Direct Observation of Magnon Fractionalization in the Quantum Spin Ladder

Thielemann, B.; Rüegg, Ch.; Rønnow, Henrik M.; Läuchli, Andreas M.; Caux, Jean-Sébastien; Normand, B.; Biner, Daniel; Krämer, Karl; Güdel, Hans‐Ulrich; Stahn, J.; Habicht, K.; Kiefer, K.; Boehm, Martin; McMorrow, D. F.; Mesot, J.

doi:10.1103/physrevlett.102.107204

Cited by 116 publications

(135 citation statements)

References 23 publications

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“…1 However, for the compound BPCB, the interladder coupling is so small that present-day experiments do not resolve this small broadening. 32,33 In contrast, in the gapless phase the effect of the interladder coupling can change considerably the excitations. In particular, below the transition temperature to the 3D-ordered phase, a Bragg peak appears at q = π in the transverse dynamical functions S ±∓ π .…”

Section: E Influence Of the Weak Interladder Coupling On The Excitatmentioning

confidence: 99%

“…Then we focus on static and low-energy results of the system. Finally, we discuss the detection of excitations by INS 32,33 measurements. In particular, we give a prediction of the INS cross section in a full range of energy and compare its low-energy part with the measured spectra on the compound BPCB.…”

Section: Experimental Measurementsmentioning

confidence: 99%

“…18) matches with the Cu 2+ location. 28,30,32 The unpaired spins form two types of inequivalent ladders (Fig. 18) along the a axis (a, b, and c are the unit cell vectors of BPCB).…”

Section: (Esr)mentioning

confidence: 99%

“…The compound (C 5 H 12 N) 2 CuBr 4 , customarily called BPCB or (Hpip) 2 CuBr 4 , has been intensively investigated using different experimental methods such as NMR, 30 ND, 31 INS, 32,33 calorimetry, 29 magnetometry, 84 magnetostriction, 85,86 and electron-spin-resonance spectroscopy 87 …”

Section: A Structure Of the Compound (C 5 H 12 N) 2 Cubrmentioning

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%

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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: E Influence Of the Weak Interladder Coupling On The Excitatmentioning

confidence: 99%

Section: Experimental Measurementsmentioning

confidence: 99%

“…18) matches with the Cu 2+ location. 28,30,32 The unpaired spins form two types of inequivalent ladders (Fig. 18) along the a axis (a, b, and c are the unit cell vectors of BPCB).…”

Section: (Esr)mentioning

confidence: 99%