2014
DOI: 10.1103/physrevb.89.104407
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Excitations and quasi-one-dimensionality in field-induced nematic and spin density wave states

Abstract: We study the excitation spectrum and dynamical response functions for several quasi-one-dimensional spin systems in magnetic fields without dipolar spin order transverse to the field. This includes both nematic phases, which harbor "hidden" breaking of spin-rotation symmetry about the field and have been argued to occur in high fields in certain frustrated chain systems with competing ferromagnetic and antiferromagnetic interactions, and spin density wave states, in which spin-rotation symmetry is truly unbrok… Show more

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Cited by 63 publications
(88 citation statements)
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“…However, the transverse components < S As the field is further decreased, theories predict that the nematic order is replaced by a spin-density-wave (SDW) state, where the moments are collinear with the external field and their magnitudes are modulated with a generally incommensurate periodicity. [7][8][9][14][15][16] This SDW state can be regarded as a spatial order of the bound magnon pairs stabilized by their mutual repulsive interaction, which becomes dominant over the gain in the kinetic energy of the BEC phase as the density of bound magnon pairs increases.…”
mentioning
confidence: 99%
“…However, the transverse components < S As the field is further decreased, theories predict that the nematic order is replaced by a spin-density-wave (SDW) state, where the moments are collinear with the external field and their magnitudes are modulated with a generally incommensurate periodicity. [7][8][9][14][15][16] This SDW state can be regarded as a spatial order of the bound magnon pairs stabilized by their mutual repulsive interaction, which becomes dominant over the gain in the kinetic energy of the BEC phase as the density of bound magnon pairs increases.…”
mentioning
confidence: 99%
“…[17] belong to the same series as the ones studied in our previous high-field NMR experiments [13]. The main part of the specific heat measurements were carried out in the Tallahassee National High Magnetic Field Laboratory with the use of a homemade relaxation-type calorimeter operating at temperatures 1.8-30 K in magnetic fields up to 35 T. Supplementary measurements were performed on a Quantum Design Physical Property Measurement System (PPMS) with a 3 He insert and a 9-T cryomagnet. The samples of 0.67 and 5.8 mg by mass were studied in the first and the second experiments, respectively.…”
Section: Resultsmentioning
confidence: 99%
“…In contrast, the influence of defects on the SM ordering is expected to be more pronounced for the following reasons. The wave vector of a SM structure in a 1D J 1 -J 2 model is field dependent and expressed as follows: [1,[3][4][5][6]. This relation has been traced experimentally in the field range below 15 T (Refs.…”
Section: Discussionmentioning
confidence: 98%
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“…As the field increases, spin correlations change markedly because bound magnon pairs are stabilized by ferromagnetic J 1 . The bound magnon pairs form a spin density wave (SDW) in medium fields, whereas, in high fields just below the saturation of magnetization, they exhibit Bose-Einstein condensation into quantum multipolar states [8][9][10][11]. One of the multipolar states expected just below the saturation is a quadrupolar state of magnon pairs called a spin nematic state, analogous to nematic liquid crystals.…”
mentioning
confidence: 99%