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Abstract:
We study the effects of adding electrons to the conduction bands of the
itinerant metamagnet Sr(3)Ru(2)O(7) using substitution of La(3+) onto
the Sr(2+) site. Small changes to the chemical potential have a large
effect: adding only 0.03 electrons per Ru reduces the electronic
specific-heat coefficient by 30%, but makes no corresponding change to
the temperature (similar to 8 K) at which the electronic specific-heat
coefficient shows its maximum. The observations are incompatible with a
simple rigid-band shift, raising the possibility that a many-body
resonance plays a key role in the physics of Sr(3)Ru(2)O(7).
