Dresden 2014 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 10: Spin-dependent Transport Phenomena

MA 10.10: Vortrag

Montag, 31. März 2014, 17:30–17:45, HSZ 403

Magnon-phonon dynamics in the heat transport in low dimensional quantum antiferromagnetic cuprates. — •Matteo Montagnese¹, Ekaterina Khadikova², Xenophon Zotos³, Oleg Mityashkin⁴, Christian Hess⁴, Alexandre Revcolevschi⁵, Romuald Saint-Martin⁵, and Paul H M van Loosdrecht¹ — ¹II. Physikalisches Institut der Universität zu Köln, D-50937 Köln, Germany — ²Zernike Institute for Advanced Materials, Rjiksuniversiteit Groningen, Groningen, Tmohe Netherlands — ³Department of Physics, University of Crete and Foundation for Research and Technology-Hellas, 71003 Heraklion, Greece — ⁴IFW-Dresden, Institute for Solid State Research, D-01171 Dresden, Germany — ⁵Laboratoire de Physico-Chimie de L'Etat Solide, ICMMO, UMR8182, Université Paris-Sud, 91405 Orsay CEDEX, France

Low dimensional cuprate antiferromagnets such as the spin chain SrCuO2 and the spin ladder Ca9La5Cu24O41 are notable for their quantum disordered ground state and their intriguing magnetic excitation spectrum . Moreover, they show an unusual magnon-dominated thermal conduction over a wide temperature range, partly due to extremely long magnetic mean free paths, eventually in the micron range. At the same time, space and time-resolved optics is emerging as an optimal tool to probe thermal transport at the microscale. We have applied different space- and time-resolved optical methods to study the magnetic thermal transport dynamic, aiming at detecting its ballistic component and clarifying the kinetics and interaction of AFM excitations in low dimensions.