Kagome Lattice Promotes Chiral Spin Fluctuations

Area of Science:

• Condensed Matter Physics
• Materials Science
• Quantum Mechanics

Background:

• Dzyaloshinskii-Moriya interactions induce chirality in magnetic spin fluctuations.
• The impact of lattice geometry on chiral spin fluctuations and Berry phase phenomena remains underexplored.
• Understanding these phenomena is crucial for novel electronic properties and devices.

Purpose of the Study:

• To investigate the role of lattice geometry in chiral spin fluctuations.
• To explore the connection between chiral spin fluctuations and transport anomalies driven by the Berry phase.
• To identify promising lattice structures for observing Berry phase phenomena in paramagnets.

Main Methods:

• Experimental detection of chiral spin fluctuations using thermoelectric Nernst and electric Hall effects.
• Comparative study of kagome and triangular lattice magnets in the paramagnetic regime.
• Validation and exploration using Monte Carlo simulations.

Main Results:

• Chiral spin fluctuations were detected in paramagnetic kagome lattice magnets.
• These fluctuations were largely absent in comparable triangular lattice magnets.
• Lattices with multiple dissimilar plaquettes were identified as promising for Berry phase phenomena.

Conclusions:

• Lattice geometry plays a critical role in the emergence of chiral spin fluctuations.
• Kagome lattices are conducive to Berry phase phenomena driven by thermal fluctuations.
• The findings provide insights into designing materials for advanced electronic applications.