Spin-Peierls transition in TiPO$_4$

Details Spin-Peierls transition in TiPO$_4$ Spin-Peierls transition in TiPO$_4$

2011-04-26

arxiv.org/abs/1104.4922v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 3 figures, accepted by Phys. Rev. B as a Rapid Communication

Scientific paper

We investigated the magnetic and structural properties of the quasi-one dimensional 3$d^1$-quantum chain system TiPO$_4$ ($J \sim$ 965 K) by magnetic susceptibility, heat capacity, ESR, x-ray diffraction, NMR measurements, and by density functional calculations. TiPO$_4$ undergoes two magnetostructural phase transitions, one at 111 K and the other at 74 K. Below 74 K, NMR detects two different $^{31}$P signals and the magnetic susceptibility vanishes, while DFT calculations evidence a bond alternation of the Ti...Ti distances within each chain. Thus, the 74 K phase transition is a spin-Peierls transition which evolves from an incommensurate phase existing between 111 K and 74 K.

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