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TT: Fachverband Tiefe Temperaturen
TT 6: Superconductivity: Properties and Electronic Structure
TT 6.11: Talk
Monday, March 7, 2016, 12:45–13:00, H19
High temperature superconductivity and flat bands in graphite: state of the art — Christian Precker1, •Pablo Esquinazi1, Ana Champi2, Santiago Munoz1, Jose Barzola-Quiquia1, Israel Lorite1, and Winfried Böhlmann1 — 1Division of Superconductivity and Magnetism, University of Leipzig, Linnéstraße 5, 04103 Leipzig, Germany — 2Universidade Federal do ABC, Rua Santa Delia 166, 09210-170, Santo Andre, SP, Brazil
In this experimental work we studied the magneto-transport properties of natural graphite samples from a mine in Brazil. The reason for the study of these samples is the existence of well-defined, large 2D interfaces inside the samples. The observed huge magnetic field driven metal-insulator transition (MIT) is directly related to the existence of internal interfaces. Previous experimental results as well as theoretical work suggest the existence of granular superconductivity at certain interfaces between twisted Bernal stacking ordered regions or between rhombohedral and Bernal regions. We present results that indicate the existence of a transition in the electrical resistance at T ≳ 320 K. The observed irreversibility in the magnetoresistance at low magnetic fields and other transport details suggest the existence of superconducting paths at such high temperatures.