Anomalous Spin Response in the Non-Centrosymmetric Metal CePt3Si
Abstract
Non-centrosymmetric metals with tetragonal structure are characterized by an antisymmetric Rashba-type spin-orbit interaction, which has been predicted to give rise to anomalous spin susceptibility. Our polarized inelastic neutron scattering measurements in the normal phase of the heavy-fermion superconductor CePt3 Si confirm this prediction. We find that for a finite wave vector along the crystallographic a-direction the spin susceptibility χaa is different from χbb by a factor of two. The effect is even larger than in theoretical calculations based on the Hubbard model, and we speculate that this is due to the strong spin-orbit coupling of rare-earth heavy fermions.
- Publication:
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Journal of the Physical Society of Japan
- Pub Date:
- June 2014
- DOI:
- 10.7566/JPSJ.83.063703
- Bibcode:
- 2014JPSJ...83f3703F