1984 Volume 53 Issue 8 Pages 2726-2733
The magnetic phase diagram of MnSi near the critical temperature TN=29.5 K has been studied by neutron small angle scattering at KENS. It has been found that the anomalous new phase predicted by various methods to exist around at 28 K and 2 kOe is the paramagnetic phase where the magnetic correlations exhibit the same characteristics as those found at 29.5 K and zero magnetic field. This phenomenon, together with the sharp decrease of the magnetic phase boundary at TN and the substantial increase of the satellite Q vector at this temperature, has been found not to be interpreted by the current theories.
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