Random Potential Effect near the Bicritical Region in Perovskite Manganites as Revealed by Comparison with the Ordered Perovskite Analogs

D. Akahoshi, M. Uchida, Y. Tomioka, T. Arima, Y. Matsui, and Y. Tokura
Phys. Rev. Lett. 90, 177203 – Published 2 May 2003

Abstract

The orbital-charge-spin ordering phase diagram for half-doped perovskites Ln1/2Ba1/2MnO3 (Ln = rare earth) with ordered Ln/Ba cations has been investigated comparatively with that of the Ln/Ba solid-solution analogs. A large modification of the phase diagram is observed upon the A-site disordering near the original bicritical point between the charge-orbital ordering and ferromagnetic metallic phases. The random potential by quenched disorder inherent in the A-site solid solution is found to suppress the respective long-range orders and gives rise to the colossal magnetoresistive state.

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  • Received 3 September 2002

DOI:https://doi.org/10.1103/PhysRevLett.90.177203

©2003 American Physical Society

Authors & Affiliations

D. Akahoshi1, M. Uchida2, Y. Tomioka1, T. Arima3,4, Y. Matsui2, and Y. Tokura1,4,5

  • 1Correlated Electron Research Center (CERC), Advanced Industrial Science and Technology (AIST), Tsukuba 305-8562, Japan
  • 2Advanced Materials Laboratory, National Institute for Materials Science, Tsukuba, 305-0044, Japan
  • 3Institute of Materials Science, University of Tsukuba, Tsukuba 305-8573, Japan
  • 4Spin Superstructure Project, ERATO, JST, C/O AIST, Tsukuba 305-8562, Japan
  • 5Department of Applied Physics, University of Tokyo, Tokyo 113-8656, Japan

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Issue

Vol. 90, Iss. 17 — 2 May 2003

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