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

Low Temp. Phys. 35, 449 (2009); doi:10.1063/1.3151991

Issue Date: June 2009

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A. B. Beznosov, E. L. Fertman, and 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 and M. Kajňaková
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 St., 220072 Minsk, Belarus
Thermodynamic characteristics of the perovskite-like compound La2/3Ba1/3MnO3, exhibiting a structural phase transformation of the martensitic type with a characteristic temperature Ts[approximate]200  K, are studied in the temperature range 2–340  K. Step-like hysteretic temperature behavior of the effective heat capacity is revealed at 150–250  K and attributed to the discrete kinetics and a latent heat of the martensitic transformation. The magnetic subsystem is found to exhibit a magnetic glass state below 220  K and temperature hysteresis of the magnetic susceptibility clearly pronounced in the 40–100  K and 180–230  K regions. The Debye and Einstein temperatures, thetaD=230  K and thetaE=500  K, respectively, derived from the experimental Debye–Waller factors for the La/Ba, Mn, and O sublattices, are used to refine contributions from the structural and magnetic transformations to the heat capacity and to reveal thermodynamically nonequilibrium states. ©2009 American Institute of Physics
History: Submitted 5 December 2008; revised 17 February 2009
Permalink: http://link.aip.org/link/?LTPHEG/35/449/1
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KEYWORDS and PACS

Keywords
PACS
  • 65.40.Ba
    Heat capacity of crystalline solids
  • 64.75.-g
    Phase equilibria
  • 75.30.Cr
    Saturation moments and magnetic susceptibilities in magnetically ordered materials
  • 75.60.Ej
    Magnetization curves, hysteresis, Barkhausen and related effects
  • 64.70.K-
    Solid-solid transitions
  • 75.40.Cx
    Static properties of magnetic materials
  • 63.70.+h
    Statistical mechanics of lattice vibrations and displacive phase transitions
  • 75.30.Kz
    Magnetic phase boundaries
  • YEAR: 2009

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ISSN:
1063-777X (print)   1090-6517 (online)
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