Anomalies of upper critical field in the spinel superconductor LiTi2O4-δ

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Zhongxu Wei
  • Ge He
  • Wei Hu
  • Zhongpei Feng
  • Xinjian Wei
  • Qian Li
  • Jie Yuan
  • Chuanying Xi
  • Zhaosheng Wang
  • Qihong Chen
  • Beiyi Zhu
  • Fang Zhou
  • Xiaoli Dong
  • Li Pi
  • A. Kusmartseva
  • F. V. Kusmartsev
  • Zhongxian Zhao
  • Kui Jin

Related Research Unit(s)

Detail(s)

Original languageEnglish
Article number184509
Journal / PublicationPhysical Review B
Volume100
Issue number18
Online published13 Nov 2019
Publication statusPublished - Nov 2019

Abstract

High-field electrical transport and point-contact tunneling spectroscopy are used to investigate superconducting properties of spinel oxide LiTi2O4-δ films with various oxygen contents. It is striking that although the superconducting transition temperature and energy gap are almost unchanged, an isotropic upper critical field Bc2 up to 26.0 T is observed in the oxygen-rich sample, which is more than twice the Bc2 of 11.3 T in the anoxic one. The change of the dominating pair-breaking mechanism from the orbital effect to the spin flip at Bc2 is achieved by tuning oxygen contents, which can be explained by the appearance of small Fermi pockets due to extra oxygen. Our paper provides deep understanding of the intrinsic relation between Bc2 and the complex Fermi surface, and contributes a promising way to enhance Bc2 for practical superconductors.

Research Area(s)

  • NORMAL STATE PROPERTIES, ELECTRONIC-STRUCTURE, ENERGY-SPECTRUM, SEMICONDUCTORS, CARRIERS, LIMIT

Citation Format(s)

Anomalies of upper critical field in the spinel superconductor LiTi2O4-δ. / Wei, Zhongxu; He, Ge; Hu, Wei; Feng, Zhongpei; Wei, Xinjian; Ho, Chun Yuen; Li, Qian; Yuan, Jie; Xi, Chuanying; Wang, Zhaosheng; Chen, Qihong; Zhu, Beiyi; Zhou, Fang; Dong, Xiaoli; Pi, Li; Kusmartseva, A.; Kusmartsev, F. V.; Zhao, Zhongxian; Jin, Kui.

In: Physical Review B, Vol. 100, No. 18, 184509, 11.2019.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review