Metal-insulator transition in Mott-insulator FePS3

Abstract

We have prepared single crystal of layered Mott-insulator FePS3 and investigated the pressure dependence of the electrical resistivity. FePS3 shows a metal-insulator transition between 10 and 11 GPa. In the insulating region, the activation energy increases continuously with decreasing the pressure and it is well extrapolated to the ambient pressure value. In the metallic region, the electrical resistivity is propotional to the square of the temperature within 50 to 100 K.

Low‐Frequency Electronic Noise in Quasi‐2D van der Waals Antiferromagnetic Semiconductor FePS3—Signatures of Phase Transitions

“…Similar temperature dependence of resistivity in such material has been reported previously. [11,62] For additional I-V characteristics, close to the Néel transition temperature T N = 118 K, see Figure S3 in the Supporting Information.…”

“…Previously, this temperature was identified as a possible Mott metal-insulator transition point for FePS 3 . [11,62] The latter was established via measurements that involved an application of high pressure. [11,62] One would expect a noise increase at the metal-insulator transition.…”

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These layered quasi-2D van der Waals (vdW) compounds have interesting electronic, optical, and magnetic properties that can offer new device functionalities. [7][8][9][10][11][12][13][14][15][16][17][18][19] It has been demonstrated that some MPX 3 thin films are one of the rare few-layer vdW materials, which can have stable intrinsic antiferomagnetism (AF) even at mono-and few layer thicknesses. [20][21][22] The existence of weak vdW bonds between the MPX 3 layers makes them potential candidates for the 2D spintronic devices.

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Quasi-two-dimensional magnon identification in antiferromagneticFePS3via magneto-Raman spectroscopy

“…The choice of transition metal results in varied magnetic phenomena, since the spins align antiferromagnetically in different fashions, including Néel, zigzag, or stripe ordering. 28,29 FePS3, which is a Mott insulator, 30,31 is especially intriguing as a 2D Ising antiferromagnet on a honeycomb lattice. 27,32 In addition, long-distance magnon transport (several micrometers) has been experimentally observed in MnPS3, demonstrating that these materials are viable candidates for future magnonic devices.…”

Metallic Hydrogen

“…47 If LOD's interpretation is correct, their sample should be transparent in the visible region. 48 Their sample is black and nontransparent, even at lower pressures. There are further problems.…”