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Regensburg 2013 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 40: Poster Session Correlated Electrons

TT 40.38: Poster

Wednesday, March 13, 2013, 15:00–19:00, Poster D

Exploring the Magnetic Phase Diagram of the Frustrated Chain Cuprate PbCuSO4(OH)2 - Linarite — •M. Schäpers1, A. U. B. Wolter1, F. Lipps1, V. Kataev1, S.-L. Drechsler1, S. Nishimoto1, R. Beyer2, M. Uhlarz2, J. Wosnitza2, B. Willenberg3,5, M. Reehuis3, K. C. Rule3, B. Ouladdiaf4, S. Süllow5, and B. Büchner11Leibniz-Institut IFW Dresden, Dresden, Germany — 2Dresden High Magnetic Field Laboratory, Dresden, Germany — 3HZB, Berlin, Germany — 4ILL, Grenoble, France — 5IPKM, TU Braunschweig, Braunschweig, Germany

We present a detailed experimental and theoretical study of the frustrated s = 1/2 spin-chain compound Linarite, PbCuSO4(OH)2, with competing nearest-neighbor and next-nearest-neighbor exchange interactions. Our experimental data are described using various theoretical approaches to obtain the magnetic exchange interactions resulting in a frustration ratio α ≈ 0.36 close to the 1D critical point [1]. ESR and NMR at elevated temperatures indicate a highly frustrated system with the onset of magnetic correlations far above the long range magnetic ordering temperature TN = 2.8 K. Below TN the ground state was found to be an elliptical, incommensurate spin spiral [2]. Linarite shows a multiplicity of magnetic field induced phases which could be identified by neutron- and NMR-measurements.

This work has partially been supported by the DFG under Contracts No. WO 1532/3-1 and No. SU229/10-1.
[1] A. U. B. Wolter et al., Phys. Rev. B. 85, 014407 (2012)
B. Willenberg et al., Phys. Rev. Lett. 108, 117202 (2012)

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