Cluster phase transition in insulating spin glass Ga0.4Fe0.6NiAlO4 |
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| Authors: | J. K. Srivastava J. Ferreirinho S. Ramakrishnan S. J. Campbell G. Chandra R. Vijayaraghavan |
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| Affiliation: | (1) Tata Institute of Fundamental Research, 400005 Bombay, India;(2) Department of Physics, University College, The University of New South Wales, Australian Defence, Force Academy, 2600 Campbell, ACT, Australia;(3) The Institute of Physical and Chemical Research (RIKEN), 351-01 Wako-shi, Saitama, Japan;(4) Present address: Department of Physics, The University of Western Australia, 6009 Nedlands, WA, Australia |
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| Abstract: | Mössbauer effect, a.c. susceptibility and magnetisation studies (4.2≦T≦350 K, ?20≦H≦20 kOe) show that in the mixed spined ferrite Ga0.4Fe0.6NiAlO4, spin freezing occurs via cluster formation. As in some other insulating spin glasses, the spin glass phase diagram transitions occur not for individual spins but for clusters whose effective spins’ transverse and longitudinal components successively freeze. The presence of entropic spins and the centre shift of the field cooled hysteresis loop confirm the system’s frustrated nature. |
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