학술논문
Low-Dimensional Structure and Magnetism of the Quantum Antiferromagnet Rb4 Cu(MoO4 )3 and the Structure of Rb4 Zn(MoO4 )3 .
Document Type
Article
Author
Source
Subject
*LOW-dimensional semiconductors
*ANTIFERROMAGNETISM
*QUASIPARTICLES
*THERMODYNAMICS
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Language
ISSN
0002-7863
Abstract
Single crystals of the quantum low-dimensional antiferromagnet Rb4Cu(MoO4)3 and the nonmagnetic analogue Ru4Zn(MoO4)3 have been synthesized by a flux-growth method. Detailed structural studies indicate that the Cu(ll)-O network separated by a MoO4 layer has a strongly anisotropic hybridization along the a-axis, forming a quasi-one-dimensional (1-d) chain of Cu(ll) S = 1/2 spins. Furthermore, our low-temperature thermodynamic measurements have revealed that a quantum paramagnetic state with Wilson ratio ∼2 remains stable down to at least 0.1 K, 100 times lower than the intrachain antiferromagnetic coupling scale. The low-temperature magnetic and thermal properties are found to be consistent with theoretical predictions made for a 1-d network of S = 1/2 spins. [ABSTRACT FROM AUTHOR]