Under ambient pressure, the cation radical salt (TMET-STF) 2 BF 4 , where the tight-binding band calculation suggests coexistence of one- and two-dimensional Fermi surfaces associated with two different conduction layers within the crystal, shows two types of resistivity anomalies around 115 and 13 K, followed by a superconducting transition at 4.1 K (onset).
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Kato et al. (1997) studied this question.
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