28 february 2012: lecture by Prof. Dr. Paul van Loosdrecht, University of Groningen - UHasselt
28 february 2012: lecture by Prof. Dr. Paul van Loosdrecht, University of Groningen
IMO-IMOMEC anounces the lecture by Prof. Dr. Paul van Loosdrecht of the Zernike institute for advanced materials, University of Groningen: 'Watching magnons fly: magnetic heat transport in quantum spin chain and quantum ladder compounds'
28 february 2012, 15:00-16:00h in aula H5, Hasselt University campus DiepenbeekAbstract:
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, a technique which will be discussed in some detail. In addition a more bulk sensitive optical transient diffusion technique will be discussed which among other can be used to directly measure phonon-spin equilibration times.
Contact UHasselt:
BOYEN Hans-Gerhard
