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Berlin 2012 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 49: Correlated Electrons: Low-dimensional Systems - Materials 4

TT 49.4: Talk

Friday, March 30, 2012, 10:15–10:30, H 3005

Magnetic properties and revisited exchange integrals 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. Willenberg3,4, K. C. Rule3, S. Süllow4, and B. Büchner11Leibniz-Institut IFW Dresden, Dresden, Germany — 2Dresden High Magnetic Field Laboratory, Dresden, Germany — 3HZB für Materialien und Energie, Berlin, Germany — 4IPKM, TU Braunschweig, Braunschweig, Germany

We present a detailed experimental and theoretical study of the frustrated s = 12 spin-compound linarite, PbCuSO4(OH)2, with competing ferromagnetic nearest-neighbor and antiferromagnetic next-nearest-neighbor exchange interactions. Our experimental data are described using various theoretical approaches to obtain the magnetic exchange interactions. These main intrachain interactions are significantly larger as those derived previously [1, 2], causing a shift of the frustration ratio α ≈ 0.36 closer to the 1D critical point. ESR and NMR at elevated temperatures indicate a highly frustrated system with the onset of magnetic correlations far above the magnetic ordering temperature TN = 2.8 K into a spin spiral ground state. Linarite shows a complex magnetic phase diagram with small saturation field, which makes it a prototype for investigating the recently predicted spin multipolar order close to the saturation field for such spin-chain compounds.
M. Baran et al., Phys. Stat. Sol. (c) 3, 220 (2006).
Y. Yasui et al., JPSJ 80, 033707 (2011).

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