Quantum-Critical Spin Dynamics in Quasi-One-Dimensional Antiferromagnets (CROSBI ID 187272)
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Podaci o odgovornosti
Mukhopadhyay, Sutirtha ; Klanjšek, Martin ; Grbić, Mihael Srđan ; Blinder, Remi ; Mayaffre, Hadrien ; Berthier, Claude ; Horvatić, Mladen ; Continentino, Mucio Amado ; Paduan-Filho, Armando ; Chiari, Brunetto ; Piovesana Olivo
engleski
Quantum-Critical Spin Dynamics in Quasi-One-Dimensional Antiferromagnets
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 quasi-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 gapless 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.
magentism; onedimensionality; NMR; scaling
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Podaci o izdanju
109 (17)
2012.
177206-1-177206-5
objavljeno
0031-9007
10.1103/PhysRevLett.109.177206