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Spin gap in TI2Ru2O7 and the possible formation of haldane chains in three-dimensional crystals

Lee, S; Park, JG; Adroja, DT; Khomskii, D; Streltsov, S; McEwen, KA; Sakai, H; ... Ibberson, R; + view all (2006) Spin gap in TI2Ru2O7 and the possible formation of haldane chains in three-dimensional crystals. NAT MATER , 5 (6) 471 - 476. 10.1038/nmat1605.

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Abstract

Dimensionality is one of the most important parameters of physical phenomena. Only two things determine the universality class of a phase transition: the dimensionality of a given system and the symmetry of the order parameter. In most cases, the dimensionality of a substance is predetermined by its crystal structure. Examples in which the effective dimensionality is reduced are quite rare. Here we show that the three-dimensional cubic system of TI2Ru2O7 most probably evolves into a one-dimensional spin-one Haldane system with a spin gap below 120 K, accompanied by anomalies in the structure, resistivity and susceptibility. We argue that these anomalies are due to an orbital ordering of Ru 4d electrons, with a strong coupling among three degrees of freedom: orbital, spin and lattice. Our work provides a unique example of the spontaneous formation of Haldane system with an insight into the intriguing interplay of different degrees of freedom.

Type: Article
Title: Spin gap in TI2Ru2O7 and the possible formation of haldane chains in three-dimensional crystals
DOI: 10.1038/nmat1605
Keywords: TRANSITION, LOCALIZATION, PEROVSKITES, PYROCHLORE
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy
URI: http://discovery.ucl.ac.uk/id/eprint/9751
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