Strong impurities freezing nematicity in underdoped d
-wave high–temperature superconductors
Yu-Yo Chen1*, Yuanyuan Zhao2, Ching-Yu Huang3, Hong-Yi Chen1, Chung-Yu Mou4
1Department of Physics, National Taiwan Normal University, Taipei, 116, Taiwan
2Department of Physics and Texas Center for Superconductivity, University of Houston, Houston, Texas 77204, USA
3C. N. Yang Institute for Theoretical Physics and Department of Physics and Astronomy, State University of New York at Stony Brook, NY 11794-3840, USA
4Department of Physics, National Tsing-Hua University, Hsinchu, 301, Taiwan
* presenting author:Yu-Yo Chen,
Impurity effect on the high-Tc superconductors is the current focus of research in condensed matter physics. From the effective mean-field t-t'-U-V Hamiltonian model based on stripe phase induced by antiferromagnetic ordering (underdoped region), we use Bogoliubov-de Gennes’ (BdG) theory and dopant multiple non-magnetic impurities. The results indicate that quasi one-dimensional stripe is pinned by nonmagnetic impurities in the system. In addition, with the increasing of impurity concentration, the system generates the phase transition (stripe-smectic-nematic). Thus, the paper will show the spatial distribution of order parameters using the self-consistent field method. In the two different systems (pure d-wave superconductivity and stripe system), we will follow the standard linear-response approach to investigate disorder effects on the density of states and the superfluid density.

Keywords: stripe phase , smectic, nematic, d-wave superconductivity , superfluid density