Cao Xian-Sheng (曹先胜)a, Xiao Chun-Tao (肖春涛)b, Gywn Williamsc, Roy Roshkoc
a Material department,The second northwest university for nationalities, Ningxia 750021, China; b Physics Department, Lanzhou University, Lanzhou 730000, China; c Department of Physics and Astronomy, University of Manitoba, R3T 2N2, Canada
AbstractThe perovskite (La0.2Nd0.8)0.67Pb0.33MnO3 (LNPMO) with a Curie temperature TC=220K has been characterized by measuring the zero field cooled (ZFC) and field cooled (FC) moments over wide range of temperature 2K < T < 290K in an applied field of Ha = 3978.87 A/m, and also by the major hysteresis loop over the field range Ha $\leq$1061kA/m at T=10K. The data analysed within the framework of a generalized Preisach model, which includes thermal fluctuations, critical effects, and a temperature-dependent distribution of free energy barriers. The analysis shows that the response function of LNPMO is dominated by the growth of the anisotropy barriers.
Received: 25 November 2004
Revised: 21 December 2004
Accepted manuscript online:
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