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High field X-ray diffraction study on a magnetic-field-induced valence transition in YbInCu$$_4$$

強磁場中X線回折によるYbInCu$$_4$$の磁場誘起価数転移の研究

松田 康弘*; 稲見 俊哉; 大和田 謙二; 村田 悠人*; 野尻 浩之*; 村上 洋一*; 太田 寛人*; Zhang, W.*; 吉村 一良*

Matsuda, Yasuhiro*; Inami, Toshiya; Owada, Kenji; Murata, Yuto*; Nojiri, Hiroyuki*; Murakami, Yoichi*; Ota, Hiroto*; Zhang, W.*; Yoshimura, Kazuyoshi*

放射光X線とパルスマグネットを用いた30Tを超える高磁場下X線回折について報告する。YbInCu$$_4$$の磁場誘起価数転移に伴う格子変形について研究した。32KでのBragg反射の形は27T以上で構造変化のため大きく変わる。転移磁場近傍では、低磁場相と高磁場相が格子定数の不連続を伴って入れ替わる。これはこの磁場誘起相転移が一次相転移の証拠である。低磁場相のBragg反射の強度の磁場依存性はおおよそ磁化に比例する。

We report the first high-field X-ray diffraction experiment using synchrotron X-rays and pulsedmagnetic fields exceeding 30 T. The lattice deformation due to a magnetic-field-induced valencetransition in YbInCu$$_4$$ is studied. It has been found that the Bragg reflection profile at 32K changessignificantly at around 27 T due to the structural transition. In the vicinity of the transition field, the lowfield and high field phases alternate with the discontinuous change in the lattice constant. Thus, it isevident that the field-induced valence state transition is a first-order phase transition. The fielddependence of the low-field-phase Bragg peak intensity is found to be roughly scaled with themagnetization.

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パーセンタイル:82.55

分野:Physics, Multidisciplinary

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