Orbital magnetization in the Nb-substituted Kagome metal CsV₃Sb₅

2025/11/03 by Elmers, H. J., Tkach, O., Lytvynenko, Y. +12
#FOS: Physical sciences #Materials Science (cond-mat.mtrl-sci)

paper · doi:10.48550/arxiv.2511.01238

Abstract

This study uses angle-resolved photoemission spectroscopy to examine the low-temperature electronic structure of Cs(V_0.95Nb_0.05)₃Sb₅, demonstrating that partially substituting V atoms with isoelectronic Nb atoms results in \bluean increase of the band width and enhanced gap opening at the Dirac-like crossings due to the resulting chemical pressure. This increases the magnetic circular dichroism signal in the angular distribution (MCDAD) compared to CsV₃Sb₅, enabling detailed analysis of magnetic circular dichroism in several bands near the Fermi level. These results \bluesubstantiate the predicted coupling of orbital magnetic moments to three van Hove singularities near the Fermi level at M points. Previous studies have observed that Nb doping \bluelowers the charge density transition temperature and increases the critical temperature for superconductivity. This article demonstrates that Nb doping concomitantly increases the magnetic circular dichroism signal attributed to orbital moments.

Citations

• Superconductivity in kagome metals due to soft loop-current fluctuations
• Chirality in the Kagome Metal CsV₃Sb₅
• Hybrid Photoelectron Momentum Microscope at the Soft X-ray Beamline I09 of the Diamond Light Source
• Three-dimensional hidden phase probed by in-plane magnetotransport in kagome metal CsV₃Sb₅ thin flakes
• Observation of time-reversal symmetry breaking in the band structure of altermagnetic RuO₂
• Twofold van Hove singularity and origin of charge order in topological kagome superconductor CsV3Sb5

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• Magnetic field-induced momentum-dependent symmetry breaking in a kagome superconductor
• The Ground State Lattice Distortion of CsV₃Sb₅ Revealed by de Haas-van Alphen Oscillations