Regensburg 2007 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 22: Low-dimensional Systems - Materials
TT 22.9: Vortrag
Donnerstag, 29. März 2007, 11:45–12:00, H18
Evidence for a magnetic phase transition in the frustrated spin-1/2 Heisenberg chain compound Li2ZrCuO4 — •Natalia Tristan1, Rüdiger Klingeler1, Hubertus Luetkens2, Hans-Henning Klauss3, Stefan-Ludwig Drechsler1, Yuri Skourski4, Olga Volkova5, Alexander Vasiliev5, Bernd Büchner1, and N. Leps1 — 1Leibniz-Institute for Solid State and MaterialsResearch, IFW-Dresden, 01171 Dresden, Germany — 2Laboratory for Muon-Spin Spectroscopy, PaulScherrer Institut, CH-5232 Villigen, Switzerland — 3Institute for Physics of Condensed Matter,Technical University Braunschweig, Germany — 4HighMagnetic Field Laboratory, FZ Dresden-Rossendorf, Germany — 5Physics Faculty, Moscow State University,Russia
The anomaly of unusual shape in the specific heat and the maximum in the derivative of the magnetic suseptibility dχ(T)/dT at around 6 K as well as magnetization behavior of the low dimensional Li2ZrCuO4 allude to onset of a long range order in this compound. This suggestion is also supported by results of muon spin relaxation performed on a powder sample of Li2ZrCuO4, which show a spontaneous muon spin precession below 5.75 K. A peculiar rectangular shape of the static field distribution in the ordered state is consistent with an incommensurate helical spin structure predicted theoretically.