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The crossover from a spin-polarized to nonpolarized state as a function of pressure (p) at low temperature (T) has been investigated in MnSi via high-precision measurements of the electrical resistivity and magnetic susceptibility. In the magnetic phase (pp₂14. 6 kbar), T^2 at low T as expected for a Fermi liquid in a weakly polarized state. In the nonmagnetic phase (p>p₂), vs T is consistent with the predictions for a marginal Fermi liquid model in which nearly critical spin fluctuations of long wavelength lead to a singular quasiparticle interaction. The transition is second order for pp^*12 kbar and weakly first order in the range p^*p₂, where the transition temperature T₂ lies below a peak of vs T. The variation of T₂ with p and of both and with T and p may be understood in terms of a model of quantum critical phenomena.
Pfleiderer et al. (Tue,) studied this question.