Magnetic field-controlled lattice thermal conductivity in MnBi2Te4

Abstract

Phonon properties and the lattice thermal conductivity are not generally understood to be sensitive to magnetic fields. Using an applied field to change MnBi2Te4 between antiferromagnetic (AFM), canted (CAFM) and ferromagnetic (FM) phases we discovered a new way to control the lattice thermal conductivity, generating both a positive and a negative magnetic field dependence. We report the field dependence of the thermal conductivity, k, in the in-plane direction under an applied magnetic field along the cross-plane direction in MnBi2Te4 from 2K to 30K. k decreases with field in the AFM phase, saturates in the CAFM phase, and increases with field in the FM phase. We explain this in terms of the field-induced changes of the magnon gap which modifies which magnon-phonon scattering processes are allowed by energy conservation. We also report magneto-Seebeck coefficient, Nernst coefficient and thermal Hall data measured in the same configuration. This finding may open a way to design magnetically controlled heat switches.

References in corpus (14)

• Crystal growth and magnetic structure of MnBi2Te4
• Magnon Polarons in the Spin Seebeck Effect
• Robust A-type order and spin-flop transition on the surface of the antiferromagnetic topological insulator MnBi${}_2$Te${}_4$
• Magnetized Topological Insulator Multilayers
• Topological Magnetoelastic Excitations in Non-Collinear Antiferromagnets
• Unusual heat transport of the Kitaev material Na${}_2$Co${}_2$TeO${}_6$: putative quantum spin liquid and low-energy spin excitations
• Interlayer magnetophononic coupling in MnBi2Te4
• Angular Momentum Conservation and Phonon Spin in Magnetic Insulators
• Topological response of the anomalous Hall effect in MnBi2Te4 due to magnetic canting
• Charged Defects and Phonon Hall Effects in Ionic Crystals
• Two-dimensional ferromagnetism with long-range interactions in the layered magnetic topological insulator MnBi2Te4
• Thermal and thermoelectric properties of an antiferromagnetic topological insulator MnBi${}_2$Te${}_4$
• Diagonal and off-diagonal thermal conduction with resonant phonon scattering in $N{i}_{3}Te{O}_6$
• Evidence of Weyl Fermion Enhanced Thermal Conductivity Under Magnetic Fields in Antiferromagnetic Topological Insulator Mn(Bi(1-x)Sb(x))2Te4

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• Large Thermal Hall Effect in MnPS${}_3$
• Using magnetic dynamics to measure the spin gap in a candidate Kitaev material