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Sci Rep. 2016 Feb 18;6:21460. doi: 10.1038/srep21460.

Magnetic effects in sulfur-decorated graphene.

Author information

1
Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.
2
Department of Physics, Pusan National University, Busan 46241, Republic of Korea.
3
Department of Physics, University of California, Berkeley, CA 94720, USA.
4
Department of Materials Science and Engineering, University of California, Berkeley, CA 94720, USA.
5
Department of Physics, Pohang University of Science and Technology, Pohang 37673, Republic of Korea.
6
c_CCMR, Pohang University of Science and Technology, Pohang 37673, Republic of Korea.
7
MPPC_CPM, Pohang University of Science and Technology, Pohang 37673, Republic of Korea.
8
Instituto de Física, Universidade Federal do Rio de Janeiro, Caixa Postal 68528, 219410972 Rio de Janeiro RJ, Brazil.
9
Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.
10
Department of Physics, University of California, San Diego, CA 92093, USA.
11
Centre for Advanced 2D Materials, National University of Singapore, Singapore 117542.

Abstract

The interaction between two different materials can present novel phenomena that are quite different from the physical properties observed when each material stands alone. Strong electronic correlations, such as magnetism and superconductivity, can be produced as the result of enhanced Coulomb interactions between electrons. Two-dimensional materials are powerful candidates to search for the novel phenomena because of the easiness of arranging them and modifying their properties accordingly. In this work, we report magnetic effects in graphene, a prototypical non-magnetic two-dimensional semi-metal, in the proximity with sulfur, a diamagnetic insulator. In contrast to the well-defined metallic behaviour of clean graphene, an energy gap develops at the Fermi energy for the graphene/sulfur compound with decreasing temperature. This is accompanied by a steep increase of the resistance, a sign change of the slope in the magneto-resistance between high and low fields, and magnetic hysteresis. A possible origin of the observed electronic and magnetic responses is discussed in terms of the onset of low-temperature magnetic ordering. These results provide intriguing insights on the search for novel quantum phases in graphene-based compounds.

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