Charge density waves and superconductivity in 2H-TaSe2

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Charge density waves (CDW) in 2H-TaSe2 were studied by use of an ultra-low temperature STM over a wide temperature range between 90 mK and 300 K. The superlattice structure due to formation of the commensurate CDW was clearly seen below 90 K in atomically resolved STM images, which is consistent with a band calculation. Besides a known CDW energy gap of 80 meV a new small gap structure of a few meV width in the vicinity of the Fermi level was observed in tunneling spectroscopy data at low temperatures. Superconductivity in 2H-TaSe2 (Tc≈200 mK) studied by resistivity measurements is also discussed.

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