Inherent spin density wave instability by vortices in superconductors with strong Pauli effects

Details Inherent spin density wave instability by vortices in superconductors with strong Pauli effects Inherent spin density wave instability by vortices in superconductors with strong Pauli effects

2010-09-15

arxiv.org/abs/1009.2821v1

Phys. Rev. B 83, 140503(R) (2011)

Physics

Condensed Matter

Superconductivity

5 pages, 3figures

Scientific paper

10.1103/PhysRevB.83.140503

A novel spin density wave (SDW) instability mechanism enhanced by vortices under fields is proposed to explain the high field and low temperature (HL) phase in CeCoIn$_5$. In the vortex state the strong Pauli effect and the nodal gap conspire to enhance the momentum resolved spectral weight exclusively along the nodal direction over the normal value, providing a favorable nesting condition for SDW with ${\bf Q}=(2k_F, 2k_F, 0.5)$ only under high field ($H$). Observed mysteries of the field-induced SDW confined within $H_{c2}$ are understood consistently, such facts that ${\bf Q}$ is directed to the nodal direction independent of $H$, SDW diminishes under tilting field from the $ab$ plane, and the SDW transition line in $(H,T)$ has a positive slope.

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