Evolution of magnetic phases in single crystals of SrFe1xCoxO3 solid solution

Y. W. Long, Y. Kaneko, S. Ishiwata, Y. Tokunaga, T. Matsuda, H. Wadati, Y. Tanaka, S. Shin, Y. Tokura, and Y. Taguchi
Phys. Rev. B 86, 064436 – Published 27 August 2012

Abstract

Single crystals of SrFe1xCoxO3 solid solution with high valence ions (Fe4+/Co4+) were synthesized by combining floating-zone and high-pressure oxygen-annealing techniques. As the Co content (x) is increased, the ground state changes from the helimagnetic state (x ≤ 0.05) through cluster glass to the ferromagnetic state (x ≥ 0.2), with a high Curie temperature ranging between 245 and 337 K. We found that, within the helimagnetic state (x ≤ 0.05), several different magnetic phases, which possibly reflect versatile three-dimensional helical orders with multiple wave vectors, emerge depending on temperature and magnetic field strength. In addition, we observed Co-concentration–dependent systematic evolution of the complex magnetic phase diagram. Resonant soft x-ray diffraction measurements revealed a gradual decrease in the wave vector of the helix toward the ferromagnetic phase.

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  • Received 9 April 2012

DOI:https://doi.org/10.1103/PhysRevB.86.064436

©2012 American Physical Society

Authors & Affiliations

Y. W. Long1,2,*, Y. Kaneko1,3, S. Ishiwata4, Y. Tokunaga3, T. Matsuda4, H. Wadati4, Y. Tanaka5, S. Shin5,6, Y. Tokura1,3,4, and Y. Taguchi3

  • 1Multiferroics Project, Exploratory Research for Advanced Technology, Japan Science and Technology Agency, c/o RIKEN Advanced Science Institute, Wako 351-0198, Japan
  • 2Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
  • 3Cross-Correlated Materials Research Group (CMRG) and Correlated Electron Research Group (CERG), RIKEN Advanced Science Institute, Wako 351-0198, Japan
  • 4Department of Applied Physics and Quantum-Phase Electronics Center (QPEC), University of Tokyo, Hongo, Tokyo 113-8656, Japan
  • 5RIKEN SPring-8 Center, Sayo, Hyogo 679-5148, Japan
  • 6The Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba 277-8581, Japan

  • *Corresponding author: ywlong@iphy.ac.cn

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Vol. 86, Iss. 6 — 1 August 2012

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