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We report an unusual sensitivity of electrical resistivity (rho) to anapplication of a small magnetic field in an intermetallic compound, Tb5Si3,under pressure. In this compound, there is a magnetic field-induced first-ordermagnetic transition at 1.8 K. Under pressure, there is a metastable magneticphase after reducing the field to zero. This metastable phase is relatively ofhigher rho and interestingly a small magnetic field (less than 2 kOe) in thereverse direction results in a sharp fall of rho to restore virgin state rho.The present finding could be relevant to spintronic applications.

Sharp fall of electrical resistance for a small application of magnetic field on a metastable form of a compound, Tb5Si3, under pressure