Naslov
Quantum-Critical Spin Dynamics in Quasi-One-Dimensional Antiferromagnets

Autori
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

Izvornik
Physical Review Letters (0031-9007) 109 (2012), 17; 177206-1

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
magentism; onedimensionality; NMR; scaling

Sažetak
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.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

POVEZANOST RADA