Observation of itinerant ferromagnetism and coupled magnetoresistance in a spinel CuCo2S4

Zengji Yue, Zhiqian Hou, Frank Yun, Peng Liu, Guangsai Yang, Abdulhakim Bake, Weiyao Zhao, David Cortie, Chaozhu Shu, Shaojie Hu, Jipeng Cheng, Xiaolin Wang

Research output: Contribution to journalArticlepeer-review

Abstract

We report the existence of ferromagnetism in the thiospinel compound CuCo2S4withTc∼ 125 K. The magneto-electronic transport of the CuCo2S4demonstrates a metallic conductivity and positive magnetoresistance at high temperature. At low temperature, in the ferromagnetic state, there is evidence of spin-transport coupling with magnetic domains giving a region of negative magnetoresistance near the coercive field. The electronic band structure of CuCo2S4was calculated using density-functional theory (DFT), which shows a ferromagnetic metallic state, in agreement with experiment. With nickel doping, both the spinel CuCo1.5Ni0.5S4and CuCoNiS4display paramagnetism down to the lowest measured temperature (3 K). This indicates that, as in other itinerant magnetic sulfides, the exchange interactions are highly sensitive to electron/hole doping. The tunable magnetism in the spinel CuCo2S4, together with its high conductivity, suggests that this thiospinel material could be a candidate for spintronic applications.

Original languageEnglish
Pages (from-to)8874-8881
Number of pages8
JournalJournal of Materials Chemistry C
Volume9
Issue number28
DOIs
Publication statusPublished - Jul 28 2021
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Chemistry

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