Berlin 2018 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 72: Poster Session: Correlated Electrons
TT 72.93: Poster
Mittwoch, 14. März 2018, 15:00–19:00, Poster B
NMR study in the expected spin nematic state in Linarite — •Gaël Bastien1, Quentin Goutaland1, Hans Joachim Grafe1, Edwin Kermarrec2, Fabrice Bert2, Philippe Mendels2, Stefan Ludwig Drechsler1, Satoshi Nishimoto1, Stefan Süllow3, Kirrily Rule4, Anja U. B. Wolter1, and Bernd Büchner1 — 1Leibniz-Institut für Festkörper- und Werkstoffforschung (IFW) Dresden, Germany — 2Laboratoire de Physique des Solides, CNRS, Université Paris-Saclay, Orsay, France — 3Institute for Physics of Condensed Matter, TU Braunschweig, Germany — 4The Bragg Institute, ANSTO, Kirrawee DC, Australia
The J1−J2 Heisenberg chain is a frustrated magnetic system with competing first and second nearest neighbor interactions along a 1D chain. A new exotic state i.e. the spin nematic state is predicted to occur under magnetic field in this model. The linarite PbCuSO4(OH)2 is such a J1−J2 Heisenberg chain with a relatively low saturation field Hsat≈10T. It shows a long range magnetic spiral order below TN=2.7K. Under a magnetic field applied along the b axis, it is changed into a collinear antiferromagnetic state and then to a collinear spin density wave, which is finally suppressed around 9.4T. We perform NMR measurement in the spin density wave state and in the narrow field interval between this spin density wave state and the saturation down to dilution temperature, to measure both the NMR spectrum and the relaxation rate. The relaxation rate was also measured at higher temperature in the paramagnetic state to investigate the fluctuations around the expected spin nematic state.