Charge dynamics of 2H- TaSe2 along the less-conducting c-axis

We present an optical study of 2H-TaSe2 along the less conducting c-axis. This dichalcogenide compound belongs to a large class of conductors called "bad metals" (with a mean free path smaller than the lattice constant along the c-axis), which also includes the superconducting cuprates. Th...

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Bibliographic Details
Published in:Physical review letters 2001-04, Vol.86 (18), p.4136-4139
Main Authors: Ruzicka, B, Degiorgi, L, Berger, H, Gaál, R, Forró, L
Format: Article
Language:English
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Summary:We present an optical study of 2H-TaSe2 along the less conducting c-axis. This dichalcogenide compound belongs to a large class of conductors called "bad metals" (with a mean free path smaller than the lattice constant along the c-axis), which also includes the superconducting cuprates. The optical response shows the progressive development of a pseudogaplike feature with decreasing temperature. The spectral weight lost by the opening of such a pseudogap goes into the narrow Drude component, developing at low frequency and temperature. There is no violation of the sum rule in 2H-TaSe2 contrary to the cuprates.
ISSN:0031-9007
DOI:10.1103/PhysRevLett.86.4136