Colossal magnetoresistance in manganites as a multicritical phenomenon

Details Colossal magnetoresistance in manganites as a multicritical phenomenon Colossal magnetoresistance in manganites as a multicritical phenomenon

2002-08-30

arxiv.org/abs/cond-mat/0209002v1

Phys. Rev. Lett. 90, 197201 (2003)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.90.197201

The colossal magnetoresistance in manganites AMnO_3 is studied from the viewpoint of multicritical phenomena. To understand the complicated interplay of various phases, we study the Ginzburg-Landau theory in terms of both the mean-field approximation and the renormalization-group analysis to compare with the observed phase diagram. Several novel features, such as the first-order ferromagnetic transition, and the dip in the transition temperature near the multicritical point, can be understood as driven by enhanced fluctuations near the multicritical point. Furthermore, we obtain a universal scaling relation for the H/M-M^2 plot (Arrott plot), which fits rather well with the experimental data, providing the further evidence for the enhanced fluctuation.

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