Insulator-metal transition and crossover from negative to positive magnetoresistance in Cu2IrO3 under high pressure

Jin，Cheng1; Wang，Yonggang1; Jin，Meiling2; Jiang，Zimin1; Jiang，Dequan1; Li，Junlong1; Nakamoto，Yuki3; Shimizu，Katsuya3; Zhu，Jinlong1,2

2022-04-01

10.1103/PhysRevB.105.144402

Physical Review B   影响因子和分区

2469-9950

2469-9969

Quantum spin liquid (QSL) state has attracted a great deal of attention as a precursor of high-temperature superconductor. The promising QSL candidates such as α-RuCl3, Na2IrO3 and α-Li2IrO3 with honeycomb structure are insulators or semiconductors. An insulator-metal transition (IMT) is necessary for hosting superconducting state. However, all of them have a robust insulating state, even under pressure. Here, an alternative candidate of QSL, Cu2IrO3 is investigated under high pressure and low temperature through x-ray diffraction and electric properties measurement. A dimerization occurs at 7.1 GPa which is similar to α-RuCl3 and α-Li2IrO3, accompanied with an anomaly of resistance at ∼5.0GPa. The IMT appears under a pressure of ∼13.8GPa, which is absent in α-RuCl3, Na2IrO3 and α-Li2IrO3 under pressure. It is related to the crystal structure transition at ∼11.1GPa, which induces the decline of interlayer distance. Furthermore, a strange crossover from negative to positive magnetoresistance is observed under pressure of 21.8 to 24.2 GPa at 2 K. This may be due to the valence change of Cu+ to Cu2+, as a result of the decreasing of interlayer distance and the shortening of O-Cu-O bond under pressure.

EI

英语

其他

20221612005583

Chlorine compounds ; Copper compounds ; High temperature superconductors ; Honeycomb structures ; Iridium compounds ; Magnetoresistance ; Metal insulator transition ; Quantum theory ; Ruthenium compounds ; Sodium compounds ; Temperature

Structural Members and Shapes:408.2 ; Thermodynamics:641.1 ; Magnetism: Basic Concepts and Phenomena:701.2 ; High Temperature Superconducting Materials:708.3.1 ; Quantum Theory; Quantum Mechanics:931.4 ; Crystal Lattice:933.1.1

PHYSICS

2-s2.0-85128388791

Scopus

1.Center for High Pressure Science and Technology Advanced Research (HPSTAR),Beijing,100094,China
2.Department of Physics,Southern University of Science and Technology,Shenzhen,518055,China
3.Center for Science and Technology under Extreme Conditions,Graduate School of Engineering Science,Osaka University,Osaka,1-3 Machikaneyama-Cho, Toyonaka,560-8531,Japan

Jin，Cheng,Wang，Yonggang,Jin，Meiling,et al. Insulator-metal transition and crossover from negative to positive magnetoresistance in Cu2IrO3 under high pressure[J]. Physical Review B,2022,105(14).

Jin，Cheng.,Wang，Yonggang.,Jin，Meiling.,Jiang，Zimin.,Jiang，Dequan.,...&Zhu，Jinlong.(2022).Insulator-metal transition and crossover from negative to positive magnetoresistance in Cu2IrO3 under high pressure.Physical Review B,105(14).

Jin，Cheng,et al."Insulator-metal transition and crossover from negative to positive magnetoresistance in Cu2IrO3 under high pressure".Physical Review B 105.14(2022).