Abstract
The natural mineral azurite Cu3(CO3)2(OH)2 is an interesting spin-1/2 quantum antiferromagnet. Recently, a generalized diamond chain model has beenestablished as a good description of the magnetic properties of azurite with parametersplacing it in a highly frustrated parameter regime. Here we explore further properties ofthis model for azurite. First, we determine the inelastic neutron scattering spectrum in theabsence of a magnetic field and find good agreement with experiments, thus lendingfurther support to the model. Furthermore, we present numerical data for themagnetocaloric effect and predict that strong cooling should be observed during adiabatic(de)magnetization of azurite in magnetic fields slightly above 30 T. Finally, the presence ofa dominant dimer interaction in azurite suggests the use of effective Hamiltoniansfor an effective low-energy description and we propose that such an approachmay be useful for fully accounting for the three-dimensional coupling geometry.
Highlights
On the one hand, highly frustrated magnets constitute a fascinating field of research since the competition of different interactions give rise to many exotic phenomena
We present numerical data for the magnetocaloric effect and predict that strong cooling should be observed during adiabaticmagnetisation of azurite in magnetic fields slightly above 30T
A consistency check on this picture is obtained by the lower edge of the one-third plateau which is located at Hc1 = 13.32K according to numerical data for the generalised diamond chain model with the parameters (1) [69]
Summary
Highly frustrated magnets constitute a fascinating field of research since the competition of different interactions give rise to many exotic phenomena (see for example [1]). A famous example is the exact dimer ground state of the twodimensional Shastry-Sutherland model for SrCu2(BO3) (see [3] for a review) Another case of such exact eigenstates are the ground states which can be constructed exactly in terms of localised magnons in the high-field regime of certain highly frustrated quantum magnets [4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22].
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