Abstract
We have studied the magnetic structure of the noncentrosymmetric heavy-fermion superconductor CePt3Si using elastic polarized neutron scattering with field-projected (longitudinal) XYZ polarization analysis. We find that the magnetic moment has components both in the tetragonal basal plane and along the tetragonal four-fold axis. Such a magnetic structure is not symmetry-allowed if the magnetic phase transition is second order, and may imply that CePt3Si has lower symmetry in the superconducting state than originally thought.
Highlights
The magnetic structure of CePt3Si is characterized by a propagation vector k = (0, 0, 1/2), but the moment direction is not known
It was assumed that the magnetic structure consisted of sheets of collinear moments aligned along an unknown axis in the a–b plane, with the sheets stacked antiferromagnetically along the c axis [9]
On the assumption of moments aligned in the basal plane, this suggested that the moment magnitude would double for a field of only 6.6 T along the c axis
Summary
The main exchange interactions have been determined from the dispersion of the somewhat damped spin-wave excitations in the magnetically ordered phase by unpolarized inelastic neutron scattering (INS) [6]. The magnetic structure of CePt3Si is characterized by a propagation vector k = (0, 0, 1/2), but the moment direction is not known.
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