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Magnetic order and disorder in a quasi-two-dimensional quantum Heisenberg antiferromagnet with randomized exchange [dataset] Open Access
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(ClxBr(1-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-two-dimensional QHAFs.
Descriptions
- Resource type
- Dataset
- Contributors
- Creator:
Xiao, F.
1
Creator: Blackmore, W.J.A. 2
Creator: Huddart, B.M. 3
Creator: Gomilsek, M. 4
Creator: Hicken, T.J. 3
Creator: Baines, C 5
Creator: Baker, P.J. 6
Creator: Pratt, F.L. 6
Creator: Blundell, S.J. 7
Creator: Lu, H 8
Creator: Singleton, J 8
Creator: Gawryluk, D 5
Creator: Turnbull, M.M. 9
Creator: Krämer, K.W 1
Creator: Goddard, P.A 2
Creator: Lancaster, T 3
1 University of Bern, Switzerland
2 University of Warwick, UK
3 Durham University, UK
4 Jozsef Stefan Institute, Slovenia
5 Paul Scherrer Institut, Switzerland
6 STFC-ISIS Facility, UK
7 University of Oxford, UK
8 NHMFL, Los Alamos, USA
9 Clark University, USA
- Funder
-
Engineering and Physical Sciences Research Council
European Research Council
Science and Technology Facilities Council
Schweizerische Nationalfonds zur Förderung der Wissenschaftlichen Forschung
Javna Agencija za Raziskovalno Dejavnost RS
National Science Foundation
- Research methods
- Other description
- Keyword
- Antiferromagnetism
Exchange reaction
Molecular magenetism
Heisenberg model
Muon spin relaxation and rotation
- Subject
- Location
- Language
- English
- Cited in
- doi:10.1103/PhysRevB.102.174429
- Identifier
- ark:/32150/r1qz20ss53p
doi:10.15128/r1qz20ss53p
- Rights
- Creative Commons Attribution 4.0 International (CC BY)
- Publisher
-
Durham University
- Date Created
File Details
- Depositor
- T. Lancaster
- Date Uploaded
- 2 November 2020, 14:11:14
- Date Modified
- 17 February 2021, 14:02:15
- Audit Status
- Audits have not yet been run on this file.
- Characterization
-
File format: zip (ZIP Format)
Mime type: application/zip
File size: 13973132
Last modified: 2021:02:16 10:57:02+00:00
Filename: data.zip
Original checksum: 2b480a86a3f1f1b6fa1881f53cf0dbad
| User Activity | Date |
|---|---|
| User T. Lancaster has updated Magnetic order and disorder in a quasi-two-dimensional quantum Heisenberg antiferromagnet with randomized exchange [dataset] | about 3 years ago |
| User T. Lancaster has added a new version of Magnetic order and disorder in a quasi-two-dimensional quantum Heisenberg antiferromagnet with randomized exchange [dataset] | about 3 years ago |
| User T. Lancaster has updated Magnetic order and disorder in a quasi-two-dimensional quantum Heisenberg antiferromagnet with randomized exchange [dataset] | about 3 years ago |
| User T. Lancaster has updated Magnetic order and disorder in a quasi-two-dimensional quantum Heisenberg antiferromagnet with randomized exchange | over 3 years ago |
| User T. Lancaster has updated dummy.dat | over 3 years ago |
| User T. Lancaster has deposited dummy.dat | over 3 years ago |