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We report the first high-field x-ray diffraction experiment using synchrotronx-rays and pulsed magnetic fields exceeding 30 T. Lattice deformation due to amagnetic-field-induced valence transition in YbInCu4 is studied. It has beenfound that the Bragg reflection profile at 32 K changes significantly at around27 T due to the structural transition. In the vicinity of the transition fieldthe low-field and the high-field phases are observed simultaneously as the twodistinct Bragg reflection peaks: This is a direct evidence of the fact that thefield-induced valence state transition is the first order phase transition. Thefield-dependence of the low-field-phase Bragg peak intensity is found to bescaled with the magnetization.Comment: 5 pages, 6 figures, submitted to J. Phys. Soc. Jp

High Field X-ray Diffraction Study on a Magnetic-Field-Induced Valence Transition in YbInCu4

High Field X-ray Diffraction Study on a Magnetic-Field-Induced Valence Transition in YbInCu₄