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Tricritical point and the doping dependence of the order of the ferromagnetic phase transition of La1-xCaxMnO3.

  • Author(s): Kim, D
  • Revaz, B
  • Zink, BL
  • Hellman, F
  • Rhyne, JJ
  • Mitchell, JF
  • et al.
Abstract

We report on the doping dependence of the order of the ferromagnetic metal to paramagnetic insulator phase transition in La1-xCaxMnO3. At x=0.33, magnetization and specific heat data show a first order transition, with an entropy change (2.3 J/mol K) accounted for by both volume expansion and the discontinuity of M approximately 1.7mu(B) via the Clausius-Clapeyron equation. At x=0.4, the data show a continuous transition with tricritical point exponents alpha=0.48+/-0.06, beta=0.25+/-0.03, gamma=1.03+/-0.05, and delta=5.0+/-0.8. This tricritical point separates first- (x<0.4) from second-order (x>0.4) transitions.

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