Optical evidence for a magnetically driven structural transition in the spin web $Cu_3TeO_6$

Details Optical evidence for a magnetically driven structural transition in the spin web $Cu_3TeO_6$ Optical evidence for a magnetically driven structural transition in the spin web $Cu_3TeO_6$

2005-10-07

arxiv.org/abs/cond-mat/0510186v1

Europhys. Lett. 75, 496 (2006)

Physics

Condensed Matter

Strongly Correlated Electrons

9 pages, 3 figures

Scientific paper

10.1209/epl/i2005-10603-3

$Cu_3TeO_6$ is a modest frustrated $S=1/2$ spin system, which undergoes an anti-ferromagnetic transition at $T_N\sim61$ $K$. The anti-ferromagnetic spin alignment in $Cu_3TeO_6$ below $T_N$ is supposed to induce a magneto-elastic strain of the lattice. The complete absorption spectrum of $Cu_3TeO_6$ is obtained through Kramers-Kronig transformation of the optical reflectivity, measured from the far-infrared up to the ultraviolet spectral range as a function of temperature ($T$). Below $T^*\sim 50$ $K$, we find a new mode at 208 $cm^{-1}$. The spectral weight associated to this additional mode increases as $\propto (T^*-T)^{1/2}$ with decreasing $T$ below $T^*$. The implication of the optical findings will be discussed in relation to the magnetic phase transition at $T_N$.

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