Thermodynamic signatures of the field-induced states of graphite

D. LeBoeuf (), C. W. Rischau, G. Seyfarth, R. Küchler, M. Berben, S. Wiedmann, W. Tabis, M. Frachet, K. Behnia and B. Fauqué ()
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D. LeBoeuf: Laboratoire National des Champs Magnétiques Intenses (LNCMI-EMFL), CNRS, UGA, UPS, INSA
C. W. Rischau: ESPCI ParisTech, PSL Research University; CNRS; Sorbonne Universités, UPMC Univ. Paris 6
G. Seyfarth: Laboratoire National des Champs Magnétiques Intenses (LNCMI-EMFL), CNRS, UGA, UPS, INSA
R. Küchler: Max Planck Institute for Chemical Physics of Solids
M. Berben: Radboud University
S. Wiedmann: Radboud University
W. Tabis: Laboratoire National des Champs Magnétiques Intenses (LNCMI-EMFL), CNRS, UGA, UPS, INSA
M. Frachet: Laboratoire National des Champs Magnétiques Intenses (LNCMI-EMFL), CNRS, UGA, UPS, INSA
K. Behnia: ESPCI ParisTech, PSL Research University; CNRS; Sorbonne Universités, UPMC Univ. Paris 6
B. Fauqué: ESPCI ParisTech, PSL Research University; CNRS; Sorbonne Universités, UPMC Univ. Paris 6

Nature Communications, 2017, vol. 8, issue 1, 1-6

Abstract: Abstract When a magnetic field confines the carriers of a Fermi sea to their lowest Landau level, electron−electron interactions are expected to play a significant role in determining the electronic ground state. Graphite is known to host a sequence of magnetic field-induced states driven by such interactions. Three decades after their discovery, thermodynamic signatures of these instabilities are still elusive. Here we report the detection of these transitions with sound velocity measurements. The evolution of elastic constant anomalies with temperature and magnetic field allows to draw a detailed phase diagram which shows that the ground state evolves in a sequence of thermodynamic phase transitions. Our analysis indicates that the electron−electron interaction is not the sole driving force of these transitions and that lattice degrees of freedom play an important role.

Date: 2017
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DOI: 10.1038/s41467-017-01394-7

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