Skip to Main content Skip to Navigation
Journal articles

From One- to Two-Magnon Excitations in the S = 3 / 2 Magnet β − CaCr 2 O 4

Abstract : We apply neutron spectroscopy to measure the magnetic dynamics in the S=3/2 magnet $\beta$-CaCr$_2$O$_4$ (T$_N$=21 K). The low-energy fluctuations, in the ordered state, resemble large-S linear spin-waves from the incommensurate ground state. However, at higher energy transfers, these semi-classical and harmonic dynamics are replaced by an energy and momentum broadened continuum of excitations. Applying kinematic constraints required for energy and momentum conservation, sum rules of neutron scattering, and comparison against exact diagonalization calculations, we show that the dynamics at high-energy transfers resemble low-S one-dimensional quantum fluctuations. $\beta$-CaCr$_2$O$_4$ represents an example of a magnet at the border between classical N\'eel and quantum phases, displaying dual characteristics.
Document type :
Journal articles
Complete list of metadata

https://hal.archives-ouvertes.fr/hal-03117938
Contributor : Claudine Le Vaou <>
Submitted on : Thursday, January 21, 2021 - 4:48:02 PM
Last modification on : Friday, January 22, 2021 - 3:30:15 AM

Links full text

Identifiers

Collections

Citation

M. Songvilay, S. Petit, F. Damay, G. Roux, N. Qureshi, et al.. From One- to Two-Magnon Excitations in the S = 3 / 2 Magnet β − CaCr 2 O 4. Physical Review Letters, American Physical Society, 2021, 126 (1), ⟨10.1103/PhysRevLett.126.017201⟩. ⟨hal-03117938⟩

Share

Metrics

Record views

14