Journal of Low Temperature Physics

, Volume 73, Issue 3–4, pp 305–319 | Cite as

Observation of large diamagnetism in La-Sr-Nb-O films up to room temperature

  • T. Ōgushi
  • S. Higo
  • N. G. Suresha
  • Y. Honjo
  • Y. Ōzono
  • I. Kawano
  • Y. Hakuraku
  • L. Rinderer
Article

Abstract

Large diamagnetic transitions along with sharp resistive transitions were observed in the La-Sr-Nb-O system near room temperature (∼290 K). The amplitude of the diamagnetism reaches 35% of that of a pure Nb sheet. In addition, a behavior similar to weak magnetic spin ordering was observed for some samples at a temperature of about 290 K, over a temperature range of 30 K. The diamagnetism reappears above this temperature and continues up toT ∼320 K. It is not clear what composition ratio of La-Sr-Nb-O is responsible for this large diamagnetism and the high critical temperature. The yield probability of these samples is around 50%. The characteristics of the samples having not passed through many thermal cycles remain stable for about 1 month.

Keywords

Critical Temperature Magnetic Material Thermal Cycle Composition Ratio Resistive Transition 

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Copyright information

© Plenum Publishing Corporation 1988

Authors and Affiliations

  • T. Ōgushi
    • 1
  • S. Higo
    • 1
  • N. G. Suresha
    • 1
  • Y. Honjo
    • 1
  • Y. Ōzono
    • 1
  • I. Kawano
    • 1
  • Y. Hakuraku
    • 1
  • L. Rinderer
    • 2
  1. 1.Department of ElectronicsKagoshima UniversityKagoshimaJapan
  2. 2.Institute of Experimental PhysicsLausanne UniversityLausanne-DorignySwitzerland

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