New high temperature modification of CeTiGe: structural characterization and physical properties

Area of Science:

• Materials Science
• Condensed Matter Physics
• Solid State Chemistry

Background:

• Ternary germanides like CeTiGe are of interest due to their complex electronic and magnetic properties.
• Understanding structure-property relationships in these materials is crucial for developing new functional materials.

Purpose of the Study:

• To synthesize and characterize the high-temperature (HT) form of the ternary germanide CeTiGe.
• To investigate the structural, electrical, magnetic, and thermal properties of HT-CeTiGe.
• To compare the properties of HT-CeTiGe with its low-temperature (LT) form.

Main Methods:

• High-temperature synthesis via annealing at 1373 K.
• X-ray powder diffraction for structural analysis.
• Measurements of electrical resistivity, thermoelectric power, magnetization, and specific heat down to 2 K.

Main Results:

• HT-CeTiGe crystallizes in the tetragonal CeScSi type structure (space group I4/mmm).
• The compound exhibits non-magnetic, strongly correlated electron behavior.
• Specific heat measurements show a value of 0.635 J mol(-1) K(-2) for C/T at 2 K.
• A decrease in 4f(Ce)-conduction electron hybridization is observed from LT-CeTiGe to HT-CeTiGe.

Conclusions:

• The high-temperature form of CeTiGe presents a distinct crystallographic structure and electronic properties.
• The observed properties suggest a modification of the Ce 4f electron hybridization with temperature.
• Further studies are warranted to fully elucidate the behavior of CeTiGe under varying conditions.