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Tomonaga-Luttinger Liquid Spin Dynamics in the Quasi-One-Dimensional Ising-Like Antiferromagnet BaCo2V2O8
Univ Grenoble Alpes, CEA, IRIG, MEM,MED, F-38000 Grenoble, France.;Univ Grenoble Alpes, Inst NEEL, F-38042 Grenoble, France..
Max Planck Inst Phys Komplexer Syst, D-01307 Dresden, Germany.;Univ Geneva, Dept Quantum Matter Phys, CH-1211 Geneva, Switzerland..
Univ Grenoble Alpes, Inst NEEL, F-38042 Grenoble, France..
Univ Grenoble Alpes, CEA, IRIG, MEM,MED, F-38000 Grenoble, France..
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2019 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 123, no 2, article id 027204Article in journal (Refereed) Published
Abstract [en]

Combining inelastic neutron scattering and numerical simulations, we study the quasi-one-dimensional Ising anisotropic quantum antiferromagnet BaCo2V2O8 in a longitudinal magnetic field. This material shows a quantum phase transition from a Neel ordered phase at zero field to a longitudinal incommensurate spin density wave at a critical magnetic field of 3.8 T. Concomitantly, the excitation gap almost closes and a fundamental reconfiguration of the spin dynamics occurs. These experimental results are well described by the universal Tomonaga-Luttinger liquid theory developed for interacting spinless fermions in one dimension. We especially observe the rise of mainly longitudinal excitations, a hallmark of the unconventional low-field regime in Ising-like quantum antiferromagnetic chains.

Place, publisher, year, edition, pages
American Physical Society, 2019. Vol. 123, no 2, article id 027204
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Physical Sciences
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URN: urn:nbn:se:kth:diva-255377DOI: 10.1103/PhysRevLett.123.027204ISI: 000474895000020OAI: oai:DiVA.org:kth-255377DiVA, id: diva2:1339832
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QC 20190731

Available from: 2019-07-31 Created: 2019-07-31 Last updated: 2019-07-31Bibliographically approved

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Månsson, Martin

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