Regensburg 2010 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 5: CE: Low-dimensional Systems - Materials 1
TT 5.7: Vortrag
Montag, 22. März 2010, 16:00–16:15, H18
Consequence of the intra-chain dimer-monomer spin frustration and the inter-chain dimer-monomer spin exchange in the diamond-chain compound Azurite Cu3(CO3)2(OH)2 — •R. K. Kremer1, J. Kang2, C. Lee2, and M.-H. Whangbo2 — 1Max-Planck-Institut für Festkörperforschung, Stuttgart, Germany — 2Department of Chemistry, North Carolina State University, Raleigh, North Carolina 27695-8204
The spin lattice appropriate for Azurite Cu3(CO3)2(OH)2 was determined by evaluating its spin exchange interactions on the basis of first principles density functional calculations. It is found that Azurite cannot be described by an isolated diamond chain with no spin frustration, but by a two-dimensional spin lattice in which diamond chains with spin frustration interact through the interchain spin exchange in the ab-plane.[1] Our analysis indicates that the magnetic properties of Azurite at low temperatures can be approximated by two independent contributions, i.e., an isolated dimer and an effective uniform chain contributions. This prediction was verified by analyzing the magnetic susceptibility and specific heat data of Azurite.
[1] J. Kang, et al. J. Phys. Cond. Matter 21 392201 (2009).