Charge Density Wave and Ferromagnetism in Intercalated CrSBr.

Area of Science:

• Condensed Matter Physics
• Materials Science
• Quantum Materials

Background:

• Electron-electron interactions in 1D electronic systems drive phenomena like spin-charge separation and charge density waves (CDW).
• Anisotropic magnetic semiconductors are sought after to explore coupled spin and charge dynamics in quantum states.

Purpose of the Study:

• To investigate the effects of chemical intercalation and electron doping on the magnetic and electronic properties of the van der Waals semiconductor CrSBr.
• To explore the potential for coupled spin-charge phenomena in a magnetic, anisotropic material.

Main Methods:

• Chemical intercalation of CrSBr with lithium and tetrahydrofuran.
• Characterization of the resulting material (Li_0.17(2)(tetrahydrofuran)_0.26(3)CrSBr) using various techniques to probe electronic and magnetic properties.

Main Results:

• Discovery of an electronically driven quasi-1D charge density wave (CDW) with an onset temperature above room temperature.
• Electron doping increased the magnetic ordering temperature from 132 K to 200 K.
• Switching of interlayer magnetic coupling from antiferromagnetic to ferromagnetic due to electron doping.
• Demonstration of intrinsic coupling between charge and spin due to spin-polarized anisotropic bands.

Conclusions:

• Li_0.17(2)(tetrahydrofuran)_0.26(3)CrSBr is an exfoliatable material exhibiting coexisting ferromagnetism and charge modulation.
• This material offers a promising platform for studying tunable quantum phenomena, including charge density waves and magnetism, across various temperatures and thicknesses.