Pseudogap enhancement due to magnetic impurities in d-density waves

TL;DR

This paper investigates how magnetic impurities can enhance the pseudogap in d-density wave states, showing that impurity interactions increase the order parameter and transition temperature, aligning with recent experimental findings.

Contribution

It demonstrates that coherent magnetic impurity interactions can enhance the pseudogap in d-density wave systems, providing a theoretical explanation for experimental observations.

Findings

Order parameter and transition temperature increase with magnetic impurities.

Coherent impurity-spin alignment affects d-SDW properties.

Results explain recent experimental pseudogap enhancement data.

Abstract

We study the effect of quantum magnetic impurities on d-wave spin density waves (d-SDW). The impurity spins are aligned coherently according to the spin space anisotropy of the condensate. Both the order parameter and transition temperature increases due to the coherent interplay between magnetic scatterers and d-SDW. This can explain the recent experimental data on the pseudogap enhancement of Ni substituted NdBa_2{Cu_{1-y}Ni_y}O_6.8 from Pimenov et al. (Phys. Rev. Lett. 94, 227003 (2005)).