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Electrical resistivity ($\rho$), magnetoresistance (MR), magnetization,thermopower and Hall effect measurements on the single crystalGd$_{2}$PdSi$_3$, crystallizing in an AlB$_2$-derived hexagonal structure arereported. The well-defined minimum in $\rho$ at a temperature above N\'eeltemperature (T$_N$= 21 K) and large negative MR below $\sim$ 3T$_N$, reportedearlier for the polycrystals, are reproducible even in single crystals. Suchfeatures are generally uncharacteristic of Gd alloys. In addition, we alsofound interesting features in other data, e.g., two-step first-order-likemetamagnetic transitions for the magnetic field along [0001] direction. Thealloy exhibits anisotropy in all these properties, though Gd is a S-state ion.Comment: RevTeX, 5 pages, 6 encapsulated postscript figures; scheduled to be  published in Phy. Rev. B (01 November 1999, B1

physical review. b, condensed matter

Magnetic anisotropy, first-order-like metamagnetic transitions, and large negative magnetoresistance in single-crystal<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Gd</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">PdSi</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>

Magnetic anisotropy, first-order-like metamagnetic transitions, and large negative magnetoresistance in single-crystalGd2PdSi3