Oscillating adiabatic temperature change of 2D diamagnetic materials

作者：Paixao L S^*; Alisultanov Z Z; Reis M S

来源：Journal of Magnetism and Magnetic Materials, 2014, 368: 374-378.

DOI：10.1016/j.jmmm.2014.06.010

• Magnetocaloric effect
• Graphene
• Thin film
• 2D electron gas

Studies on magnetocaloric effect generally concern ferromagnetic materials, due to their high magnetocaloric potential near phase transitions. Recently, this effect on diamagnetic materials was explored and oscillations on the entropy change observed as a consequence of the crossing of the Landau levels through the Fermi energy. The present paper explores the adiabatic temperature change in graphenes and thin films of non-relativistic diamagnetic materials and then compares the results with those from 3D diamagnets. Applying 101 of magnetic field, the temperature change of a gold thin film reaches 1 K, while for bulk gold the temperature change is smaller than 6 mK. For graphenes, the temperature change reaches 4 K with a field of similar to 1 T.

• 出版日期2014-11