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The CDW energy gap structure of TiSe 2 has been observed by tunnelling spectroscopy and its temperature dependence obtained for 77 K<or=T<or=295 K. In addition to the energy gap associated with the CDW with T c =201 K, a narrower gap structure was observed to persist at higher temperature, which explains the negative temperature coefficient of the rho -T curve above T c .
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Miyahara et al. (1995) studied this question.
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