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APS » Journals » Phys. Rev. Lett. » Volume 93 » Issue 2
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Phys. Rev. Lett. 93, 027005 (2004) [4 pages]

Magnon-Hole Scattering and Charge Order in Sr14-xCaxCu24O41

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C. Hess1,2,*, H. ElHaes2, B. Büchner2,3, U. Ammerahl4, M. Hücker4,5, and A. Revcolevschi4
1DPMC, Université de Genève, 1211 Genève, Switzerland
2Physikalisches Institut, RWTH-Aachen, 52056 Aachen, Germany
3Leibniz-Institute for Solide State and Materials Research, IFW-Dresden, 01171 Dresden, Germany
4Laboratoire de Physico-Chimie de l’État Solide, Université Paris-Sud, 91405 Orsay, France
5Physics Department, Brookhaven National Laboratory, Upton, New York 11973, USA

Received 9 September 2003; published 9 July 2004

The magnon thermal conductivity κmag of the hole-doped spin ladders in Sr14-xCaxCu24O41 has been investigated at low doping levels x. The analysis of κmag reveals a strong doping and temperature dependence of the magnon mean free path lmag, which is a local probe for the interaction of magnons with the doped holes in the ladders. In particular, this novel approach to studying charge degrees of freedom via spin excitations shows that charge ordering of the holes in the ladders leads to a freezing out of magnon-hole scattering processes.

© 2004 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.93.027005
DOI:
10.1103/PhysRevLett.93.027005
PACS:
74.72.Jt, 44.10.+i, 66.70.+f

*Electronic address: christian.hess@physics.unige.ch

 
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