Abstract
Pyrochlore-type molybdates R 2 Mo 2O7 (R = rare earth elements and Y), showing a ferromagnetic metal (FM) to spin-glass insulator (SGI) transition as a function of R, have been studied by means of photoemission spectrosocpy (PES) and soft X-ray magnetic circular dichroism (XMCD) with focusing on the role of the strong correlation of the Mo 4d electrons. Bulk sensitive PES was performed by utilizing the high-resolution soft X-ray from SPring-8. The PES spectra are compared with the band structure calculation. The XMCD spectra are analyzed by means of the sum-rule (Mo 3 p → 3 d XMCD) and by comparison with atomic calculation (R 3 d → 4 f XMCD) in order to estimate separately the Mo and R magnetic moments.
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