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Excitations from a chiral magnetized state of a frustrated quantum spin liquid | | A. Zheludev
; V. O. Garlea
; A. Tsvelik
; L.-P. Regnault
; K. Habicht
; K. Kiefer
; B. Roessli
; | | Date: |
18 Sep 2009 | | Abstract: | We study excitations in weakly interacting pairs of quantum spin ladders
coupled through geometrically frustrated bonds. The ground state is a
disordered spin liquid, that at high fields is replaced by an ordered chiral
helimagnetic phase. The spectra observed by high-field inelastic neutron
scattering experiments on the prototype compound Sul-Cu2Cl4 are qualitatively
different from those in the previously studied frustration-free spin liquids.
Beyond the critical field Hc=3.7 T, the soft mode that drives the quantum phase
transition spawns two separate excitations: a gapless Goldstone mode and a
massive magnon. Additional massive quasiparticles are clearly visible below Hc,
but are destroyed in the ordered phase. In their place one observes a sharply
bound excitation continuum. | | Source: | arXiv, 0909.3355 | | Services: | Forum | Review | PDF | Favorites | |
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