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The sensitivity of the method of neutron scattering to novel neutron–nucleon interactions is analyzed. Upper limits on the coupling constant of such interactions are imposed using the available data on neutron powder diffraction on polycrystalline silicon. [...]

We report high-precision small-angle neutron scattering of the orientation of the Skyrmion lattice in a spherical sample of MnSi under systematic changes of the magnetic field direction. For all field directions the Skyrmion lattice may be accurately described as a triple-Q→ state, where the modulus |Q→| is constant and the wave vectors enclose rigid angles of 120°. [...]

The antiferromagnetic (AF) order of electron-doped cuprates extends up to at least the superconducting (SC) region of the phase diagram. Whether the AF and SC states coexist is still a matter of controversy [...]