Low-temperature phase segregation in La2/3Ba1/3MnO3: Manifestation of nonequilibrium thermodynamics

Автор(и)

  • A.B. Beznosov B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine, 47 Lenin Ave., Kharkov 61103, Ukraine
  • E.L. Fertman B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine, 47 Lenin Ave., Kharkov 61103, Ukraine
  • V.A. Desnenko B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine, 47 Lenin Ave., Kharkov 61103, Ukraine
  • A. Feher Centre of Low Temperature Physics of the Faculty of Science of P.J. Šafárik University and IEP SAS, Park Angelinum 9 SK-04154 Košice, Slovakia
  • M. Kajnaková Centre of Low Temperature Physics of the Faculty of Science of P.J. Šafárik University and IEP SAS, Park Angelinum 9 SK-04154 Košice, Slovakia
  • C. Ritter Institut Laue-Langevin, Boite Postale 156, 38042 Grenoble Cedex 9, France
  • D. Khalyavin Institute of Solid State and Semiconductor Physics NASB, 17 P. Brovka str., 220072 Minsk, Belarus

DOI (Low Temperature Physics):


https://doi.org/10.1063/1.3151991

Ключові 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

Як цитувати

(1)
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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