报告题目: |
Watching magnons fly Magnetic heat transport in quantum spin chain and spin ladder compounds |
报告人: |
Paul H.M. van Loosdrecht |
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Prof. Zernike Institute for Advanced Materials, University of Groningen,
The Netherlands
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报告时间: |
2010-04-09 14:00 |
报告地点: |
物理系三楼报告厅 |
主办单位: |
物理系 |
简介: |
摘要:
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 transient diffusion technique will be discussed. |
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