Fizika Nizkikh Temperatur: Volume 25, Number 8-9 (August 1999), p. 992-995    ( to contents , go back )

Visualization of the antiferromagnetic insulator-ferromagnetic metal phase transition in manganite Nd0.5Sr0.5MnO3

S. L. Gnatchenko, A. B. Chizhik, I. O. Shklyarevskiy, D. N. Merenkov

B. Verkin Institute for Low Temperature Physics and Engineering, National Academy of Sciences of Ukraine, 47, Lenin Ave., 310164, Kharkov, Ukraine
E-mail: gnatchenko@ilt.kharkov.ua

V. I. Kamenev, Yu. G. Pashkevich,

A. Galkin Institute for Physics and Engineering of National Academy of Sciences of Ukraine, R.Ljuksemburg 72, 340114 Donetsk, Ukraine

K. V. Kamenev, G. Balakrishnan, and D. McK Paul

Department of Physics, University of Warwick, Coventry CV4 7AL, England
pos Анотація:

(Received March 10, 1999 )

Abstract

It is found that the first-order phase transition from the antiferromagnetic (AFM) nonmetallic state to the ferromagnetic (FM) metallic one in manganite Nd0.5Sr0.5MnO3 is accompanied by a significant change of reflectivity of visible light. The effect was used to visualize the AFM-FM phase transition in Nd0.5Sr0.5MnO3. The coexistence of AFM and FM phases was visually observed during the spontaneous and field-induced AFM-FM transitions. In both cases the transition occurred by nucleation and expansion of domains of an energetically favorable phase. But a periodic domain structure of a magnetic intermediate state was not formed under the phase transition. A stripe domain structure was observed in the AFM state whereas the FM phase was found to be uniform.

PACS:
75.30.Kz - Magnetic phase boundaries (including magnetic transitions, metamagnetism, etc.)
78.20.-e - Optical properties of bulk materials and thin films (for optical properties related to materials treatment, see 81.40.Tv; for optical materials, see 42.70-a; for optical properties of superconductors, see 74.25.Gs; for optical properties of rocks and mine
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