Effect of magnetic order on longitudinal Tomonaga-Luttinger liquid spin dynamics in weakly coupled spin-1/2 chains
(2023) In Physical Review B 107(13).- Abstract
- 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... (More)
- 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. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/b41351df-9d44-437c-9631-64d32f7efd6a
- author
- Shen, L. LU ; Alshemi, A. LU ; Campillo, E. LU ; Blackburn, E. LU ; Steffens, Paul ; Boehm, Martin ; Prabhakaran, D. and Boothroyd, A. T.
- organization
- publishing date
- 2023-04-20
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Physical Review B
- volume
- 107
- issue
- 13
- publisher
- American Physical Society
- external identifiers
-
- scopus:85158836933
- ISSN
- 2469-9950
- DOI
- 10.1103/PhysRevB.107.134425
- project
- Accessing high pressure and low temperature states of exotic magnetism
- language
- English
- LU publication?
- yes
- id
- b41351df-9d44-437c-9631-64d32f7efd6a
- alternative location
- https://link.aps.org/doi/10.1103/PhysRevB.107.134425
- date added to LUP
- 2023-05-09 09:18:54
- date last changed
- 2023-11-08 05:44:44
@article{b41351df-9d44-437c-9631-64d32f7efd6a, abstract = {{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 SrCo<sub>2</sub>V<sub>2</sub>O<sub>8</sub> , 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.}}, author = {{Shen, L. and Alshemi, A. and Campillo, E. and Blackburn, E. and Steffens, Paul and Boehm, Martin and Prabhakaran, D. and Boothroyd, A. T.}}, issn = {{2469-9950}}, language = {{eng}}, month = {{04}}, number = {{13}}, publisher = {{American Physical Society}}, series = {{Physical Review B}}, title = {{Effect of magnetic order on longitudinal Tomonaga-Luttinger liquid spin dynamics in weakly coupled spin-1/2 chains}}, url = {{http://dx.doi.org/10.1103/PhysRevB.107.134425}}, doi = {{10.1103/PhysRevB.107.134425}}, volume = {{107}}, year = {{2023}}, }