Low-temperature phase segregation in La2/3Ba1/3MnO3: Manifestation of nonequilibrium thermodynamics
DOI (Low Temperature Physics):
https://doi.org/10.1063/1.3151991Ключові слова:
phase transitions, structural segregation, heat capacity, entropy, magnetic susceptibility, cluster glass.Анотація
Thermodynamic characteristics of the perovskite-like compound La2/3Ba1/3MnO3 exhibiting structural phase transformation of the martensitic type with characteristic temperature Ts ≈ 200 K have been studied in the temperature range 2–340 K. Step-like hysteretic temperature behavior of the effective heat capacity has been revealed at 150–250 K and attributed to the discrete kinetics and a latent heat of the martensitic transformation. Magnetic subsystem was found exhibiting magnetic glass state below 220 K and temperature hysteresis of the magnetic susceptibility brightly pronounced in the 40–100 K and 180–230 K regions. The Debye and Einstein temperatures, qD = 230 K and qE = 500 K, respectively, derived from the experimental Debye–Waller factors for La/Ba, Mn and O sublattices, have been used to refine contributions from the structural and magnetic transformations to the heat capacity and to reveal thermodynamically nonequilibrium states.
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Опубліковано
2009-04-23
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A.B. Beznosov, E.L. Fertman, V.A. Desnenko, A. Feher, M. Kajnaková, C. Ritter, and D. Khalyavin, Low-temperature phase segregation in La2/3Ba1/3MnO3: Manifestation of nonequilibrium thermodynamics, Low Temp. Phys. 35, (2009) [Fiz. Nizk. Temp. 35, 571-577, (2009)] DOI: https://doi.org/10.1063/1.3151991.
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Низькотемпературний магнетизм
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