2010/02/18 by Yukitoshi Motome, Nobuo Furukawa · 38 citations
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Antiferromagnetism #Condensed matter physics #Configuration entropy #Ferromagnetism #Frustration #Geometrical frustration #Magnetic and transport properties of perovskites and related materials #Materials science #Paramagnetism #Phase (matter) #Physics #Pyrochlore #Quantum mechanics #Rare-earth and actinide compounds #Residual entropy #Superexchange #Thermodynamics #cond-mat.str-el
paper · pdf · doi:10.1103/physrevlett.104.106407
published in Physical Review Letters 104(10), 106407 (American Physical Society) · 5 pages, 5 figures, accepted for publication in Phys. Rev. Lett
arxiv created 2010/02/18 · openalex publication_date 2010/03/12 · arxiv updated 2010/07/09 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
Competition between the ferromagnetic double-exchange interaction and the superexchange antiferromagnetic interaction is theoretically studied in the presence of geometrical frustration. As the superexchange interaction increases, the ferromagnetic metal becomes unstable and is taken over by a cooperative paramagnetic metal, in sharp contrast to a discontinuous transition to the antiferromagnetic insulator in the absence of frustration. In the critical region, the system exhibits a peculiar temperature-independent behavior with highly incoherent transport, suggesting a large residual entropy at low temperatures. We discuss the relevance of the results to the pressure-induced behaviors in Mo pyrochlore oxides [S. Iguchi et al., Phys. Rev. Lett. 102, 136407 (2009)].