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  Statics and dynamics of weakly coupled antiferromagnetic spin-1/2 ladders in a magnetic field

Bouillot, P., Kollath, C., Lauchli, A. M., Zvonarev, M., Thielemann, B., Ruegg, C., et al. (2011). Statics and dynamics of weakly coupled antiferromagnetic spin-1/2 ladders in a magnetic field. Physical Review B, 83(5): 054407.

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Bouillot, P., Autor
Kollath, C., Autor
Lauchli, A. M.1, Autor           
Zvonarev, M., Autor
Thielemann, B., Autor
Ruegg, C., Autor
Orignac, E., Autor
Citro, R., Autor
Klanjsek, M., Autor
Berthier, C., Autor
Horvatic, M., Autor
Giamarchi, T., Autor
Affiliations:
1Max Planck Institute for the Physics of Complex Systems, Max Planck Society, ou_2117288              

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 MPIPKS: YB 2012
 Zusammenfassung: We investigate weakly coupled spin-1/2 ladders in a magnetic field. The work is motivated by recent experiments on the compound (C(5)H(12)N)(2)CuBr(4) (BPCB). We use a combination of numerical and analytical methods, in particular, the density-matrix renormalization group (DMRG) technique, to explore the phase diagram and the excitation spectra of such a system. We give detailed results on the temperature dependence of the magnetization and the specific heat, and the magnetic-field dependence of the nuclear-magnetic-resonance relaxation rate of single ladders. For coupled ladders, treating the weak interladder coupling within a mean-field or quantum Monte Carlo approach, we compute the transition temperature of triplet condensation and its corresponding antiferromagnetic order parameter. Existing experimental measurements are discussed and compared to our theoretical results. Furthermore, we compute, using time-dependent DMRG, the dynamical correlations of a single spin ladder. Our results allow to describe directly the inelastic neutron scattering cross section up to high energies. We focus on the evolution of the spectra with the magnetic field and compare their behavior for different couplings. The characteristic features of the spectra are interpreted using different analytical approaches such as the mapping onto a spin chain, a Luttinger liquid or onto a t-J model. For values of parameters for which such measurements exist, we compare our results to inelastic neutron scattering experiments on the compound BPCB and find excellent agreement. We make additional predictions for the high-energy part of the spectrum that are potentially testable in future experiments.

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 Datum: 2011-02-09
 Publikationsstatus: Erschienen
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 Identifikatoren: eDoc: 608330
ISI: 000287129700002
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Titel: Physical Review B
Genre der Quelle: Zeitschrift
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Ort, Verlag, Ausgabe: -
Seiten: - Band / Heft: 83 (5) Artikelnummer: 054407 Start- / Endseite: - Identifikator: ISSN: 1098-0121