期刊
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
卷 88, 期 9, 页码 -出版社
PHYSICAL SOC JAPAN
DOI: 10.7566/JPSJ.88.094705
关键词
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资金
- JSPS KAKENHI [JP18H04329, JP17K05547, JP16K05453, JP15H05884, JP15H05882, JP15H05886]
- [JP18J15180]
We measured the magnetization, ac susceptibility, Hall resistivity, and magnetoresistance for a cubic chiral anti-ferromagnet EuPtSi, and found the skyrmion lattice of the so-called A-phase in a wide field direction, except around H parallel to [110], together with a new skyrmion-related phase named the B-phase for H parallel to [001]. A large magnitude of a skyrmion-derived additional Hall resistivity is discussed on the basis of a small size of the skyrmion, 18 angstrom for H parallel to [111]. We also observed the de Haas-van Alphen oscillations and clarified the Fermi surface properties. Many nearly spherical Fermi surfaces are observed in EuPtSi, which are well explained by the results of full-potential linearized augmented plane wave band calculations for a non-4f reference compound SrPtSi. The splitting energy of main two split Fermi surfaces named alpha and alpha' is determined as a large value of 1200 K, mainly reflecting the chiral (noncentrosymmetric) crystal structure and a large spin-orbit coupling of Pt-5d electrons.
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