The Library
Magnetic order and disorder in a quasi-two-dimensional quantum Heisenberg antiferromagnet with randomized exchange
Tools
Tools
Tools
Xiao, F., Blackmore, William J. A., Huddart, B. M., Gomilšek, M., Hicken, T. J., Baines, C., Baker, P. J., Pratt, F. L., Blundell, S. J., Lu, H., Singleton, J., Gawryluk, D., Turnbull, M. M., Krämer, K. W., Goddard, Paul and Lancaster, T. (2020) Magnetic order and disorder in a quasi-two-dimensional quantum Heisenberg antiferromagnet with randomized exchange. Physical Review B (Condensed Matter and Materials Physics), 102 (17). 174429 . doi:10.1103/PhysRevB.102.174429 ISSN 1098-0121.
|
PDF
WRAP-Magnetic-order-disorder-quasi-two-dimensional-quantum-Heisenberg-Goddard-2020.pdf - Accepted Version - Requires a PDF viewer. Download (4Mb) | Preview |
|
|
PDF
WRAP-Supplemental-Goddard-2020.pdf - Supplemental Material - Requires a PDF viewer. Download (1499Kb) | Preview |
Official URL: http://doi.org/10.1103/PhysRevB.102.174429
Abstract
We present an investigation of the effect of randomizing exchange coupling strengths in the S = 1/2 square lattice quasi-two-dimensional quantum Heisenberg antiferromagnet (QHAF) (QuinH)2Cu(ClxBr1−x)4·2H2O (QuinH = Quinolinium, C9H8N +), with 0 ≤ x ≤ 1. Pulsed-field magnetization measurements allow us to estimate an effective in-plane exchange strength J in a regime where exchange fosters short-range order, while the temperature TN at which long-range order (LRO) occurs is found using muon-spin relaxation, allowing us to construct a phase diagram for the series. We evaluate the effectiveness of disorder in suppressing TN and the ordered moment size and find an extended disordered phase in the region 0.4 . x . 0.8 where no magnetic order occurs. The observed critical substitution levels are accounted for by an energetics-based competition between different local magnetic orders. Furthermore, we demonstrate experimentally that the ground state disorder is driven by quantum effects of the exchange randomness, which is a feature that has been predicted theoretically and has implications for other disordered quasi-twodimensional QHAFs.
| Item Type: | Journal Article | |||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Subjects: | Q Science > QC Physics | |||||||||||||||||||||||||||
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | |||||||||||||||||||||||||||
| Library of Congress Subject Headings (LCSH): | Lattice theory, Antiferromagnetism, Quantum systems | |||||||||||||||||||||||||||
| Journal or Publication Title: | Physical Review B (Condensed Matter and Materials Physics) | |||||||||||||||||||||||||||
| Publisher: | American Physical Society | |||||||||||||||||||||||||||
| ISSN: | 1098-0121 | |||||||||||||||||||||||||||
| Official Date: | 17 November 2020 | |||||||||||||||||||||||||||
| Dates: |
|
|||||||||||||||||||||||||||
| Volume: | 102 | |||||||||||||||||||||||||||
| Number: | 17 | |||||||||||||||||||||||||||
| Article Number: | 174429 | |||||||||||||||||||||||||||
| DOI: | 10.1103/PhysRevB.102.174429 | |||||||||||||||||||||||||||
| Status: | Peer Reviewed | |||||||||||||||||||||||||||
| Publication Status: | Published | |||||||||||||||||||||||||||
| Access rights to Published version: | Restricted or Subscription Access | |||||||||||||||||||||||||||
| Copyright Holders: | ©2020 American Physical Society | |||||||||||||||||||||||||||
| Date of first compliant deposit: | 3 November 2020 | |||||||||||||||||||||||||||
| Date of first compliant Open Access: | 5 November 2020 | |||||||||||||||||||||||||||
| RIOXX Funder/Project Grant: |
|
Request changes or add full text files to a record
Repository staff actions (login required)
 |
View Item |
Downloads
Downloads per month over past year
