Large negative magnetoresistance induced by anionic solid solutions in two-dimensional spin-frustrated transition metal chalcogenides

Yuqiao Guo; Jun Dai; Jiyin Zhao; Changzheng Wu; Dianqi Li; Lidong Zhang; Wei Ning; Mingliang Tian; Xiao Cheng Zeng; Yi Xie

doi:10.1103/PhysRevLett.113.157202

Large negative magnetoresistance induced by anionic solid solutions in two-dimensional spin-frustrated transition metal chalcogenides

Phys Rev Lett. 2014 Oct 10;113(15):157202. doi: 10.1103/PhysRevLett.113.157202. Epub 2014 Oct 6.

Authors

Yuqiao Guo¹, Jun Dai², Jiyin Zhao¹, Changzheng Wu¹, Dianqi Li¹, Lidong Zhang³, Wei Ning⁴, Mingliang Tian⁴, Xiao Cheng Zeng⁵, Yi Xie¹

Affiliations

¹ Hefei National Laboratory for Physical Sciences at Microscale and Collaborative Innovation Center of Chemistry for Energy Materials, University of Science and Technology of China, Hefei, Anhui 230026, China.
² Department of Chemistry, University of Nebraska-Lincoln, Lincoln, Nebraska 68588, USA.
³ National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, Anhui 230029, China.
⁴ High Magnetic Field Laboratory, Chinese Academy of Science, Hefei, Anhui 230031, China.
⁵ Hefei National Laboratory for Physical Sciences at Microscale and Collaborative Innovation Center of Chemistry for Energy Materials, University of Science and Technology of China, Hefei, Anhui 230026, China and Department of Chemistry, University of Nebraska-Lincoln, Lincoln, Nebraska 68588, USA.

PMID: 25375736
DOI: 10.1103/PhysRevLett.113.157202

Abstract

We report an anionic solid solution process that induces frustrated magnetic structures within two-dimensional transition metal chalcogenides, which leads to huge negative magnetoresistance effects. Ultrathin nanosheets of TiTe(2-x)I(x) solid solutions, which are a new class of inorganic two-dimensional magnetic material, exhibit negative magnetoresistance with a value of up to -85%, due to the spin-dependent scattering effects of local Ti(3+) 3d(1) moments that are antiferromagnetically coupled. Moreover, TiTe(2-x)I(x) serials show unique transport behaviors with continuous evolution from metallic to semiconducting states. We anticipate that anionic doping will be a powerful tool for optimizing the intrinsic physical properties of two-dimensional transition metal chalcogenide system.