Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2011-03-05
J. Phys.: Condens. Matter 23 (2011) 164211
Physics
Condensed Matter
Strongly Correlated Electrons
19 pages, 6 figures; to appear in: J. Phys.: Condens. Matter (special issue on geometrically frustrated magnetism)
Scientific paper
10.1088/0953-8984/23/16/164211
The natural mineral azurite Cu3(CO3)2(OH)2 is an interesting spin-1/2 quantum antiferromagnet. Recently, a generalised diamond chain model has been established as a good description of the magnetic properties of azurite with parameters placing it in a highly frustrated parameter regime. Here we explore further properties of this model for azurite. First, we determine the inelastic neutron scattering spectrum in the absence of a magnetic field and find good agreement with experiments, thus lending further support to the model. Furthermore, we present numerical data for the magnetocaloric effect and predict that strong cooling should be observed during adiabatic (de)magnetisation of azurite in magnetic fields slightly above 30T. Finally, the presence of a dominant dimer interaction in azurite suggests the use of effective Hamiltonians for an effective low-energy description and we propose that such an approach may be useful to fully account for the three-dimensional coupling geometry.
Honecker Andreas
Hu Shijie
Peters Robert
Richter Johannes
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