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Dresden 2011 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 22: CE: Low-dimensional Systems - Materials 2

TT 22.2: Talk

Tuesday, March 15, 2011, 10:45–11:00, HSZ 304

Magnetism in the Diamond Spin Chain Azurite — •Mathias Kraken1, Josefin Engelke1, Stefan Süllow1, Jochen Litterst1, Anja Wolter2, Bernd Wolf3, Michael Lang3, Chris Baines4, and Hubertus Luetkens41IPKM, TU Braunschweig, D-38106 Braunschweig, Germany — 2Institute for Solid State Research, IFW, D-01069 Dresden, Germany — 3Physikalisches Institut, J.W. Goethe Universität, D-60438 Frankfurt (Main), Germany — 4SµS, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland

Azurite is a mineral, which has been proposed as a model substance for a 1D spin-1/2-Heisenberg-diamond-chain. Specific heat [1] indicated a magnetic phase transition at 1.8K, where the coupling between the 1D Cu-chains sets in. At 0.5K indications of another phase transition, with yet unknown nature, were observed [3]. Due to the small magnetic moments and the complex structure of azurite, the magnetic ground state is yet not well understood.
We performed µSR measurements at PSI on a single crystal and a powdered sample, in extension of already published µSR-data [4]. Our measurements revealed a critical behaviour of the transversal damping approaching Tc as well as clear evidence of static magnetic order below Tc. The phase transition at 0.5K is observable as well, and can be related to an alteration in the local environment of the Cu2+ monomers.
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P.T. Cong et al., J. Phys.: Conf. Ser. 200, (2010).
M.C.R. Gibson et al., Phys. Rev. B 81, 140406 (2010).

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