Collective Magnetic Excitations in the Spin Ladder Sr(14)Cu(24)O(41) Measured Using High-Resolution Resonant Inelastic X-Ray Scattering
Academic Article
Publication Date:
2009
abstract:
We investigate magnetic excitations in the spin-ladder compound Sr14Cu24O41 using high-resolution
Cu L3 edge resonant inelastic x-ray scattering (RIXS). Our findings demonstrate that RIXS couples to
two-triplon collective excitations. In contrast to inelastic neutron scattering, the RIXS cross section
changes only moderately over the entire Brillouin zone, revealing high sensitivity also at small momentum
transfers, allowing determination of the two-triplon energy gap as 100 30 meV. Our results are backed
by calculations within an effective Hubbard model for a finite-size cluster, and confirm that optical
selection rules are obeyed for excitations from this spherically symmetric quantum spin-liquid ground
state.
Cu L3 edge resonant inelastic x-ray scattering (RIXS). Our findings demonstrate that RIXS couples to
two-triplon collective excitations. In contrast to inelastic neutron scattering, the RIXS cross section
changes only moderately over the entire Brillouin zone, revealing high sensitivity also at small momentum
transfers, allowing determination of the two-triplon energy gap as 100 30 meV. Our results are backed
by calculations within an effective Hubbard model for a finite-size cluster, and confirm that optical
selection rules are obeyed for excitations from this spherically symmetric quantum spin-liquid ground
state.
Iris type:
01.01 Articolo in rivista
List of contributors:
Braicovich, Lucio; Ghiringhelli, GIACOMO CLAUDIO
Published in: