Structural first-order transformation in La2/3Ba1/3MnO3: ESR study

Polishchuk, Dmytro; Tovstolytkin, A. I.; Fertman, E. L.; Desnenko, V. A.; Beznosov, A. B.; Kajňaková, M.; Feher, A.

doi:10.1016/j.jmmm.2012.07.054

Cited by 3 publications

(3 citation statements)

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“…3, where ions are presented. The transition between such symmetries is the 1st order one as based on group theory, 37 our previous studies 14,27,26 and the present ultrasonic and magnetic measurements. The expansion of free-energy density in the powers of the order parameter components Q i for the first order phase transition should be carried out to the terms of the sixth power: [38][39][40][41] …”

Section: Microscopic Mechanism Of the Structural Transformationsupporting

confidence: 60%

“…The specific anomalies of the elastic properties, together with the neutron diffraction and ESR data, 14,26,27 are evident of the martensitic character of the observed structural phase transition, which results in the coexistence of two phases with different crystal structures stabilized by the induced inner strain. The coexisting phases form a microstructure in the substance, which probably represents a sort of "red cabbage" structure.…”

Section: Elastic and Magnetic Propertiesmentioning

confidence: 83%

“…The La 2/3 Ba 1/3 MnO 3 compound experiences a structural phase transition at T s ∼200 K. 14,26,27 This transition possesses certain features of a martensitic transformation and causes a crystal phase separation in the compound: below room temperature, the compound represents a mixture of the high temperature rhombohedral phase R3c (austenite) and the low temperature orthorhombic phase Imma (martensite). Ultrasonic testing is one of the most widely used techniques for the characterization of perovskites over a wide temperature range.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2015

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Magnetic and charge ordering in nanosized manganites Applied Physics Reviews 1, 031302 (2014) The temperature dependences of the elastic and magnetic properties of polycrystalline perovskite manganite La 2/3 Ba 1/3 MnO 3 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 R3c ↔ Imma at T s ∼ 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 T s region. A negative value of the linear thermal expansion coefficient along one of the crystallographic axis was found in the Imma phase near T s . 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. C 2015 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution 3.0 Unported License. [http://dx

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