Superconducting transition tuned by spin-polarized carrier injection in YBa2Cu3Oy/LaAlO3/La 0.7Ca0.3MnO3 heterostructures

T. Nojima, M. Iwata, T. Hyodo, S. Nakamura, N. Kobayashi

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

The effect of spin-polarized carrier injection on superconducting transition has been studied on YBa2Cu3O y/LaAlO3/La0.7Ca0.3MnO3 (superconductor/insulator/ferromagnet) heterostructures. Under the influence of spin-polarized current Iinj injected from the ferromagnetic layers, we have observed a strong suppression of the critical current Ic with the efficiency as large as 4.4 and a shift of the resistive transition curve R(T) to the low temperature side in the superconducting layer. In the measurements of the tunnel current-voltage (Iinj-VT) characteristics between the ferromagnetic layer and the superconducting one, a continuous kink, which leads to a drastic decrease in the differential conductance dIinj/dVT is found at a current, where R appears and Ic disappears. This anomaly is ascribed to the second order phase transition from the superconducting state to the normal one induced by Iinj.

Original languageEnglish
Pages (from-to)147-151
Number of pages5
JournalPhysica C: Superconductivity and its applications
Volume412-414
Issue numberSPEC. ISS.
DOIs
Publication statusPublished - 2004 Oct 1

Keywords

  • Critical current
  • LaCaMnO
  • Spin injection
  • Tunnel conductance
  • YBaCu O

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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