Observation of large diamagnetism in La-Sr-Nb-O films up to room temperature |
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| Authors: | T. Ōgushi S. Higo N. G. Suresha Y. Honjo Y. Ōzono I. Kawano Y. Hakuraku L. Rinderer |
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| Affiliation: | (1) Department of Electronics, Kagoshima University, Koorimoto, 890 Kagoshima, Japan;(2) Institute of Experimental Physics, Lausanne University, CH-1015 Lausanne-Dorigny, Switzerland |
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| 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. |
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