseph, Boby; Marini, Carlo; Demitri, Nicola; Capitani, Francesco; Bernasconi, Andrea; Zhou, Wei; Xing, Xiangzhuo; Shi, Zhixiang
• Is Part Of: Superconductor science & technology. Volume 28:Number 9(2015:Sep.)
• Publication Date: 2015-08-11
• Subjects: superconducting materials -- x-ray diffraction -- transport properties -- electronic structure; 74.70.-b -- 61.05.cp -- 74.25.Jb -- 74.25.Fy; Superconductivity -- Periodicals; Superconductors -- Periodicals; 537.623
• DOI: 10.1088/0953-2048/28/9/092001
• Languages: English
• ISSNs: 0953-2048

Abstract

Abstract: Temperature dependent synchrotron x-ray powder diffraction data on FeAs2 pnictide superconductor demonstrate anisotropic thermal expansion along the out-of-plane and in-plane lattice parameters. Thermal expansion along the c -axis shows a distinct change from 2.9 × 10 −4 Å K −1 at ∼300 K to 1.0 × 10 −4 Å K −1 at ∼110 K, whereas the in-plane axes, a and b, in the temperature range 300 to 100 K, show a constant thermal expansion that is an order of magnitude smaller (∼0.3×10 −4 Å K −1 ). The temperature dependence of the out-of-plane lattice parameter is found to have a good correlation with the behavior of the resistivity indicating the importance of the interlayer interaction in governing the transport properties of 112 pnictide superconductors.