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The recent discovery of Spin-ice is a spectacular example of non-coplanarspin arrangements that can arise in the pyrochlore A2B2O7 structure. We presentmagnetic and thermodynamic studies on the metallic-ferromagnet pyrochloreSm2Mo2O7. Our studies, carried out on oriented crystals, suggest that the Smspins have an ordered spin-ice ground state below about T* = 15 K. Thetemperature- and field-evolution of the ordered spin-ice state are governed byan antiferromagnetic coupling between the Sm and Mo spins. We propose that as aconsequence of a robust feature of this coupling, the tetrahedra aligned withthe external field adopt a "1-in, 3-out" spin structure as opposed to "3-in,1-out" in dipolar spin ices, as the field exceeds a critical value.

Ordered spin-ice state in the geometrically frustrated metallic-ferromagnet Sm2Mo2O7