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Phys Rev Lett. 2007 Oct 12;99(15):156406. Epub 2007 Oct 11.

Magnetic field and pressure dependence of small angle neutron scattering in MnSi.

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Physikalisches Institut, Universit├Ąt Karlsruhe, Wolfgang-Gaede-Str. 1, D-76128 Karlsruhe, Germany.


We report small angle neutron scattering of spontaneous and magnetic field aligned components of the helical spin polarization in MnSi for temperatures T down to 0.35 K, at pressures p up to 21 kbar, and magnetic field B up to 0.7 T. The parameter range of our study spans the first order transition between helical order and partial magnetic order at p{c}=14.6 kbar, which coincides with the onset of an extended regime of non-Fermi liquid resistivity. Our study suggests that MnSi above p{c} is not dominated by the remnants of the first order transition at p{c}, but that an unidentified mechanism favors stabilization of a new ground state other than helical order.

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