Magnetic properties of Cu6Ge6O18xH2O(x=06): A compound of S=1/2 Heisenberg competing antiferromagnetic chains coupled by interchain interaction

Masashi Hase, Kiyoshi Ozawa, and Norio Shinya
Phys. Rev. B 68, 214421 – Published 18 December 2003
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Abstract

We studied magnetic properties of powder samples of Cu6Ge6O18xH2O (x=06). Susceptibility above the antiferromagnetic (AF) transition temperature (TN) agrees with susceptibility obtained from the one-dimensional Heisenberg S=1/2 model with competing AF interactions. Since the estimated ratio (0.27–0.31) between nearest-neighbor and next-nearest-neighbor AF exchange interactions is close to a critical value (0.24–0.30) which determines whether a spin gap exists or not, the spin system in Cu6Ge6O18xH2O is probably located near a boundary between spin systems with gapless and gapped magnetic excitation. The value of TN/Tmax, where Tmax is the temperature at which the susceptibility is maximum, shows a unique dependence on x. We speculate that a spin gap due to competing AF interactions exists at x<1.54 and that magnetic excitation is gapless at x>1.54, explaining qualitatively the dependence of TN/Tmax on x.

  • Received 2 July 2003

DOI:https://doi.org/10.1103/PhysRevB.68.214421

©2003 American Physical Society

Authors & Affiliations

Masashi Hase*, Kiyoshi Ozawa, and Norio Shinya

  • National Institute for Materials Science (NIMS), 1-2-1 Sengen, Tsukuba, 305-0047, Japan

  • *Electronic address: HASE.Masashi@nims.go.jp

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Vol. 68, Iss. 21 — 1 December 2003

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