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We report the existence of a field-induced ferromagnetic transition in themagnetically ordered state (<69 K) of an intermetallic compound, Tb5Si3, andthis transition is distinctly first-order at 1.8 K (near 60 kOe), whereas itappears to become second order near 20 K. The finding we stress is that theelectrical resistivity becomes suddenly large in the high-field state afterthis transition and this is observed in the entire temperature range in themagnetically ordered state. Such an enhancement of 'positive' magnetoresistance(below 100 kOe) at the metamagnetic transition field is unexpected on the basisthat the application of magnetic field should favor a low-resistive state dueto alignment of spins.

Enhancement of positive magnetoresistance following a magnetic-field-induced ferromagnetic transition in an intermetallic compound, Tb5Si3