Anomalous Correlation Functions in Low-Dimensional Oxides : An Effect of Orbital Degrees of Freedom?(Spin, Orbital, Charge and Lattice Coupled Systems, Field-Induced Phase Transitions and Dynamics in Quantum Spin Systems)

概要

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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-T_c 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 Sr_<14>Cu_<24>O_<41> and on the quasi-2D helimagnet BaCo_2As_2O_8.
理論物理学刊行会の論文
2005-10-31