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Temperature driven anomalous unit-cell c-axis shifts in highly oriented pyrolytic graphite measured at the magic-angle
- Boi, Filippo S., Liu, Mengjiao, Xia, JiaChen, Odunmbaku, Omololu, Taallah, Ayoub, Wen, Jiqiu
- Carbon 2019 v.145 pp. 690-693
- graphene, superconductivity, temperature
- Small misfit-angles in the grain boundary of HOPG interfaces have been recently reported to act as a source of unusual superconductive effects, with significant changes in the electronic-band-structure. These observations may imply that possible structural-transitions can exist with the variation of the temperature. In this letter we report the presence of temperature driven structural-transitions in the temperature range from 298.15 to 673.15 K measured under magic-angle HOPG (0.8°,±0.2°, first magic-angle). Novel memory effects consisting in an anomalous reversible linear increase of the c-axis unit cell values of HOPG with the increase of the temperature are described.