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Unconventional field-induced spin gap in an S = 1/2 chiral staggered chain
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Liu, J., Kittaka, S., Johnson, R. D., Lancaster, T., Singleton, J., Sakakibara, T., Kohama, Y., Tol, J. van, Ardavan, A., Williams, B. H., Blundell, S. J., Manson, Z. E., Manson, J. L. and Goddard, Paul (2019) Unconventional field-induced spin gap in an S = 1/2 chiral staggered chain. Physical Review Letters, 122 (5). 057207 . doi:10.1103/PhysRevLett.122.057207 ISSN 0031-9007.
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WRAP-Unconventional eld-induced-spin-gap-chain-Goddard-2019.pdf - Accepted Version - Requires a PDF viewer. Download (2667Kb) | Preview |
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Official URL: https://doi.org/10.1103/PhysRevLett.122.057207
Abstract
We investigate the low-temperature magnetic properties of the molecule-based chiral spin chain [Cu(pym)(H 2 O) 4 ]SiF 6 · H 2 O (pym = pyrimidine). Electron-spin resonance, magnetometry and heat capacity measurements reveal the presence of staggered g tensors, a rich low-temperature excitation spectrum, a staggered susceptibility and a spin gap that opens on the application of a magnetic field. These phenomena are reminiscent of those previously observed in non-chiral staggered chains, which are explicable within the sine-Gordon quantum-field theory. In the present case, however, although the sine-Gordon model accounts well for the form of the temperature-dependence of the heat capacity, the size of the gap and its measured linear field dependence do not fit with the sine-Gordon theory as it stands. We propose that the differences arise due to additional terms in the Hamiltonian resulting from the chiral structure of [Cu(pym)(H 2 O) 4 ]SiF 6 · H 2 O, particularly a uniform Dzyaloshinskii-Moriya coupling and a four-fold periodic staggered field
| Item Type: | Journal Article | |||||||||||||||||||||
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| Subjects: | Q Science > QC Physics | |||||||||||||||||||||
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | |||||||||||||||||||||
| Library of Congress Subject Headings (LCSH): | Magnetic fields, Particles (Nuclear physics) -- Chirality | |||||||||||||||||||||
| Journal or Publication Title: | Physical Review Letters | |||||||||||||||||||||
| Publisher: | American Physical Society | |||||||||||||||||||||
| ISSN: | 0031-9007 | |||||||||||||||||||||
| Official Date: | 8 February 2019 | |||||||||||||||||||||
| Dates: |
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| Volume: | 122 | |||||||||||||||||||||
| Number: | 5 | |||||||||||||||||||||
| Article Number: | 057207 | |||||||||||||||||||||
| DOI: | 10.1103/PhysRevLett.122.057207 | |||||||||||||||||||||
| Status: | Peer Reviewed | |||||||||||||||||||||
| Publication Status: | Published | |||||||||||||||||||||
| Reuse Statement (publisher, data, author rights): | © 2019 American Physical Society | |||||||||||||||||||||
| Access rights to Published version: | Restricted or Subscription Access | |||||||||||||||||||||
| Copyright Holders: | American Physical Society | |||||||||||||||||||||
| Date of first compliant deposit: | 9 January 2019 | |||||||||||||||||||||
| Date of first compliant Open Access: | 9 January 2019 | |||||||||||||||||||||
| RIOXX Funder/Project Grant: |
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