Anomalous Nernst Effects in Pyrochlore Molybdates with Spin Chirality

Hanasaki, N.; Sano, Koki; Onose, Y.; Ohtsuka, Toshiya; Iguchi, Satoshi; Kézsmárki, I.; Miyasaka, S.; Onoda, Shigeki; Nagaosa, Naoto; Tokura, Y.

doi:10.1103/physrevlett.100.106601

Cited by 55 publications

(28 citation statements)

References 28 publications

(30 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Fe 3 O 4 (300K) [10]; MnGe(140K) [45], MnGe(100K) [45] and MnGe(20K) [45]; Nd 2 Mo 2 O 7 [46]; Co/Ni film(300K) [47]; Pt/Fe multilayer(300K) [48]; MnGa(300K) [47]; Mn 2 Ga(300K) [47]; FePt(300K) [47]; and FePd(300K) [47]; Mn 3 Sn [42] In figure 4b,…”

Section: Methodsmentioning

confidence: 99%

Giant anomalous Nernst effect in the magnetic Weyl semimetal Co3Sn2S2

Yang

You

Wang

et al. 2020

Phys. Rev. Materials

View full text Add to dashboard Cite

In ferromagnetic solids, even in absence of magnetic field, a transverse voltage can be generated by a longitudinal temperature gradient. This thermoelectric counterpart of the Anomalous Hall effect (AHE) is dubbed the Anomalous Nernst effect (ANE). Expected to scale with spontaneous magnetization, both these effects arise because of the Berry curvature at the Fermi energy. Here, we report the observation of a giant ANE in a newly-discovered magnetic Weyl semimetal Co3Sn2S2 crystal. Hall resistivity and Nernst signal both show sharp jumps at a threshold field and exhibit a clear hysteresis loop below the ferromagnetic transition temperature. The ANE signal peaks a maximum value of ∼ 5 µV/K which is comparable to the largest seen in any magnetic material. Moreover, the anomalous transverse thermoelectric conductivity αyx becomes as large as ∼ 10 A/K.m at 70 K, the largest in known semimetals. The observed ANE signal is much larger than what is expected according to the magnetization.

show abstract

Section: Methodsmentioning

confidence: 99%

Giant anomalous Nernst effect in the magnetic Weyl semimetal Co3Sn2S2

Yang

You

Wang

et al. 2020

Phys. Rev. Materials

View full text Add to dashboard Cite

show abstract

“…DOI Spin caloritronic effects have been extensively studied using integral (homogeneous) thermal gradients [1,2]. In ferromagnetic conductors exposed to a thermal gradient in the Nernst geometry, one observes the anomalous Nernst effect (ANE), which describes the occurrence of an electric field E ANE / ÀM Â rT, perpendicular to both the temperature gradient rT and the magnetization M. The anomalous Nernst effect has been studied in a variety of ferromagnetic thin film metals [3,4], oxides [4,5], spinels [4,6,7], and diluted magnetic semiconductors [8]. In analogy to charge-based caloritronic effects, the recently discovered spin Seebeck effect (SSE) [9] describes the generation of a spin current J s parallel to an applied temperature gradient rT in ferromagnetic materials.…”

mentioning

confidence: 99%

Local Charge and Spin Currents in Magnetothermal Landscapes

et al. 2012

View full text Add to dashboard Cite

A scannable laser beam is used to generate local thermal gradients in metallic (Co2FeAl) or insulating (Y3Fe5O12) ferromagnetic thin films. We study the resulting local charge and spin currents that arise due to the anomalous Nernst effect (ANE) and the spin Seebeck effect (SSE), respectively. In the local ANE experiments, we detect the voltage in the Co2FeAl thin film plane as a function of the laser-spot position and external magnetic field magnitude and orientation. The local SSE effect is detected in a similar fashion by exploiting the inverse spin Hall effect in a Pt layer deposited on top of the Y3Fe5O12. Our findings establish local thermal spin and charge current generation as well as spin caloritronic domain imaging.

show abstract

“…8,9 The ferromagnetic metals ͑such as Nd 2 Mo 2 O 7 and Sm 2 Mo 2 O 7 ͒ show an interesting interplay between the spin configuration and the transport properties, which can give rise to anomalous Hall and Nernst signals. 10,11 The spin-glass insulators ͑such as Y 2 Mo 2 O 7 and Tb 2 Mo 2 O 7 ͒ have generated much interest due to the apparent lack of chemical disorder and the relation to geometrical frustration. 1,2 Outside of the Mo family, pyrochlore compounds with Tb as the rare earth have been extensively studied because the combination of exchange and dipolar interactions coupled with moderate spin anisotropy can lead to various ground states depending on the metal ion.…”

mentioning

confidence: 99%

Spin correlations in the geometrically frustrated pyrochloreTb2Mo2O7

et al. 2008

View full text Add to dashboard Cite

We report neutron-scattering studies of the spin correlations of the geometrically frustrated pyrochlore Tb 2 Mo 2 O 7 using single-crystal samples. This material undergoes a spin-freezing transition below T g Ӎ 24 K, similar to Y 2 Mo 2 O 7 , and has little apparent chemical disorder. Diffuse elastic peaks are observed at low temperatures, indicating short-range ordering of the Tb moments in an arrangement where the Tb moments are slightly rotated from the preferred directions of the spin-ice structure. In addition, a Q ជ -independent signal is observed which likely originates from frozen but completely uncorrelated Tb moments. Inelastic measurements show the absence of sharp peaks due to crystal-field excitations. These data show how the physics of the Tb sublattice responds to the glassy behavior of the Mo sublattice with the associated effects of lattice disorder.

show abstract

Anomalous Nernst Effects in Pyrochlore Molybdates with Spin Chirality

Cited by 55 publications

References 28 publications

Giant anomalous Nernst effect in the magnetic Weyl semimetal Co3Sn2S2

Giant anomalous Nernst effect in the magnetic Weyl semimetal Co3Sn2S2

Local Charge and Spin Currents in Magnetothermal Landscapes

Spin correlations in the geometrically frustrated pyrochloreTb2Mo2O7

Contact Info

Product

Resources

About