Field-controlled magnetic order in the quantum spin-ladder system<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mrow><mml:mo>(</mml:mo><mml:mrow><mml:mtext>Hpip</mml:mtext></mml:mrow><mml:mo>)</mml:mo></mml:mrow></mml:mrow><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mrow><mml:mtext>CuBr</mml:mtext></mml:mrow><mml:mn>4</mml:mn></mml:msub></mml:mrow></mml:math>

Thielemann, B.; Rüegg, Christian; Kiefer, K.; Rønnow, Henrik M.; Normand, B.; Bouillot, Pierre; Kollath, Corinna; Orignac, Edmond; Citro, Roberta; Giamarchi, Thierry; Läuchli, Andreas M.; Biner, Daniel; Krämer, Karl; Wolff-Fabris, F.; Zapf, V. S.; Jaime, M.; Stahn, J.; Christensen, Niels Bech; Grenier, B.; McMorrow, D. F.; Mesot, J.

doi:10.1103/physrevb.79.020408

Cited by 93 publications

(122 citation statements)

References 24 publications

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“…A short account of some of these results in connection with measurements on BPCB was previously published in Refs. [29][30][31]. Here we extend these results and give the details on how the theoretical results were obtained.…”

Section: Introductionmentioning

confidence: 82%

“…VI. The couplings have been experimentally determined to be 30,31 J ≈ 20-100 mK (6) and 30 J ≈ 3.55 K, J ⊥ ≈ 12.6 K.…”

Section: B Energy Scalesmentioning

confidence: 99%

“…However, it overestimates the effect of J by neglecting quantum fluctuations between different ladders. Such effects can be taken partly into account by a suitable change of the interladder coupling, 31 which will be discussed in Sec. IV D. Close to the critical fields, the interladder coupling J becomes larger than the effective energy of the 1D system.…”

Section: Mean-field Approximationmentioning

confidence: 99%

“…Additionally, the BEC transition and its corresponding order parameter have been observed experimentally by NMR 30 and ND measurements. 31 In addition, the excitations of this compound have recently been observed by inelastic neutron scattering (INS) 32,33 experiments. These are directly related to the dynamical correlations of spin ladders in a magnetic field.…”

Section: Introductionmentioning

confidence: 99%

“…Additionally, the magnetic field required for the realization of different phases lies for this compound in the experimentally reachable range. The LL predictions have been quantitatively tested for magnetization and specific heat, 29 nuclear magnetic resonance 30 (NMR), and neutron-diffraction (ND) 31 measurements. Additionally, the BEC transition and its corresponding order parameter have been observed experimentally by NMR 30 and ND measurements.…”

Section: Introductionmentioning

confidence: 99%

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Statics and Dynamics of Weakly Coupled Antiferromagnetic Spin-1/2 Ladders in a Magnetic Field

Bouillot

2013

Springer Theses

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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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Section: Introductionmentioning

confidence: 82%

“…VI. The couplings have been experimentally determined to be 30,31 J ≈ 20-100 mK (6) and 30 J ≈ 3.55 K, J ⊥ ≈ 12.6 K.…”

Section: B Energy Scalesmentioning

confidence: 99%

Section: Mean-field Approximationmentioning

confidence: 99%