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APS » Journals » Phys. Rev. Lett. » Volume 82 » Issue 6
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Phys. Rev. Lett. 82, 1285–1288 (1999)

Design and Preparation of a Novel Magnet Exhibiting Two Compensation Temperatures Based on Molecular Field Theory

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Shin-ichi Ohkoshi1, Yukinori Abe1, Akira Fujishima2,3, and Kazuhito Hashimoto1,3,*
1Research Center for Advanced Science and Technology, The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8904, Japan
2Department of Applied Chemistry, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
3Kanagawa Academy of Science and Technology, 1583 Iiyama, Atsugi, Kanagawa 243-0297, Japan

Received 8 October 1998; published in the issue dated 8 February 1999

See accompanying Physics Focus

We show the design and preparation of a novel type of magnet exhibiting two compensation temperatures; i.e., the spontaneous magnetization changes its sign twice with changing temperature. The key to obtaining this unusual behavior is the simultaneous incorporation of one antiferromagnetic and two different ferromagnetic interactions through the use of four different spin sources, as predicted by a calculation based on molecular field theory. As a prototype exemplifying this idea, we have prepared a Prussian blue analog, (Ni0.22IIMn0.60IIFe0.18II)1.5[CrIII(CN)6]̇7.6H2O, which exhibits magnetization reversals at 35 and 53 K.

© 1999 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.82.1285
DOI:
10.1103/PhysRevLett.82.1285
PACS:
75.30.Et, 75.50.Gg

*Author to whom correspondence should be addressed.

 
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