Predicting Quantum Criticality in Single-Crystalline Ce₂Ru₃Ge₅

Area of Science:

• Condensed Matter Physics
• Materials Science
• Quantum Materials

Background:

• Strongly correlated f-electron systems exhibit exotic quantum states like quantum criticality.
• Predicting and studying quantum critical behavior, particularly in ferromagnetic materials, remains challenging.

Purpose of the Study:

• To develop a structure-property map for Ce2M3X5 materials to guide the design of systems exhibiting quantum criticality.
• To synthesize and characterize single-crystalline Ce2Ru3Ge5 to investigate its proximity to a ferromagnetic quantum critical point.

Main Methods:

• Development of a structure-property map for the Ce2M3X5 family.
• Synthesis of single-crystalline Ce2Ru3Ge5.
• Comprehensive physical property measurements: magnetic susceptibility, heat capacity, electrical resistivity, and magnetoresistance.

Main Results:

• A weak ferromagnetic-like response was observed in single-crystalline Ce2Ru3Ge5 at 7.5 K, contrasting with bulk ordering in polycrystals.
• Non-Fermi liquid behavior was identified in the temperature-dependent electrical resistivity and heat capacity of single crystals.
• These findings suggest intrinsic tuning near a ferromagnetic quantum critical point without external pressure.

Conclusions:

• Single-crystalline Ce2Ru3Ge5 is intrinsically positioned near a ferromagnetic quantum critical point.
• The developed structure-property map is a valuable tool for designing novel quantum critical materials.
• Discrepancies between single-crystal and polycrystalline results highlight the importance of sample quality in studying quantum phenomena.