TY - JOUR
T1 - Large magneto-Thermopower in MnGe with topological spin texture
AU - Fujishiro, Y.
AU - Kanazawa, N.
AU - Shimojima, T.
AU - Nakamura, A.
AU - Ishizaka, K.
AU - Koretsune, T.
AU - Arita, R.
AU - Miyake, A.
AU - Mitamura, H.
AU - Akiba, K.
AU - Tokunaga, M.
AU - Shiogai, J.
AU - Kimura, S.
AU - Awaji, S.
AU - Tsukazaki, A.
AU - Kikkawa, A.
AU - Taguchi, Y.
AU - Tokura, Y.
N1 - Funding Information:
We thank T. Yokouchi for fruitful discussions. We also thank Y. Yoshida and N. Mit-suishi for their cooperation on photoemission spectroscopy. This work was supported by JSPS KAKENHI (Grants Nos. 24224009 and 15H05456) and JST CREST (Grant No. JPMJCR16F1). A part of study was performed at International MegaGauss Science Laboratory of Institute for Solid State Physics, University of Tokyo, and at High Field Laboratory for Superconducting Materials, Institute for Materials Research, Tohoku University.
Publisher Copyright:
© The Author(s) 2018.
PY - 2018/12/1
Y1 - 2018/12/1
N2 - Quantum states characterized by nontrivial topology produce interesting electrodynamics and versatile electronic functionalities. One source for such remarkable phenomena is emergent electromagnetic field, which is the outcome of interplay between topological spin structures with scalar spin chirality and conduction electrons. However, it has scarcely been exploited for emergent function related to heat-electricity conversion. Here we report an unusually enhanced thermopower by application of magnetic field in MnGe hosting topological spin textures. By considering all conceivable origins through quantitative investigations of electronic structures and properties, a possible origin of large magneto-Thermopower is assigned to the strong energy dependence of charge-Transport lifetime caused by unconventional carrier scattering via the dynamics of emergent magnetic field. Furthermore, highmagnetic- field measurements corroborate the presence of residual magnetic fluctuations even in the nominally ferromagnetic region, leading to a subsisting behavior of field-enhanced thermopower. The present finding may pave a way for thermoelectric function of topological magnets.
AB - Quantum states characterized by nontrivial topology produce interesting electrodynamics and versatile electronic functionalities. One source for such remarkable phenomena is emergent electromagnetic field, which is the outcome of interplay between topological spin structures with scalar spin chirality and conduction electrons. However, it has scarcely been exploited for emergent function related to heat-electricity conversion. Here we report an unusually enhanced thermopower by application of magnetic field in MnGe hosting topological spin textures. By considering all conceivable origins through quantitative investigations of electronic structures and properties, a possible origin of large magneto-Thermopower is assigned to the strong energy dependence of charge-Transport lifetime caused by unconventional carrier scattering via the dynamics of emergent magnetic field. Furthermore, highmagnetic- field measurements corroborate the presence of residual magnetic fluctuations even in the nominally ferromagnetic region, leading to a subsisting behavior of field-enhanced thermopower. The present finding may pave a way for thermoelectric function of topological magnets.
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U2 - 10.1038/s41467-018-02857-1
DO - 10.1038/s41467-018-02857-1
M3 - Article
C2 - 29379016
AN - SCOPUS:85041337097
SN - 2041-1723
VL - 9
JO - Nature Communications
JF - Nature Communications
IS - 1
M1 - 408
ER -