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Dietrich Wulferding
원자제어 저차원 전자계 연구단
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Lattice and orbital fluctuations in TiPO4

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Title
Lattice and orbital fluctuations in TiPO4
Author(s)
Dirk Wulferding; Moller, A.; Choi, K.Y.; Pashkevich, Y.G.; Babkin, R.Yu; Lamonova, K.V.; Lemmens, P.; Law, J.M.; Kremer, R.K.; Glaum, R.
Publication Date
2013-11
Journal
PHYSICAL REVIEW B, v.88, no.20, pp.205136 -
Publisher
AMER PHYSICAL SOC
Abstract
In the s = 1/2 antiferromagnetic spin chain material TiPO4, the formation of a spin gap takes place in a two-step process with two characteristic temperatures, T ∗ = 111 K and TSP = 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.
URI
http://pr.ibs.re.kr/handle/8788114/1563
DOI
10.1103/PhysRevB.88.205136
ISSN
1098-0121
Appears in Collections:
Center for Artificial Low Dimensional Electronic Systems(원자제어 저차원 전자계 연구단) > Journal Papers (저널논문)
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