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APS » Journals » Phys. Rev. B » Volume 70 » Issue 17
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Phys. Rev. B 70, 174412 (2004) [7 pages]

Impact of a small number of nonmagnetic impurities on H-T magnetic phase diagram of CuFeO2

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Noriki Terada* and Setsuo Mitsuda
Department of Physics, Faculty of Science, Tokyo University of Science, Kagurazaka 1-3, Shinjuku-ku, Tokyo, Japan

Karel Prokes
Hahn-Meitner-Institute, Glienicker Strasse 100, D-14109 Berlin, Germany

Osamu Suzuki and Hideaki Kitazawa
Nanomaterials Laboratory, National Institute for Materials Science, Tsukuba-shi, Ibaraki 305-0047, Japan

H. Aruga Katori
RIKEN (The Institute of Physical and Chemical Research) Wako, Saitama 351-0198, Japan

Received 15 July 2003; revised 16 July 2004; published 11 November 2004

We have obtained the magnetic field (H) versus temperature (T) magnetic phase diagram for the triangular lattice antiferromagnet CuFe0.98Al0.02O2 using neutron diffraction, magnetization and specific heat measurements on single-crystal samples. On the substitution of a small amount of nonmagnetic Al3+ impurity for Fe3+, the H-T phase diagram was completely modified from that of CuFeO2, suggesting that the quasi-Ising spin character observed in CuFeO2 disappears, and the Heisenberg spin character of Fe3+ is retrieved as a result of the substitution.

© 2004 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.70.174412
DOI:
10.1103/PhysRevB.70.174412
PACS:
75.25.+z, 75.30.Kz, 75.50.Ee, 75.60.Ej

*Electronic address: terada@nsmsmac4.ph.kagu.tus.ac.jp

 
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