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Partially disordered antiferro (PDA) magnetism (in which one of the threemagnetic ions in a triangular network remains magnetically disordered), hasbeen known commonly among geometrically frustrated insulating materials. Theone-third plateau in isothermal magnetization (M) of such materials has been ofgreat theoretical interest. Here, we report these properties in aAlB2-structure derived metallic material, Er2RhSi3 in which Er sublattice hastriangular networks. The presence of a well-defined lamda anomaly in thetemperature (T) dependence of heat capacity and its magnetic-field (H)dependence, and the loss of spin-disorder contribution in electricalresistivity (rho) confirm antiferromagnetic order below (TN=) 5 K. On the otherhand, the separation of zero-field-cooled and field-cooled dc magneticsusceptibility (chi) curves, decay of isothermal remnant magnetization and thefrequency dependence of real and imaginary components of ac chi suggest theonset of spin-glass freezing concomitant with the antiferromagnetic order. Inaddition, interestingly, we observe one-third plateau in M(H) below 20 kOe forT less than TN. The change in rho as a function of H at a given temperaturewell below TN is also revealing, with this compound exhibiting a plateau below20 kOe, with complexities at higher fields. Therefore, this compound serves asa prototype for theoretical understanding of transport behavior acrossone-third plateau due to PDA magnetism in a metal without any interference fromthe 4f delocalization phenomena.

Emergence of partially disordered antiferromagnetism and isothermal  magnetization plateau due to geometrical frustration in a metallic compound,  Er2RhSi3