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Science 10 November 1995:
Vol. 270. no. 5238, pp. 961 - 963
DOI: 10.1126/science.270.5238.961
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Reports

A First-Order Phase Transition Induced by a Magnetic Field

H. Kuwahara,  Y. Tomioka,  A. Asamitsu,  Y. Moritomo,  Y. Tokura (1)

An electronic (metal-to-insulator) phase transition of the first order, which can be caused by an external magnetic field, was discovered in Nd1/2Sr1/2MnO3. A clear hysteresis was observed during the increase and decrease of an external magnetic field at a fixed temperature. The hysteretic field region was observed to depend critically on temperature and to drastically expand with a decrease of temperature, perhaps as a result of suppression of the effect of thermal fluctuations on the first-order phase transition. Although it has seldom been observed, this is thought to be a generic feature of the first-order phase transition at low temperatures near 0 kelvin.


H. Kuwahara, Y. Tomioka, A. Asamitsu, Y. Moritomo, Joint Research Center for Atom Technology, Tsukuba 305, Japan.
Y. Tokura, Joint Research Center for Atom Technology, Tsukuba 305, Japan, and Department of Applied Physics, University of Tokyo, Tokyo 113, Japan.
(1) To whom correspondence should be addressed.


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