Anomalous transverse response of 
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 and universality of the room-temperature 
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Xu, Liangcai; Li, Xiaokang; Ding, Linchao; Chen, Taishi; Sakai, Akito; Fauqué, Benoît; Nakatsuji, Satoru; Zhu, Zengwei; Behnia, Kamran

doi:10.1103/physrevb.101.180404

Cited by 71 publications

(56 citation statements)

References 31 publications

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“…As temperature is increased, the relationship between  ij and  ij is less straight forward. Behnia et al (28) have argued, however, that the ratio of  ij / ij is bounded by the ratio of natural units k B /e = 86 V/K, which reflects the fact that the Peltier coefficient represents the transport of entropy, while the Hall coefficient represents the transport of charge. For UCo 0.8 Ru 0.2 Al,  ij / ij reaches 170 V/K at T = 47 K, as shown in Fig.…”

Section: Discussionmentioning

confidence: 99%

Colossal anomalous Nernst effect in a correlated noncentrosymmetric kagome ferromagnet

et al. 2021

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The transverse voltage generated by a temperature gradient in a perpendicularly applied magnetic field, termed the Nernst effect, has promise for thermoelectric applications and for probing electronic structure. In magnetic materials, an anomalous Nernst effect (ANE) is possible in a zero magnetic field. We report a colossal ANE in the ferromagnetic metal UCo0.8Ru0.2Al, reaching 23 microvolts per kelvin. Uranium’s 5f electrons provide strong electronic correlations that lead to narrow bands, a known route to producing a large thermoelectric response. In addition, uranium’s strong spin-orbit coupling produces an intrinsic transverse response in this material due to the Berry curvature associated with the relativistic electronic structure. Theoretical calculations show that in UCo0.8Ru0.2Al at least 148 Weyl nodes, and two nodal lines, exist within 60 millielectron volt of the Fermi level. This work demonstrates that magnetic actinide materials can host strong Nernst and Hall responses due to their combined correlated and topological nature.

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Section: Discussionmentioning

confidence: 99%

Colossal anomalous Nernst effect in a correlated noncentrosymmetric kagome ferromagnet

et al. 2021

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“…xy and σ A xy are enhanced more than one order of magnitude by increasing N v from 25.6 to 28.5, we confirmed that the α A xy =σ A xy ratios of our Co 2 MnGa films also follow this universal behavior. It signifies that the main origin of AHE and ANE in all Co 2 MnGa films comes from the intrinsic topological nature 34 .…”

Section: While Both α Amentioning

confidence: 91%

“…xy vs. σ A xy in our Co 2 MnGa films (red circles) and different magnets (gray squares: taken from ref. 34 ). the k i = 0 planes (i = x, y, z) 9,15,28,38,39 .…”

Section: While Both α Amentioning

confidence: 99%

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Spin-polarized Weyl cones and giant anomalous Nernst effect in ferromagnetic Heusler films

et al. 2020

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Weyl semimetals are characterized by the presence of massless band dispersion in momentum space. When a Weyl semimetal meets magnetism, large anomalous transport properties emerge as a consequence of its topological nature. Here, using in−situ spin- and angle-resolved photoelectron spectroscopy combined with ab initio calculations, we visualize the spin-polarized Weyl cone and flat-band surface states of ferromagnetic Co2MnGa films with full remanent magnetization. We demonstrate that the anomalous Hall and Nernst conductivities systematically grow when the magnetization-induced massive Weyl cone at a Lifshitz quantum critical point approaches the Fermi energy, until a high anomalous Nernst thermopower of ~6.2 μVK−1 is realized at room temperature. Given this topological quantum state and full remanent magnetization, Co2MnGa films are promising for realizing high efficiency heat flux and magnetic field sensing devices operable at room temperature and zero-field.

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“…Co 2 MnGa crystallizes in the Cu 2 MnAl-type structure ( L 2 1 , space group

, #225) with a Curie temperature of T C = 694 K and saturation moment of M s = 4.05 µ B per formula unit [ 33 ]. Single crystals and thin films exhibit Berry curvature-driven large anomalous Hall and Nernst effects [ 16 , 34 , 35 , 36 , 37 , 38 , 39 ]. Further, Co 2 MnGa films show negative magnetoresistances [ 40 ] and high spin polarization [ 41 , 42 ], which in turn results in low magnetic damping [ 42 , 43 ].…”

Section: Introductionmentioning

confidence: 99%

Magnetic and Electronic Properties of Weyl Semimetal Co2MnGa Thin Films

et al. 2021

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Magnetic Weyl semimetals are newly discovered quantum materials with the potential for use in spintronic applications. Of particular interest is the cubic Heusler compound Co2MnGa due to its inherent magnetic and topological properties. This work presents the structural, magnetic and electronic properties of magnetron co-sputtered Co2MnGa thin films, with thicknesses ranging from 10 to 80 nm. Polarized neutron reflectometry confirmed a uniform magnetization through the films. Hard x-ray photoelectron spectroscopy revealed a high degree of spin polarization and localized (itinerant) character of the Mn d (Co d) valence electrons and accompanying magnetic moments. Further, broadband and field orientation-dependent ferromagnetic resonance measurements indicated a relation between the thickness-dependent structural and magnetic properties. The increase of the tensile strain-induced tetragonal distortion in the thinner films was reflected in an increase of the cubic anisotropy term and a decrease of the perpendicular uniaxial term. The lattice distortion led to a reduction of the Gilbert damping parameter and the thickness-dependent film quality affected the inhomogeneous linewidth broadening. These experimental findings will enrich the understanding of the electronic and magnetic properties of magnetic Weyl semimetal thin films.

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Anomalous transverse response of Co2MnGa and universality of the room-temperature αijA/σij

Cited by 71 publications

References 31 publications

Colossal anomalous Nernst effect in a correlated noncentrosymmetric kagome ferromagnet

Colossal anomalous Nernst effect in a correlated noncentrosymmetric kagome ferromagnet

Spin-polarized Weyl cones and giant anomalous Nernst effect in ferromagnetic Heusler films

Magnetic and Electronic Properties of Weyl Semimetal Co2MnGa Thin Films

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