Large Negative Magnetoresistance of Intercalation Compound Mn _x TiS₂

Abstract

Abstract A relatively large negative magnetoresistance has been evidenced in intercalation compounds Mn x TiS2 (0 < x ≤ 0.25) from measurements up to 31 T at 1.8, 4.2, and 77 K. For low Mn concentration x ≤ 0.03, Mn 3d electrons are regarded as ‘localized’ spins with thermal fluctuation, while for higher concentration x > 0.03, a ‘Mn-derived band’ is formed near the Fermi energy. In the layered structure of Mn x TiS2, the carrier transport takes place along the host TiS2 layers and through the interlayer spaces via intercalated Mn atoms. The observed negative magnetoresistance can be reasonably explained by existing spin fluctuation theories.