Regensburg 2013 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 17: Correlated Electrons: Spin Systems, Itinerant Magnets 2
TT 17.7: Topical Talk
Montag, 11. März 2013, 16:45–17:15, H19
Magnetic Frustration in a Quantum Spin Chain: The Case of Linarite PbCuSO4(OH)2 — •Anja U.B. Wolter1, Markus Schäpers1, Ferdinand Lipps1, Vladik Kataev1, Satoshi Nishimoto1, Stefan-Ludwig Drechsler1, Bernd Büchner1, Rico Beyer2, Marc Uhlarz2, Jochen Wosnitza2, Britta Willenberg3, Manfred Reehuis3, Kirrily C. Rule3, Bachir Ouladdiaf4, and Stefan Süllow5 — 1Leibniz-Institut IFW Dresden, Dresden, Germany — 2Dresden High Magnetic Field Laboratory, Dresden, Germany — 3Dresden High Magnetic Field Laboratory, Dresden, Germany — 4Institute Laue-Langevin, Grenoble, France — 5IPKM, TU Braunschweig, Braunschweig, Germany
We present a combined neutron diffraction, NMR and bulk thermodynamic study of the natural mineral linarite PbCuSO4(OH)2. An incommensurate magnetic ordering with a propagation vector k=(0,0.186,1/2) was found below TN=2.8 K in a zero magnetic field. The analysis of the neutron diffraction data yields an elliptical helical structure. From detailed investigations of linarite in magnetic fields up to 12 T, applied along the chain direction, a very rich magnetic phase diagram is established, with multiple field-induced phases, and possibly short-range-order effects occurring in high fields. Our data establish linarite as a model compound of the frustrated one-dimensional spin chain, with ferromagnetic nearest-neighbor and antiferromagnetic next-nearest-neighbor interactions. Long-range magnetic order is brought about by interchain coupling one order of magnitude smaller than the intrachain coupling.