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High-field depinned phase and planar Hall effect in the skyrmion host Gd$$_2$$PdSi$$_3$$

磁気スキルミオン物質Gd$$_2$$PdSi$$_3$$における高磁場磁気相とプラナー・ホール効果

Hirschberger, M.*; 中島 多朗*; Kriener, M.*; 車地 崇*; Spitz, L.*; Gao, S.*; 吉川 明子*; 山崎 裕一*; 佐賀山 基*; 中尾 裕則*; 河村 聖子  ; 田口 康二郎*; 有馬 孝尚*; 十倉 好紀*

Hirschberger, M.*; Nakajima, Taro*; Kriener, M.*; Kurumaji, Takashi*; Spitz, L.*; Gao, S.*; Kikkawa, Akiko*; Yamasaki, Yuichi*; Sagayama, Hajime*; Nakao, Hironori*; Kawamura, Seiko; Taguchi, Yasujiro*; Arima, Takahisa*; Tokura, Yoshinori*

For the skyrmion-hosting intermetallic Gd$$_2$$PdSi$$_3$$ with centrosymmetric hexagonal lattice and triangular net of rare earth sites, we report a thorough investigation of the magnetic phase diagram. Our work reveals a magnetic phase with an isotropic value of the critical field for all orientations, where the magnetic ordering vector ${bf q}$ is depinned from its preferred directions in the basal plane. The bulk nature of the skyrmion lattice and of other magnetic phases was evidenced by specific-heat measurements. Resistivity anisotropy, likely originating from partial gapping of the density of states along ${bf q}$ in this Ruderman-Kittel-Kasuya-Yoshida magnet, is picked up via the planar Hall effect (PHE). The PHE confirms the single-${bf q}$ nature of the magnetic order when the field is in the hexagonal plane, and allows one to detect the preferred directions of ${bf q}$. Several scenarios for the depinned phase are discussed on the basis of the data.

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パーセンタイル:93.01

分野:Materials Science, Multidisciplinary

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