Collective spin excitations in a quantum spin ladder probed by high-resolution Resonant Inelastic X-ray Scattering

Details Collective spin excitations in a quantum spin ladder probed by high-resolution Resonant Inelastic X-ray Scattering Collective spin excitations in a quantum spin ladder probed by high-resolution Resonant Inelastic X-ray Scattering

2009-01-09

arxiv.org/abs/0901.1331v2

Physics

Condensed Matter

Strongly Correlated Electrons

10 pages, 4 figures, revised version

Scientific paper

We investigate magnetic excitations in the spin-ladder compound Sr$_{14}$Cu$_{24}$O$_{41}$ using high-resolution Cu $L_3$-edge Resonant Inelastic X-ray Scattering (RIXS). Our findings demonstrate that RIXS couples to collective spin excitations from a quantum spin-liquid ground state. In contrast to Inelastic Neutron Scattering (INS), the RIXS cross section changes only moderately over the entire Brillouin Zone (BZ), revealing a high sensitivity also at small momentum transfers. The two-triplon energy gap is found to be $100\pm 30$ meV. Our results are supported by calculations within an effective Hubbard model for a finite-size cluster.

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