Giant anomalous Nernst signal in the antiferromagnet YbMnBi2

Abstract

Searching for a high anomalous Nernst effect (ANE) is crucial for thermoelectric energy conversion applications because the associated unique transverse geometry facilitates module fabrication. Topological ferromagnets with large Berry curvatures show high ANEs; however, they face drawbacks such as strong magnetic disturbances and low mobility due to high magnetization. Herein, we demonstrate that YbMnBi2, a canted antiferromagnet, has a large ANE conductivity of ~10 Am-1K-1 that surpasses the common high values (i.e. 3-5 Am-1K-1) observed so far in ferromagnets. The canted spin structure of Mn guarantees a nonzero Berry curvature but generates only a weak magnetization three orders of magnitude lower than that of general ferromagnets. The heavy Bi with a large spin-orbit coupling enables a high ANE and low thermal conductivity, whereas its highly dispersive px/y orbitals ensure low resistivity. The high anomalous transverse thermoelectric performance and extremely small magnetization makes YbMnBi2 an excellent candidate for transverse thermoelectrics.

References in corpus (24)

• Berry Phase Effects on Electronic Properties
• Anomalous Hall effect
• Topological Materials: Weyl Semimetals
• Large anomalous Nernst effect at room temperature in a chiral antiferromagnet
• Berry phase effect in anomalous thermoelectric transport
• Giant anomalous Nernst effect and quantum-critical scaling in a ferromagnetic semimetal
• High-throughput calculations of magnetic topological materials
• Spectral and Fermi surface properties from Wannier interpolation
• Zero-field Nernst effect in a ferromagnetic kagome-lattice Weyl-semimetal Co3Sn2S2
• Anomalous Nernst effect beyond the magnetization scaling relation in the ferromagnetic Heusler compound Co${}_2$MnGa
• Anomalous Nernst and Righi-Leduc effects in Mn${}_3$Sn: Berry curvature and entropy flow
• Mott Relation for Anomalous Hall and Nernst effects in Ga1-xMnxAs Ferromagnetic Semiconductors
• Anomalous Nernst Effect in Dirac Semimetal Cd3As2
• A magnetic topological semimetal Sr1-yMn1-zSb2 (y, z< 0.1)
• Magnon-drag thermopower and Nernst coefficient in Fe, Co, and Ni
• Berry curvature unravelled by the Nernst effect in Mn${}_3$Ge
• Transverse thermoelectric generation using magnetic materials
• Anomalous transverse response of Co${}_2$MnGa and universality of the room-temperature ${\alpha }_{ij}^A/{\sigma }_{ij}^A$ ratio across topological magnets
• Finite-temperature violation of the anomalous transverse Wiedemann-Franz law
• Observation of anomalous Ettingshausen effect and large transverse thermoelectric conductivity in permanent magnets
• Magnon-induced Giant Anomalous Nernst Effect in Single Crystal MnBi
• Enhanced anomalous Nernst effect in disordered Dirac and Weyl materials
• Magnetic structure and excitations of the topological semimetal YbMnBi${}_2$
• Design strong anomalous Hall effect via spin canting in antiferromagnetic nodal line materials

Cited by in corpus (2)

• Observation of the anomalous Nernst effect in altermagnetic candidate Mn5Si3
• The discovery of three-dimensional Van Hove singularity