Structural phase transition in La2/3Ba1/3MnO3 perovskite: Elastic, magnetic, and lattice anomalies and microscopic mechanism | Zendy

E. L. Fertman | Zendy; Е. С. Сыркин | Zendy; Victor Lykah | Zendy; V. A. Desnenko | Zendy; A. B. Beznosov | Zendy; P. P. PalVal | Zendy; L. N. PalVal | Zendy; А.В. Федорченко | Zendy; D. D. Khalyavin | Zendy; A. Fehér | Zendy

Open Access

Structural phase transition in La2/3Ba1/3MnO3 perovskite: Elastic, magnetic, and lattice anomalies and microscopic mechanism

Author(s) -

E. L. Fertman,

Е. С. Сыркин,

Victor Lykah,

V. A. Desnenko,

A. B. Beznosov,

P. P. PalVal,

L. N. PalVal,

А.В. Федорченко,

D. D. Khalyavin,

A. Fehér

Publication year - 2015

Publication title -

aip advances

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.421

H-Index - 58

ISSN - 2158-3226

DOI - 10.1063/1.4928075

Subject(s) - manganite , condensed matter physics , materials science , phase transition , crystallite , magnetization , softening , magnetometer , soft modes , ferromagnetism , phase (matter) , nuclear magnetic resonance , chemistry , magnetic field , ferroelectricity , physics , composite material , organic chemistry , quantum mechanics , metallurgy , optoelectronics , dielectric

The temperature dependences of the elastic and magnetic properties of polycrystalline perovskite manganite La2/3Ba1/3MnO3 were studied using ultrasonic and SQUID magnetometer techniques. The minimum of the temperature-dependent sound velocity v(T) and corresponding maximum of the decrement δ(T) were found in the vicinity of the structural phase transition R3̄c↔Immaat Ts ∼ 200 K. Large alterations of v and δ indicate a structural phase transition of the soft mode type. A high sensitivity of dc magnetization to a low uniaxial pressure caused by the softening was found in the Ts region. A negative value of the linear thermal expansion coefficient along one of the crystallographic axis was found in the Imma phase near Ts. The proposed microscopic mechanism explains the appearance of the soft mode in the vicinity of the structural phase transition temperature associated with the displacement of the manganese atom from the center of the oxygen octahedron

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