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Tricritical Point and the Doping Dependence of the Order of the Ferromagnetic Phase Transition of [Formula presented]

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

We report on the doping dependence of the order of the ferromagnetic metal to paramagnetic insulator phase transition in [Formula presented]. At [Formula presented], magnetization and specific heat data show a first order transition, with an entropy change ([Formula presented]) accounted for by both volume expansion and the discontinuity of [Formula presented] via the Clausius-Clapeyron equation. At [Formula presented], the data show a continuous transition with tricritical point exponents [Formula presented], [Formula presented], [Formula presented], and [Formula presented]. This tricritical point separates first- ([Formula presented]) from second-order ([Formula presented]) transitions. © 2002 The American Physical Society.

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