Oscillating magnetocaloric effect of a multilayer graphene

Abstract

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Magneto-oscillations on specific heat of graphene monolayer

“…Due to the crossing of the Landau level with the Fermi energy of the system, oscillations are found, in analogy to the de Haas-van Alphen effect, found on the magnetization of these materials 33 , and also on the magnetocaloric potentials [6][7][8][9][10][11][12][13][14][15] . Impurities, Coulomb interaction and phonons are also considered and deeply evaluated.…”

“…The thermodynamic potential of the two-dimensional electron gas in a quantized magnetic field can written as 7 :…”

“…In addition, the distance between Landau levels is very large (for example, the energy gap between the first two LLs in a magnetic field of 10 T is more than 1000 K). This leads to giant magnetooptical 3,4 and thermo-magnetic effects [5][6][7][8][9][10][11][12][13][14][15] , as well as to an unusual quantum Hall effect, which can be observed even at room temperature 1,[16][17][18] . Due to the valence of carbon ions and the gapless energy spectrum, the electronic density of states (DOS) of graphenes vanishes at the Fermi energy and therefore any further knowledge on this issue is useful for the scientific community.…”

Barocaloric effect on graphene

“…However, one special reason to justify the always fresh and renewed interest of the scientific community on graphene is the possibility of interplay of many of those outstanding, extraordinary properties. For instance, we can mention graphene plasmonics 5 , optoelectronics 6 , electro- 7 and magneto-caloric 8 , 9 effects. These last two are of great importance for the present article.…”

“…Few years ago, one of us reported the interesting caloric properties of a graphene sheet due to a change of either a magnetic or an electric field; and the results were the oscillating magnetocaloric 8 (OMCE) and electrocaloric 7 (OECE) effects, respectively. Few years later, a follow-up of these papers appeared, discussing the properties of the OMCE of a multilayer graphene 9 and applications into a six-stages thermodynamic cycle 10 .…”