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Progress of Theoretical Physics
Supplement No.159 (2005) pp. 338-348
URL : http://ptp.ipap.jp/link?PTPS/159/338/
DOI : 10.1143/PTPS.159.338

Anomalous Correlation Functions in Low-Dimensional Oxides: An Effect of Orbital Degrees of Freedom?

Louis-Pierre Regnault,1,* Cyrille Boullier,1 Eric Ressouche,1 Nolwenn Kernavanois,2 Emilio Lorenzo3 and Jean Yves Henry1

1CEA-Grenoble, DRFMC-SPSMS, 17 rue des Martyrs, 38054 Grenoble Cedex 9, France
2Institut Laue Langevin, 6 rue Jules Horowitz, 38041 Grenoble Cedex 9, France
3Laboratoire de cristallographie, CNRS, 38042 Grenoble Cedex 9, France

It is now well admitted that the orbital degrees of freedom play an important role in the occurrence of non-conventional properties in many low-dimensional highly-correlated electron systems. Thus, in quasi-2D high-Tc cuprates the existence of staggered orbital currents has been invoked to explain the peculiarities of the pseudo-gap phase. In these materials, the quantitative understanding requires to take into account the multi-spin exchange interactions, as well. Among other effects, electron circulations or exchanges should give rise to anomalous magnetic correlation functions, which can be accurately investigated by means of polarized neutron scattering. This will be illustrated by recent studies carried out on the spin-ladder Sr14Cu24O41 and on the quasi-2D helimagnet BaCo2As2O8.


*E-mail: regnault@ill.fr


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