Journal
NANO LETTERS
Volume 20, Issue 1, Pages 300-305Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.9b03822
Keywords
magnetic Weyl semimet; anomalous Hall effect; anomalous Nernst effect; Mott relation; phase transition; thermomagnetic transport
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Funding
- DFG through Wurzburg-Dresden Cluster of Excellence on Complexity and Topology in Quantum Matter -ct.qmat [EXC 2147, 39085490, SFB 1143/C08]
- Alexander von Humboldt Foundation through the Georg Forster Research Fellowship Program
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Weyl semimetals exhibit interesting electronic properties due to their topological band structure. In particular, large anomalous Hall and anomalous Nernst signals are often reported, which allow for a detailed and quantitative study of subtle features. We pattern single crystals of the magnetic Weyl semimetal Co3Sn2S2 into nanoribbon devices using focused ion beam cutting and optical lithography. This approach enables a very precise study of the galvano- and thermomagnetic transport properties. Indeed, we found interesting features in the temperature dependency of the anomalous Hall and Nernst effects. We present an analysis of the data based on the Mott relation and identify in the Nernst response signatures of magnetic fluctuations enhancing the anomalous Nernst conductivity at the magnetic phase transition.
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