Lattice and orbital fluctuations in TiPO${}_{4}$

Lattice and orbital fluctuations in TiPO $_{4}$

Dirk Wulferding, Angela Möller, Kwang-Yong Choi, Yurii G. Pashkevich, Roman Yu. Babkin, Karina V. Lamonova, Peter Lemmens, Joseph M. Law, Reinhard K. Kremer, and Robert Glaum

Phys. Rev. B 88, 205136 – Published 25 November 2013

Abstract

In the $s = 1 / 2$ antiferromagnetic spin chain material TiPO $_{4}$ , the formation of a spin gap takes place in a two-step process with two characteristic temperatures, $T^{*} = 111$ K and $T_{SP} = 74$ K. We observe an unusual lattice dynamics over a large temperature regime as well as evidence for an orbital instability preceding the spin-Peierls transition. We relate different intrachain exchange interactions of the high temperature compared to the spin-Peierls phase to a modification of the orbital ordering pattern. In particular, our observation of a high-energy excitation of mixed electronic and lattice origin suggests an exotic dimerization process different from other spin-Peierls materials.

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Received 3 September 2013

DOI:https://doi.org/10.1103/PhysRevB.88.205136

Authors & Affiliations

Dirk Wulferding^1,2, Angela Möller³, Kwang-Yong Choi⁴, Yurii G. Pashkevich^5,6, Roman Yu. Babkin⁵, Karina V. Lamonova^5,6, Peter Lemmens¹, Joseph M. Law⁷, Reinhard K. Kremer⁸, and Robert Glaum⁹

¹Institute for Condensed Matter Physics, Technical University of Braunschweig, D-38106 Braunschweig, Germany
²Center for Artificial Low Dimensional Electronic Systems, Institute for Basic Science and Department of Physics, POSTECH, Pohang, 790-784, Korea
³Department of Chemistry and Texas Center for Superconductivity, University Houston, Houston, Texas 77204-5003, USA
⁴Department of Physics, Chung-Ang University, 221 Huksuk-Dong, Dongjak-Gu, Seoul 156-756, Republic of Korea
⁵A. A. Galkin Donetsk Phystech of the National Academy of Sciences of Ukraine, Donetsk 83114, Ukraine
⁶Donetsk National University, Donetsk 83001, Ukraine
⁷Dresden High Magnetic Field Laboratory, Helmholtz-Zentrum Dresden-Rossendorf, D-01314 Dresden, Germany
⁸Max-Planck-Institut für Festkörperforschung, Heisenbergstrasse 1, D-70569 Stuttgart, Germany
⁹Institut für Anorganische Chemie, Universität Bonn, D-53121 Bonn, Germany

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Vol. 88, Iss. 20 — 15 November 2013

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