Publications Repository - Helmholtz-Zentrum Dresden-Rossendorf

1 Publication
Ultrasonic investigation of NiCl2-4SC(NH2)2 in the vicinity of the quantum critical points
Zherlitsyn, S.; Chiatti, O.; Sytcheva, A.; Wosnitza, J.; Zvyagin, A. A.; Zapf, V. S.; Jaime, M.; Paduan-Filho, A.;
We report results of sound-velocity and sound-attenuation measurements in the quantum S = 1 spin-chain magnet NiCl2-4SC(NH2)2 that shows a field-induced antiferromagnetic (AF) ordering and two corresponding quantum critical points at Hc = 2.1 T and Hs = 12.6 T. The longitudinal acoustic c33 mode modulates the in-chain exchange interaction and shows a softening in the vicinity of the quantum critical points, accompanied by energy dissipation in the acoustic wave. We discuss our results with a model where the main contribution to the spin-lattice interaction arises from the exchange-striction coupling within one-dimensional spin-chains.
  • Open Access LogoJournal of Physics: Conference Series 145(2009), 012069

Publ.-Id: 12663 - Permalink