${}^{133}$Cs NMR investigation of 2D frustrated Heisenberg antiferromagnet, Cs${}_2$CuCl${}_4$

Abstract

We report ${}^{133}$Cs nuclear magnetic resonance (NMR) measurements on the 2D frustrated Heisenberg antiferromagnet Cs${}_2$CuCl${}_4$ down to 2 K and up to 15 T. We show that ${}^{133}$Cs NMR is a good probe of the magnetic degrees of freedom in this material. Cu spin degrees of freedom are sensed through a strong anisotropic hyperfine coupling. The spin excitation gap opens above the critical saturation field. The gap value was determined from the activation energy of the nuclear spin-lattice relaxation rate in a magnetic field applied parallel to the Cu chains (b axis). The values of the g-factor and the saturation field are consistent with the neutron-scattering and magnetization results. The measurements of the spin-spin relaxation time are exploited to show that no structural changes occur down to the lowest temperatures investigated.

14 pages, 7 figures, To appear in NJP (http://www.iop.org)

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• Thermodynamics and spin gap of the Heisenberg ladder calculated by the look-ahead Lanczos algorithm
• Observation of extended scattering continua characteristic of spin fractionalization in the 2D frustrated quantum magnet Cs2CuCl4 by neutron scattering
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• Bose-Einstein Condensation of Magnons in Cs2CuCl4
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• Algebraic vortex liquid in spin-1/2 triangular antiferromagnets: Scenario for Cs_2CuCl_4
• Ordering in Cs2CuCl4: Is there a proximate spin liquid?
• Spin dynamics of the quasi two dimensional spin-1/2 quantum magnet Cs_2CuCl_4
• Statistics of spinons in the spin-liquid phase of Cs2CuCl4
• Spin Structure Factor of the Frustrated Quantum Magnet Cs_2CuCl_4

Cited by in corpus (5)

• Nature of the low energy excitations in the short range ordered region of Cs${}_2$CuCl${}_4$ as revealed by ${}^{133}$Cs NMR
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• BaV3O8: A possible Majumdar-Ghosh system with S=1/2
• Site-selective observation of spin dynamics of a Tomonaga-Luttinger liquid in frustrated Heisenberg chains
• Multi-modal spectroscopy of order parameter distributions