Magnetic excitations in CuGeO3

M. Nishi; O. Fujita; J. Akimitsu; K. Kakurai; Y. Fujii

doi:10.1016/0921-4526(95)00128-V

Magnetic excitations in CuGeO₃

M. Nishi, O. Fujita, J. Akimitsu, K. Kakurai, Y. Fujii

Research output: Contribution to journal › Article › peer-review

10 Citations (Scopus)

Abstract

In the inorganic spin-Peierls compound CuGeO₃, we found a pronounced anisotropic magnetic energy dispersion, i.e. intra-chain exchange J_c ≈ 10.4 meV, inter-chain exchanges J_b ≈ 0.1 J_c and J_a ≈ - 0.01J_c and gap energy 2.1 meV extrapolated to T = 0 K. We also observed critical scattering at (0, 1, 1/2) above T_sp. The ratio of the correlation lengths ξ_c/ξ_b is in good agreement with that obtained from X-ray scattering at (1/2, 1, 1/2) by Pouget et al. This fact suggests that the Cu²⁺ spins fluctuate to form singlet-pair short-range order, but not to form ordinary antiferromagnetic order above T_sp.

Original language	English
Pages (from-to)	275-277
Number of pages	3
Journal	Physica B: Physics of Condensed Matter
Volume	213-214
Issue number	C
DOIs	https://doi.org/10.1016/0921-4526(95)00128-V
Publication status	Published - Aug 1 1995
Externally published	Yes

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Electrical and Electronic Engineering

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10.1016/0921-4526(95)00128-V

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title = "Magnetic excitations in CuGeO3",

abstract = "In the inorganic spin-Peierls compound CuGeO3, we found a pronounced anisotropic magnetic energy dispersion, i.e. intra-chain exchange Jc ≈ 10.4 meV, inter-chain exchanges Jb ≈ 0.1 Jc and Ja ≈ - 0.01Jc and gap energy 2.1 meV extrapolated to T = 0 K. We also observed critical scattering at (0, 1, 1/2) above Tsp. The ratio of the correlation lengths ξc/ξb is in good agreement with that obtained from X-ray scattering at (1/2, 1, 1/2) by Pouget et al. This fact suggests that the Cu2+ spins fluctuate to form singlet-pair short-range order, but not to form ordinary antiferromagnetic order above Tsp.",

author = "M. Nishi and O. Fujita and J. Akimitsu and K. Kakurai and Y. Fujii",

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T1 - Magnetic excitations in CuGeO3

AU - Nishi, M.

AU - Fujita, O.

AU - Akimitsu, J.

AU - Kakurai, K.

AU - Fujii, Y.

PY - 1995/8/1

Y1 - 1995/8/1

N2 - In the inorganic spin-Peierls compound CuGeO3, we found a pronounced anisotropic magnetic energy dispersion, i.e. intra-chain exchange Jc ≈ 10.4 meV, inter-chain exchanges Jb ≈ 0.1 Jc and Ja ≈ - 0.01Jc and gap energy 2.1 meV extrapolated to T = 0 K. We also observed critical scattering at (0, 1, 1/2) above Tsp. The ratio of the correlation lengths ξc/ξb is in good agreement with that obtained from X-ray scattering at (1/2, 1, 1/2) by Pouget et al. This fact suggests that the Cu2+ spins fluctuate to form singlet-pair short-range order, but not to form ordinary antiferromagnetic order above Tsp.

AB - In the inorganic spin-Peierls compound CuGeO3, we found a pronounced anisotropic magnetic energy dispersion, i.e. intra-chain exchange Jc ≈ 10.4 meV, inter-chain exchanges Jb ≈ 0.1 Jc and Ja ≈ - 0.01Jc and gap energy 2.1 meV extrapolated to T = 0 K. We also observed critical scattering at (0, 1, 1/2) above Tsp. The ratio of the correlation lengths ξc/ξb is in good agreement with that obtained from X-ray scattering at (1/2, 1, 1/2) by Pouget et al. This fact suggests that the Cu2+ spins fluctuate to form singlet-pair short-range order, but not to form ordinary antiferromagnetic order above Tsp.

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