Artículos de revistas
Extraordinary Magnetoresistance In Graphite: Experimental Evidence For The Time-reversal Symmetry Breaking.
Registro en:
Journal Of Physics. Condensed Matter : An Institute Of Physics Journal. v. 25, n. 46, p. 466004, 2013-Nov.
1361-648X
10.1088/0953-8984/25/46/466004
24158733
Autor
Kopelevich, Y
da Silva, R R
Camargo, B C
Alexandrov, A S
Institución
Resumen
We report a highly anisotropic in-plane magnetoresistance (MR) in graphite that possesses in-plane parallel line-like structural defects. In a current direction perpendicular to the line defects (LD), MR is negative and linear in low fields with a crossover to a positive MR at higher fields, while in a current direction parallel to LD, we observed a giant super-linear positive MR. These extraordinary MRs are respectively explained by a hopping magnetoresistance via non-zero angular momentum orbitals, and by the magnetoresistance of inhomogeneous media. The linear negative orbital MR is a unique signature of the broken time-reversal symmetry (TRS). We discuss the origin of the disorder-induced TRS-breaking in graphite. 25 466004