Origin of modulated phases and magnetic hysteresis in TmB_4
Keola Wierschem, Sai Swaroop Sunku, Tai Kong, Toshimitsu Ito, Paul C., Canfield, Christos Panagopoulos, and Pinaki Sengupta
TL;DR
This paper explores the magnetic phases of TmB_4, revealing how modulated phases influence fractional magnetization plateaus and hysteresis, supported by experimental data and theoretical modeling.
Contribution
It introduces a phenomenological model and a microscopic Hamiltonian to explain the origin of modulated phases and magnetic hysteresis in TmB_4.
Findings
Fractional magnetization plateau explained by modulated phases
Magnetic hysteresis linked to zero-field modulated states
Microscopic Hamiltonian captures full magnetic behavior
Abstract
We investigate the low temperature magnetic phases in TmB_4, a metallic quantum magnet on the geometrically frustrated Shastry-Sutherland lattice, using co-ordinated experimental and theoretical studies. Our results provide an explanation for the appearance of the intriguing fractional plateau in TmB_4 and accompanying magnetic hysteresis. Together with observation of the bump in the half-plateau, our results support the picture that the magnetization plateau structure in TmB_4 is strongly influenced by the zero-field modulated phases. We present a phenomenological model to explain the appearance of the modulated phases and a microscopic Hamiltonian that captures the complete magnetic behavior of TmB_4.
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