Magnetoelastic Anomalies and Suppression of Jahn-Teller Distortions in La1-xSrxMnO3 by Pulsed Magnetic Fields |
| A.M. Kadomtsevaa, Yu.F. Popova, G.P. Vorob'eva, K.I. Kamilova, V.Yu. Ivanovb, A.A. Mukhinb and A.M. Balbashovc a Moscow State University, Leninskie Gori, 119899 Moscow, Russia b General Physics Institute of the RAS, 38 Vavilov St., 117942 Moscow, Russia c Moscow Power Engineering Inst., 14 Krasnokazarmen St., 105835 Moscow, Russia |
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| Thermal expansion Δl/l(T) and magnetostriction λ∥, ⊥ (H,T) in the pulsed magnetic fields H up to 250 kOe were studied in the single La1-xSrxMnO3 crystals (x=0.1, 0 .125, and 0.15) at temperatures T=10-320 K. Anomalies in the Δl/l (T) curves were observed near a charge (polaron) ordering (Tp) and structural transitions between orthorhombic Jahn-Teller distorted O' phase and high temperature orthorhombic (pseudocubic) O* one (T's). A noticeable increase in the field-induced magnetostriction λ∥, ⊥ (H) was revealed in the O' phase at Tp<T<T's. Jumps in the λ∥, ⊥ (H) curves were observed at temperatures near Tp. The observed features may be related to a suppression of the Jahn-Teller O' phase by the magnetic field and field induced transition to a new orbital-ordered ferromagnetic state. |
| DOI: 10.12693/APhysPolA.97.599 PACS numbers: 75.30.Kz, 75.50.Pp |