We show that the magnetic properties of frustrated itinerant systems can be described by a peculiar shape of the q-dependent susceptibility. We justify the fact that the spin fluctuation spectrum is especially broad in this case. This spectrum is used to calculate the spin fluctuation contribution to the specific heat; we show that this contribution can be very large close to a magnetic-non-magnetic instability. Comparison with recent experimental results on YMn 2 is made and the similarities of this compound with the 4f heavy-fermion compounds are emphasized.
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Pinettes et al. (1994) studied this question.
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