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Reduction of the spin susceptibility in the superconducting state of Sr2RuO4 observed by polarized neutron scattering
- Source :
- Phys. Rev. Lett. 125, 217004 (2020)
- Publication Year :
- 2020
-
Abstract
- Recent observations [A.~Pustogow et al. Nature 574, 72 (2019)] of a drop of the $^{17}$O nuclear magnetic resonance (NMR) Knight shift in the superconducting state of Sr$_2$RuO$_4$ challenged the popular picture of a chiral odd-parity paired state in this compound. Here we use polarized neutron scattering to show that there is a $34 \pm 6$ % drop in the magnetic susceptibility at the ruthenium site below the superconducting transition temperature. Measurements are made at lower fields $H \sim \tfrac{1}{3} H_{c2}$ than a previous study allowing the suppression to be observed. Our results are consistent with the recent NMR observations and rule out the chiral odd-parity $\mathbf{d}=\hat{\mathbf{z}}(k_x\pm ik_y)$ state. The observed susceptibility is consistent with several recent proposals including even-parity $B_{1g}$ and odd-parity helical states.<br />Comment: New version with Supplementary Material discussing orbital contributions to the susceptibility, Fermi liquid corrections and a two fluid model
Details
- Database :
- arXiv
- Journal :
- Phys. Rev. Lett. 125, 217004 (2020)
- Publication Type :
- Report
- Accession number :
- edsarx.2002.02856
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1103/PhysRevLett.125.217004