Spectral and thermodynamic properties of a strong-leg quantum spin ladder.
The strong-leg S=1/2 Heisenberg spin ladder system (C(7)H(10)N)(2)CuBr(4) is investigated using density matrix renormalization group calculations, inelastic neutron scattering, and bulk magnetothermodynamic measurements. Measurements showed qualitative differences compared to the strong-rung case. A long-lived two-triplon bound state is confirmed to persist across most of the Brillouin zone in a zero field. In applied fields, in the Tomonaga-Luttinger spin-liquid phase, elementary excitations are attractive, rather than repulsive. In the presence of weak interladder interactions, the strong-leg system is considerably more prone to three-dimensional ordering.
Neutron Scattering and Magnetism, Laboratory for Solid State Physics, ETH, Zurich, Switzerland.
D
D
Schmidiger
P
P
Bouillot
S
S
Mühlbauer
S
S
Gvasaliya
C
C
Kollath
T
T
Giamarchi
A
A
Zheludev