2002/08/30 by Shuichi Murakami, Naoto Nagaosa · 1 citation
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Colossal magnetoresistance #Condensed matter physics #Electronic and Structural Properties of Oxides #Giant magnetoresistance #Magnetic and transport properties of perovskites and related materials #Magnetic field #Magnetoresistance #Materials science #Multicritical point #Phase (matter) #Phase diagram #Physics #Quantum mechanics #cond-mat.str-el
paper · pdf · doi:10.1103/physrevlett.90.197201
published as Phys. Rev. Lett. 90, 197201 (2003) · 4 pages, 3 figures
arxiv created 2002/08/30 · openalex publication_date 2003/05/13 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
The colossal magnetoresistance in manganites AMnO3 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 for comparison 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 being driven by enhanced fluctuations near the multicritical point. Furthermore, we obtain a universal scaling relation for the H/M versus M2 plot (Arrott plot), which fits rather well with the experimental data, providing further evidence for the enhanced fluctuation.