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One-dimensional spin fluctuations in a transition metal oxide

✍ Scribed by J.F. DiTusa; S-W. Cheong; C. Broholm; G. Aeppli; L.W. Rupp Jr.; B. Batlogg

Publisher
Elsevier Science
Year
1994
Tongue
English
Weight
137 KB
Volume
194-196
Category
Article
ISSN
0921-4526

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✦ Synopsis

We use inelastic neutron scattering from polycrystalhne Y2BaNiOs and Y2BaNio.9sZno.0405 specimens to demonstrate that the spin fluctuations in this compound are one-dimensional. In addition they are gapped, in accord with the S=I nature of the Ni 2+ and the Haidane conjecture. The gap remains well defined and may even grow slightly in the Zn-diluted compound.

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The temperature behavior of magnetic, thermal and transport properties of ferromagnetic transition metals is shown to be mainly determined by the electron spin density fluctuations. The effect of the fluctuation dynamics on magnetism and heat capacity of iron is considered. The fluctuation theory of