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MA: Fachverband Magnetismus

MA 28: Focused Session: Spin Transport and Coherence in Emerging Materials

MA 28.3: Topical Talk

Mittwoch, 25. März 2009, 15:45–16:15, HSZ 101

Visualizing heat transport in quantum magnets — Marian Otter¹, Dmitry Fishman¹, Viktor V. Krashnikov¹, Maxim S. Pshenichnikov¹, Romualt Saint-Martin², Alexander Revcolevschi², and •Paul H.M. van Loosdrecht¹ — ¹Zernike Institute for Advanced Materials, Nijenborgh 4, 9747 AG Groningen, The Netherlands — ²Laboratoire de Chimie des Solides, Universite& Paris-Sud, 91405 Orsay Cedex, France

Low dimensional quantum magnets show an unusually high thermal conductivity originating from the magnetic excitations in these compounds. The conductivity is highly anisotropic and dwarfs the usual phonon contribution, making low dimensional quantum magnets highly relevant for heat management in electronic devices. The present work focuses on optical methods to study and control the heat conduction in magnetically low dimensional cuprate systems as for instance found in the magnetic chain compounds SrCuO2 and Sr2CuO3, and the so-called telephone number ladder compounds (La,Sr,Ca)14Cu24O41. Magnon heat conduction can be visualized using time resolved luminescence microscopy techniques, yielding direct information on both the magnitude and the anisotropy of the heat diffusion in these materials, even when in thin film form. In addition a more bulk sensitive optical 'time of flight' technique will be discussed.

This work is supported by the NOVMAG EU-FP6 project (proj. nr. 032980, www.novmag.eu)