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Phys. Rev. B 77, 134419 (2008) [7 pages]

Successive phase transitions to antiferromagnetic and weak-ferromagnetic long-range order in the quasi-one-dimensional antiferromagnet Cu3Mo2O9

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Tomoaki Hamasaki, Tomoyuki Ide, Haruhiko Kuroe, and Tomoyuki Sekine
Department of Physics, Sophia University, 7-1 Kioi-cho, Chiyoda, Tokyo 102-8554, Japan

Masashi Hase
National Institute for Materials Science (NIMS), 1-2-1 Sengen, Tsukuba 305-0047, Japan

Ichiro Tsukada
Central Research Institute of Electric Power Industry, 2-11-1 Iwadokita, Komae-shi, Tokyo 201-8511, Japan

Toshiro Sakakibara
Institute for Solid State Physics, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa-shi, Chiba 277-8581, Japan
Received 25 February 2008; published 8 April 2008

Investigation of the magnetism of Cu3Mo2O9 single crystal, which has antiferromagnetic (AF) linear chains interacting with AF dimers, reveals an AF second-order phase transition at TN=7.9  K. Although weak-ferromagnetic-like behavior appears at lower temperatures in low magnetic fields, complete remanent magnetization cannot be detected down to 0.5  K. However, a jump is observed in the magnetization below weak-ferromagnetic (WF) phase transition at Tc~=2.5  K when a tiny magnetic field along the a axis is reversed, suggesting that the coercive force is very weak. A component of magnetic moment parallel to the chain forms AF long-range order (LRO) below TN, while a perpendicular component is disordered above Tc at zero magnetic field and forms WF-LRO below Tc. Moreover, the WF-LRO is also realized by applying magnetic fields even between Tc and TN. These results are explainable by both magnetic frustration among symmetric exchange interactions and competition between symmetric and asymmetric Dzyaloshinskii–Moriya exchange interactions.

©2008 The American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevB.77.134419
DOI: 10.1103/PhysRevB.77.134419
PACS: 75.10.Pq; 75.10.Jm; 75.25.+z; 75.50.Ee
  • 75.10.Pq
    Spin chain models (magnetism)
  • 75.10.Jm
    Quantized spin models (magnetism)
  • 75.25.+z
    Spin arrangements in magnetically ordered materials
  • 75.50.Ee
    Antiferromagnetics
  • YEAR: 2008
KEYWORDS: antiferromagnetic materials, coercive force, copper compounds, exchange interactions (electron), ferromagnetic-antiferromagnetic transitions, frustration, long-range order, magnetic moments, magnetisation

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