Optical evidence for a magnetically driven structural transition in the spin web $C{u}_{3}Te{O}_6$

Abstract

$C{u}_{3}Te{O}_6$ is a modest frustrated $S=1/2$ spin system, which undergoes an anti-ferromagnetic transition at $T_N\sim 61$ $K$. The anti-ferromagnetic spin alignment in $C{u}_{3}Te{O}_6$ below $T_N$ is supposed to induce a magneto-elastic strain of the lattice. The complete absorption spectrum of $C{u}_{3}Te{O}_6$ 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 $T^{\ast }\sim 50$ $K$, we find a new mode at 208 $c{m}^{-1}$. The spectral weight associated to this additional mode increases as $\propto (T^{\ast }-T{)}^{1/2}$ with decreasing $T$ below $T^{\ast }$. The implication of the optical findings will be discussed in relation to the magnetic phase transition at $T_N$.

9 pages, 3 figures

References in corpus (2)

• Emergent excitations in a geometrically frustrated magnet
• Magnetic light scattering in low-dimensional quantum spin systems

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