Doping dependence of the upper critical field in untwinned YBa2Cu3O7−δ thin films. (20th December 2022)

• Record Type: Journal Article
• Authors: Wahlberg, Eric; Arpaia, Riccardo; Kalaboukhov, Alexei; Bauch, Thilo; Lombardi, Floriana
• Is Part Of: Superconductor science & technology. Volume 36:Number 2(2023)
• Publication Date: 2022-12-20
• Subjects: YBCO thin films -- strain -- superconductivity; Superconductivity -- Periodicals; Superconductors -- Periodicals; 537.623
• DOI: 10.1088/1361-6668/aca93b
• Languages: English
• ISSNs: 0953-2048

Abstract

Abstract: We report on measurements of the doping dependence of the upper critical field H c, 2 in 50 nm thick YBa2 Cu3 O 7 − δ films. The films are untwinned and are characterized by a small in-plane compressive strain. We find that the H c, 2 shows a strong decrease in the underdoped region of the phase diagram, in agreement with that which has been measured in relaxed single crystals. The origin of the decrease of H c, 2 in the underdoped regime is discussed within a scenario where charge density wave (CDW) order competes with superconductivity. This demonstrates the potential of using thin films to study the phase diagram of high- T c materials under strain, and opens up the possibility for investigating the interplay between CDW order and superconductivity tuned by strain.