Research Of Magnetic Two Dimensional Material CrSiTe₃

Ferromagnetic CrSiTe₃ and antiferromagnetic CrPS₄ single crystal were synthesized using flux method and chemical vapor transport method respectively.The crystals were characterized with X-ray diffraction（XRD）and Energy dispersive spectroscopy（EDS）.The magnetic properties and magneto-transport properties were characterized by the Superconducting Quantum Interference Device（SQUID）and Physical Properties Measurement System（PPMS）.Above the Curie temperature,short range magnetic orders still exist in single CrSiTe₃ and weak anti-localization phenomena was observed.Below the Curie temperature,as the effect of p-d interaction between Cr ions and Te elements,a positive magnetoresistance was observed under a high magnetic field.Two dimensional CrSiTe₃ was very sensitive to the temperature and degenerated at 120 ℃ in an ambient atmosphere while remaining stable at 160 ℃ in a Ar atmosphere for half an hour.Two dimensional CrSiTe₃ and CrPS₄ devices were successfully fabricated using UV-lithography method and the sample was developed with a cold developer.Electric transport measurement showed that CrPS₄ was insulator and CrSiTe₃ become insulator when cooled to 200 K.