guest ::
| Home > Publications database > Low-temperature structural investigations of the frustrated quantum antiferromagnets ${\mathrm{Cs}}_{2}\mathrm{Cu}\left({\mathrm{Cl}}_{4-x}{\mathrm{Br}}_{x}\right)$ |
| Home > Publications database > Low-temperature structural investigations of the frustrated quantum antiferromagnets ${\mathrm{Cs}}_{2}\mathrm{Cu}\left({\mathrm{Cl}}_{4-x}{\mathrm{Br}}_{x}\right)$ |
| Journal Article | FZJ-2015-01475 |
; ; ; ; ; ; ; ; ; ; ;
2015
APS
College Park, Md.
This record in other databases: 
Please use a persistent id in citations: http://hdl.handle.net/2128/8426 doi:10.1103/PhysRevB.91.035124
Abstract: Powder x-ray diffraction (PXRD) and single-crystal neutron scattering were used to study in detail the structural properties of the Cs2Cu(Cl4−xBrx) series, good realizations of layered triangular antiferromagnets. Detailed temperature-dependent PXRD reveal a pronounced anisotropy of the thermal expansion for the three different crystal directions of the orthorhombic structure without any structural phase transition down to 20 K. Remarkably, the anisotropy of the thermal expansion varies for different x, leading to distinct changes of the geometry of the local Cu environment as a function of temperature and composition. The refinement of the atomic positions confirms that for x=1 and 2, the Br atoms occupy distinct halogen sites in the [CuX4] tetrahedra (X = Cl, Br). The precise structure data are used to calculate the magnetic exchange couplings using density functional methods for x=0. We observe a pronounced temperature dependence of the calculated magnetic exchange couplings, reflected in the strong sensitivity of the magnetic exchange couplings on structural details. These calculations are in good agreement with the experimentally established values for Cs2CuCl4 if one takes the low-temperature structure data as a starting point.
Keyword(s): Magnetic Materials (1st) ; Magnetism (2nd) ; Condensed Matter Physics (2nd) ; Crystallography (2nd)
; 
; 
; Current Contents - Physical, Chemical and Earth Sciences ; IF < 5 ; JCR ; Nationallizenz
; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection
|
The record appears in these collections: |
PDF
Fulltext by OpenAccess repository