Quantum-critical spin dynamics in quasi-one-dimensional antiferromagnets

Abstract

By means of nuclear spin-lattice relaxation rate 1/T1, we follow the spin dynamics as a function of the applied magnetic field in two gapped one-dimensional quantum antiferromagnets: the anisotropic spin-chain system NiCl2-4SC(NH2)2 and the spin-ladder system (C5H12N)2CuBr4. In both systems, spin excitations are confirmed to evolve from magnons in the gapped state to spinons in the gapples Tomonaga-Luttinger-liquid state. In between, 1/T1 exhibits a pronounced, continuous variation, which is shown to scale in accordance with quantum criticality. We extract the critical exponent for 1/T1, compare it to the theory, and show that this behavior is identical in both studied systems, thus demonstrating the universality of quantum critical behavior.

References in corpus (13)

• Bose-Einstein Condensation in Magnetic Insulators
• Quantum criticality
• Heavy Fermions and Quantum Phase Transitions
• Quantum Criticality
• Observation of scale invariance and universality in two-dimensional Bose gases
• Quantum Magnets under Pressure: Controlling Elementary Excitations in TlCuCl3
• Dimensional reduction at a quantum critical point
• Controlling Luttinger liquid physics in spin ladders under a magnetic field
• Thermodynamics of the Spin Luttinger-Liquid in a Model Ladder Material
• Direct Observation of Magnon Fractionalization in the Quantum Spin Ladder
• Field-Controlled Magnetic Order in the Quantum Spin-Ladder System (Hpip)2CuBr4
• Universal temperature dependence of the magnetization of gapped spin chains
• Critical properties and Bose Einstein Condensation in dimer spin systems

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