Magnetic resonance on LiCuVO
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| Authors: | Ch Kegler N Büttgen H-A Krug von Nidda A Krimmel L Svistov BI Kochelaev A Loidl A Prokofiev W Aßmus |
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| Institution: | Experimentalphysik V, Elektronische Korrelationen und Magnetismus, Institut für Physik, Universit?t Augsburg, 86135 Augsburg, Germany, DE
Physikalisches Institut, Johann-Wolfgang-Goethe-Universit?t, 60054 Frankfurt, Germany, DE
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| Abstract: | EPR and 7Li NMR measurements were performed in the distorted inverse spinel V(LiCu)O4 down to 1.5 K. Anisotropy effects on magnetic resonance spectra due to the Jahn-Teller distortion of the oxygen octahedra
surrounding the copper ions are discussed. The estimation of the spin-spin interactions deduced from the EPR-relaxation rate
Δ
H reveals a situation comparable to the prototypical one-dimensional S
= 1/2 Heisenberg antiferromagnet CuGeO3. Approaching three-dimensional antiferromagnetic order ( T
N
≈ 2 K) from above, both magnetic relaxation rates, Δ
H
EPR
and
7
(1/
T
1
), respectively, exhibit nearly the same critical divergence reminding to the onset of three-dimensional order in two-dimensional
layered systems.
Received 22 January 2001 and Received in final form 6 May 2001 |
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| Keywords: | PACS 76 30 Fc Iron group (3d) ions and impurities (Ti-Cu) – 76 60 Es Relaxation effects – 75 30 -m Intrinsic properties of magnetically ordered materials |
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