Volume 75, Number 3, August 2006
|Page(s)||496 - 502|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||30 June 2006|
Optical evidence for a magnetically driven structural transition in the spin web
Laboratorium für Festkörperphysik, ETH Zürich - CH-8093 Zürich, Switzerland
2 Institut de Physique de la Matière Complexe (IPMC), EPF Lausanne CH-1015 Lausanne, Switzerland
Accepted: 9 June 2006
Cu3TeO6 is a modest frustrated spin system, which undergoes an antiferromagnetic transition at K. The antiferromagnetic spin alignment in Cu3TeO6 below TN is supposed to induce a magneto-elastic strain of the lattice. The complete absorption spectrum of Cu3TeO6 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 K, we find a new mode at 208 cm-1. The spectral weight associated to this additional mode increases as with decreasing T below T*. The implication of the optical findings will be discussed in relation to the magnetic phase transition at TN.
PACS: 78.20.-e – Optical properties of bulk materials and thin films / 75.50.Ee – Antiferromagnetics / 75.30.Gw – Magnetic anisotropy
© EDP Sciences, 2006
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