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Elizabeth Blackburn. Portrait.

Elizabeth Blackburn

Professor

Elizabeth Blackburn. Portrait.

Effect of magnetic order on longitudinal Tomonaga-Luttinger liquid spin dynamics in weakly coupled spin-1/2 chains

Author

  • L. Shen
  • A. Alshemi
  • E. Campillo
  • E. Blackburn
  • Paul Steffens
  • Martin Boehm
  • D. Prabhakaran
  • A. T. Boothroyd

Summary, in English

The quantum many-body interactions in one-dimensional spin- 1/2 systems are subject to Tomonaga-Luttinger liquid (TLL) physics, which predict an array of multiparticle excitations that form continua in momentum-energy space. Here we use inelastic neutron spectroscopy to study the TLL spin dynamics in SrCo2V2O8 , a compound which contains weakly coupled spin-1/2 chains of Co atoms, at 0.05 K and in a longitudinal magnetic field up to 9.0 T. The measurements were performed above 3.9 T, where the ground-state Néel antiferromagnetic (AFM) order is completely suppressed and the multiparticle excitations are exclusively of the TLL type. In this region and below 7.0 T, the longitudinal TLL mode—psinon/antipsinon (P/AP)—is unexpectedly well described by a damped harmonic oscillator (DHO) while approaching the zone center defining the static spin-spin correlations. A non-DHO-type, continuumlike signal is seen at higher fields, but deviations from the ideal one-dimensional TLL still remain. This change in the P/AP mode coincides with the phase transition between the longitudinal spin density wave (LSDW) and transverse AFM order. Inside the LSDW state, the DHO-type P/AP spectral weight increases and the linewidth broadens as the magnetic order parameter decreases. These results reveal the impact of three-dimensional magnetic order on the TLL spin dynamics; they call for beyond-mean-field treatment for the interchain exchange interactions.

Department/s

  • Synchrotron Radiation Research
  • LTH Profile Area: Nanoscience and Semiconductor Technology
  • LTH Profile Area: Photon Science and Technology
  • LU Profile Area: Light and Materials
  • NanoLund: Centre for Nanoscience

Publishing year

2023-04-20

Language

English

Publication/Series

Physical Review B

Volume

107

Issue

13

Document type

Journal article

Publisher

American Physical Society

Topic

  • Condensed Matter Physics (including Material Physics, Nano Physics)

Status

Published

Project

  • Accessing high pressure and low temperature states of exotic magnetism

ISBN/ISSN/Other

  • ISSN: 2469-9950