Spontaneous breaking of isotropy observed in the electronic transport of rare-earth tritellurides

A.A. Sinchenko; P.D. Grigoriev; P. Lejay; P. Monceau

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Spontaneous breaking of isotropy observed in the electronic transport of rare-earth tritellurides

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arxiv 1310.8136 v1 pith:ACKJ7FNY submitted 2013-10-30 cond-mat.str-el

A.A. Sinchenko , P.D. Grigoriev , P. Lejay , P. Monceau This is my paper

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keywords waveconductivitydirectionrare-earthtransitionvectora-axisangle-resolved

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We show that the isotropic conductivity in the normal state of rare-earth tritelluride RTe_3 compounds is broken by the occurrence of the unidirectional charge density wave (CDW) in the (a,c) plane below the Peierls transition temperature. In contrast with quasi-one-dimensional systems, the resistivity anomaly associated with the CDW transition is strong in the direction perpendicular to the CDW wave vector Q (a-axis) and very weak in the CDW wave vector Q direction (c-axis). We qualitatively explain this result by calculating the electrical conductivity for the electron dispersion with momentum-dependent CDW gap as determined by angle-resolved photoemission spectroscopy (ARPES).

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