(2016) Data for Control of the third dimension in copper-based square-lattice antiferromagnets. [Dataset]

Archive (ZIP) (Dataset files) PRB 93 094430 (2016).zip - Published Version Download (876Kb)

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Abstract

Using a mixed-ligand synthetic scheme, we create a family of quasi-two-dimensional antiferromagnets, namely, [Cu(HF2)(pyz)2]ClO4 [pyz = pyrazine], [CuL2(pyz)2](ClO4)2 [L = pyO = pyridine-N-oxide and 4-phpy-O = 4-phenylpyridine-N-oxide. These materials are shown to possess equivalent two-dimensional [Cu(pyz)2]2+ nearly square layers, but exhibit interlayer spacings that vary from 6.5713 to 16.777 Å, as dictated by the axial ligands. We present the structural and magnetic properties of this family as determined via x-ray diffraction, electron-spin resonance, pulsed- and quasistatic-field magnetometry and muon-spin rotation, and compare them to those of the prototypical two-dimensional magnetic polymer Cu(pyz)2(ClO4)2. We find that, within the limits of the experimental error, the two-dimensional, intralayer exchange coupling in our family of materials remains largely unaffected by the axial ligand substitution, while the observed magnetic ordering temperature (1.91 K for the material with the HF2 axial ligand, 1.70 K for the pyO and 1.63 K for the 4-phpy-O) decreases slowly with increasing layer separation. Despite the structural motifs common to this family and Cu(pyz)2(ClO4)2, the latter has significantly stronger two-dimensional exchange interactions and hence a higher ordering temperature. We discuss these results, as well as the mechanisms that might drive the long-range order in these materials, in terms of departures from the ideal S=1/2 two-dimensional square-lattice Heisenberg antiferromagnet. In particular, we find that both spin-exchange anisotropy in the intralayer interaction and interlayer couplings (exchange, dipolar, or both) are needed to account for the observed ordering temperatures, with the intralayer anisotropy becoming more important as the layers are pulled further apart.

Item Type:	Dataset
Subjects:	Q Science > QC Physics Q Science > QD Chemistry
Divisions:	Faculty of Science, Engineering and Medicine > Science > Physics
Type of Data:	Multiple
Library of Congress Subject Headings (LCSH):	Crystal lattices, Antiferromagnetism
Publisher:	University of Warwick, Department of Physics
Official Date:	1 March 2016
Dates:	Date Event 1 March 2016 Completion
DOI:	10.1103/PhysRevB.93.094430
Status:	Not Peer Reviewed
Publication Status:	Published
Media of Output (format):	.txt .dat
Access rights to Published version:	Open Access (Creative Commons)
Description:	Figure 4, panel (a) hf2_0_41k.dat (black points) hf2_0_41k.tab (black line) pyo_0_1k.dat (red points) pyo_0_1K.tab (red line) phpy_0_26k.dat (green points) phpy_0_26k.fit (green line) clo4_0_34k.dat (blue points) clo4_0_34k.tab (blue line) Figure 4, panel (b) hf2_freq.dat (black points): columns 1,5,6 pyo_freq.dat (red points): columns 3,17,18 phpy_freq.dat (green points): columns 1,3,4 clo4_freq.dat (blue points): columns 1,5,6
Date of first compliant deposit:	25 August 2016
Date of first compliant Open Access:	25 August 2016
RIOXX Funder/Project Grant:	Project/Grant ID RIOXX Funder Name Funder ID UNSPECIFIED [EPSRC] Engineering and Physical Sciences Research Council http://dx.doi.org/10.13039/501100000266 DMR-1306158 National Science Foundation http://dx.doi.org/10.13039/100000001 DMR-1157490 National Science Foundation http://dx.doi.org/10.13039/100000001 UNSPECIFIED Florida. Department of State https://viaf.org/viaf/139521689 Science in 100 U.S. Department of Energy http://dx.doi.org/10.13039/100000015 UNSPECIFIED Science and Technology Facilities Council http://dx.doi.org/10.13039/501100000271 UNSPECIFIED Paul Scherrer Institut http://dx.doi.org/10.13039/501100004219
Related URLs:	Related item in WRAP
Open Access Version:	Other

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