Charge Transfer Effect under Odd-Parity Crystalline Electric Field: Divergence of Magnetic Toroidal Fluctuation in $\beta$-YbAlB${}_4$

Abstract

A novel property of the quantum critical heavy fermion superconductor $\beta$-YbAlB${}_4$ is revealed theoretically. By analyzing the crystalline electronic field (CEF) on the basis of the hybridization picture, odd parity CEF is shown to exist because of sevenfold configuration of B atoms around Yb, which breaks the local inversion symmetry. This allows onsite admixture of 4f and 5d wavefunctions with a pure imaginary coefficient, giving rise to the magnetic toroidal (MT) degree of freedom. By constructing a realistic minimal model for $\beta$-YbAlB${}_4$, we show that onsite 4f-5d Coulomb repulsion drives charge transfer between the 4f and 5d states at Yb, which makes the MT fluctuation as well as the electric dipole fluctuation diverge simultaneously with the critical Yb-valence fluctuation at the quantum critical point of the valence transition.

5 pages, 3 figures

References in corpus (5)

• Quantum Valence Criticality as Origin of Unconventional Critical Phenomena
• Roles of Critical Valence Fluctuations in Ce- and Yb-Based Heavy Fermion Metals
• Layered Kondo lattice model for quantum critical beta-YbAlB4
• T/B Scaling in beta-YbAlB4
• Kondo hybridization and quantum criticality in $\beta$-YbAlB${}_4$ by laser-ARPES

Cited by in corpus (2)

• Spin Conductivity Based on Magnetic Toroidal Quadrupole Hidden in Antiferromagnets
• Ultrasound Response in Quantum Critical $\beta$-YbAlB${}_4$ and $\alpha$-YbAl${}_{0.986}$Fe${}_{0.014}$B${}_4$