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Temperature dependence of the charge-density-wave energy gap on InCu(001)

S. Hatta, H. Okuyama, M. Nishijima, and T. Aruga
Phys. Rev. B 71, 041401(R) – Published 3 January 2005

Abstract

A charge-density-wave (CDW) phase transition on InCu(001) with In coverage of 0.63 ML has been studied with angle-resolved photoelectron spectroscopy. Because of the quasi-two-dimensional electronic structure, the upper and lower bands of the CDW ground state were observed at a k point slightly offset from kF of the high-temperature phase. The two bands transformed to a metallic band at 405 K. Tracing the upper-band minimum and the lower-band maximum, we determined the temperature dependence of the CDW order parameter. The dependence indicates that the electronic entropy plays an important role in the transition. We discuss the enhanced contribution of electronic entropy to the free energy due to underlying bulk metallic states.

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  • Received 7 September 2004

DOI:https://doi.org/10.1103/PhysRevB.71.041401

©2005 American Physical Society

Authors & Affiliations

S. Hatta, H. Okuyama, M. Nishijima, and T. Aruga*

  • Department of Chemistry, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan

  • *Email address: aruga@kuchem.kyoto-u.ac.jp

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Issue

Vol. 71, Iss. 4 — 15 January 2005

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