Физика Низких Температур: Том 27, Выпуск 4 (Апрель 2001), c. 398-402    ( к оглавлению , назад )

Peculiarities of the volume magnetostriction in La1-xSrxMnO3 in the Curie point region

L. I. Koroleva, A. I. Abramovich, R. V. Demin, and A. V. Michurin

M. V. Lomonosov Moscow State University, Vorobyevy Gory, Moscow 119899, Russia
E-mail: koroleva@ofef343.phys.msu.su

Received September 25, 2000


The parallel l|| and perpendicular l^ magnetostriction with respect to the applied magnetic field and the thermal expansion Dl/l are studied on La1-xSrxMnO3 single crystals with x=0.1, 0.15, and 0.3. For the conducting sample with x=0.3 and the semiconducting sample with x=0.15 the volume magnetostriction (w=l||+2l^) is negative and the |w|(T) curves go through a maximum at the Curie point TC. At T > TC its Dl/l temperature dependence is stronger than the linear one. For the semiconducting sample with x=0.1 w is negative at T < TC and |w|0 at T~TC. Its Dl/l is linear at TTC. The behavior of w and Dl/l are explained by a magnetic two-phase state, due to strong s-d exchange.

75.80.+q - Magnetomechanical and magnetoelectric effects, magnetostriction
75.30.Kz - Magnetic phase boundaries (including magnetic transitions, metamagnetism, etc.)
75.40.-s - Critical-point effects, specific heats, short-range order (see also 65.40.-b Heat capacities of solids)
74.72.-h - Cuprate superconductors (high-Tc and insulating parent compounds)