Electrical and thermal transport properties of the electron-doped cuprate Sm2−xCexCuO4−y system. (5th October 2016)

• Record Type: Journal Article
• Authors: Scanderbeg, D J; Taylor, B J; Baumbach, R E; Paglione, J; Maple, M B
• Is Part Of: Journal of physics. Volume 28:Number 48(2016)
• Publication Date: 2016-10-05
• Subjects: electron doped -- high Tc cuprate -- vortex dynamics; Condensed matter -- Periodicals; Matière condensée -- Périodiques; Vaste stoffen; Vloeistoffen; Natuurkunde; Electronic journals; Computer network resources; 530.4105
• DOI: 10.1088/0953-8984/28/48/485702
• Languages: English
• ISSNs: 0953-8984

Abstract

Abstract: Electrical and thermal transport measurements were performed on thin films of the electron-doped superconductor Sm2− x Ce x CuO4− y ( x = 0.13 − 0.19) in order to study the evolving nature of the charge carriers from the under-doped to over-doped regime. A temperature versus cerium content ( T − x ) phase diagram has been constructed from the electrical transport measurements, yielding a superconducting region similar to that found for other electron-doped superconductors. Thermopower measurements show a dramatic change from the underdoped region ( x < 0.15) to the overdoped region ( x > 0.15). Application of the Fisher–Fisher–Huse (FFH) vortex glass scaling model to the magnetoresistance data was found to be insufficient to describe the data in the region of the vortex-solid to vortex-liquid transition. It was found instead that the modified vortex glass scaling model of Rydh, Rapp, and Anderson provided a good description of the data, indicating the importance of the applied field on the pinning landscape. A magnetic field versus temperature ( H − T ) phase diagram has also been constructed for the films with x ⩾ 0.14, displaying the evolution of the vortex glass melting lines H g ( T ) across the superconducting regime.