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Spin gap in Tl$$_2$$Ru$$_2$$O$$_7$$ and the possible formation of Haldane chains in three-dimensional crystals

Lee, S.*; Park, J.-G.*; Adroja, D. T.*; Khomskii, D.*; Streltsov, S.*; McEwen, K. A.*; Sakai, Hironori  ; Yoshimura, Kazuyoshi*; Anisimov, V. I.*; Mori, Daisuke*; Kanno, Ryoji*; Ibberson, R.*

Here we show that the three-dimensional cubic system of Tl$$_2$$Ru$$_2$$O$$_7$$ 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.

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Category:Chemistry, Physical

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