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Switching of the gapped singlet spin-liquid state to an antiferromagnetically ordered state in Sr(Cu1xZnx)2O3

M. Azuma, Y. Fujishiro, M. Takano, M. Nohara, and H. Takagi
Phys. Rev. B 55, R8658(R) – Published 1 April 1997
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Abstract

Magnetic susceptibility and specific heat were measured for a Zn-substituted spin-1/2 Heisenberg two-leg ladder compound Sr(Cu1xZnx)2O3 (x⩽0.08) to investigate nonmagnetic impurity effects on the quantum spin system with a large spin gap of about ∼400 K. A clear anomaly attributed to the onset of an antiferromagnetic ordering was observed both in the magnetic susceptibility and the specific heat at low temperature even at only 1% of Zn. The Néel temperature showed a systematic Zn concentration dependence with a broad maximum at around 4% substitution (TNmax∼8 K). A finite amount of a T-linear term with a coefficient of γ∼3.5 mJ/K2 was observed in the specific heat above TN for x=0.02 and 0.04, suggesting that the spin excitation in the substituted compound becomes gapless.

    DOI:https://doi.org/10.1103/PhysRevB.55.R8658

    ©1997 American Physical Society

    Authors & Affiliations

    M. Azuma, Y. Fujishiro, and M. Takano

    • Institute for Chemical Research, Kyoto University, Uji, Kyoto-fu 611, Japan

    M. Nohara and H. Takagi

    • Institute for Solid State Physics, University of Tokyo, Roppongi Minato-ku, Tokyo 106, Japan

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    Issue

    Vol. 55, Iss. 14 — 1 April 1997

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