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:

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.

Завантаження

Дані завантаження ще не доступні.

Downloads

Опубліковано

2009-04-23

Як цитувати

(1)
Beznosov, A.; Fertman, E.; Desnenko, V.; Feher, A.; Kajnaková, M.; Ritter, C.; Khalyavin, D. Low-Temperature Phase Segregation in La2/3Ba1/3MnO3: Manifestation of Nonequilibrium Thermodynamics. Fiz. Nizk. Temp. 2009, 35, 571-577.

Номер

Розділ

Низькотемпературний магнетизм

Статті цього автора (авторів), які найбільше читають

<< < 1 2 3 4 5 > >>