Ferromagnetism in layered metastable 1T-CrTe2

Area of Science:

• Materials Science
• Condensed Matter Physics
• Solid State Chemistry

Background:

• The synthesis of novel metastable transition metal dichalcogenides is crucial for exploring new material properties.
• Understanding the magnetic and electronic behavior of chromium tellurides is of significant interest.

Purpose of the Study:

• To synthesize and characterize the previously unknown metastable 1T-CrTe2 compound.
• To investigate its structural, magnetic, electronic, and thermal properties.
• To elucidate the nature of its observed ferromagnetism.

Main Methods:

• Synthesis of 1T-CrTe2.
• Complete structural characterization using X-ray diffraction.
• Measurements of magnetization, specific heat, and electrical resistivity from 4 K to 330 K.
• Density Functional Theory (DFT) based band structure calculations.

Main Results:

• Successful synthesis of the metastable 1T-CrTe2 compound, crystallizing in the CdI2 structure type.
• Observed metallic behavior in electrical resistivity below room temperature.
• Ferromagnetic transition detected at TC = 310 K, with magnetic moments aligned parallel to the basal plane.
• DFT calculations confirmed ferromagnetic solutions.

Conclusions:

• The synthesized 1T-CrTe2 exhibits unique structural and electronic properties.
• The compound displays ferromagnetism with a transition temperature of 310 K.
• Both experimental data and theoretical calculations indicate that the ferromagnetism in 1T-CrTe2 is of an itinerant nature.