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APS » Journals » Phys. Rev. Lett. » Volume 94 » Issue 5
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Phys. Rev. Lett. 94, 057205 (2005) [4 pages]

Field-Controlled Phase Separation at the Impurity-Induced Magnetic Ordering in the Spin-Peierls Magnet CuGeO3

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V. N. Glazkov* and A. I. Smirnov
P. L. Kapitza Institute for Physical Problems RAS, 117334 Moscow, Russia

H.-A. Krug von Nidda and A. Loidl
Experimental Physics V, Center for Electronic Correlations and Magnetism, University of Augsburg, 86135 Augsburg, Germany

K. Uchinokura† and T. Masuda‡
Department of Advanced Materials Science, The University of Tokyo, 5-1-5 Kashiwa-no-ha, Kashiwa 277-8581, Japan

Received 29 April 2004; published 9 February 2005

The paramagnetic fraction surviving at the impurity-induced antiferromagnetic phase transition in the spin-Peierls magnet CuGeO3 is found to increase with an external magnetic field. This effect is explained by the competition of the Zeeman interaction and of the exchange interaction of local antiferromagnetic clusters formed on the spin-gap background near impurities.

© 2005 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.94.057205
DOI:
10.1103/PhysRevLett.94.057205
PACS:
75.10.Jm, 75.50.Ee, 76.50.+g

*Electronic address: glazkov@kapitza.ras.ru

†Present address: The Institute of Physical and Chemical Research (RIKEN), Wako, Saitama 351-0198, Japan.

‡Present address: Condensed matter sciences division, Oak Ridge National Laboratory, Oak Ridge, TN 37831-6393, USA.

 
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