%0 Generic %1 yamakawa2012zigzag %A Yamakawa, Youichi %A Onari, Seiichiro %A Kontani, Hiroshi %D 2012 %K fluctuation orbital superconductor %T Zigzag chain structure transition and orbital fluctuations in Ni-based superconductors %U http://arxiv.org/abs/1211.3944 %X We investigate the electronic state and structure transition of BaNi2As2, which shows a similar superconducting phase diagram as Fe-based superconductors. We construct the ten-orbital tight-binding model for BaNi2As2 by using the maximally localized Wannier function method. The Coulomb and quadrupole-quadrupole interactions are treated within the random-phase approximation. We find that the charge susceptibility of quadrupole O_X2-Y2 has the largest peak structure at q = (pi, 0, pi) which is derived from both the in-plane and out-of-plane oscillations of Ni ions. We propose that the antiferro-quadrupole O_X2-Y2 order with q = (pi, 0, pi) is the origin of the zigzag chain structure reported in experiments. The obtained antiferro-quadrupole fluctuations would then be the origin of the strong coupling superconductivity in Ni-based superconductors. We identify similarities and differences between Ni- and Fe-based superconductors.

@misc{yamakawa2012zigzag, abstract = {We investigate the electronic state and structure transition of BaNi2As2, which shows a similar superconducting phase diagram as Fe-based superconductors. We construct the ten-orbital tight-binding model for BaNi2As2 by using the maximally localized Wannier function method. The Coulomb and quadrupole-quadrupole interactions are treated within the random-phase approximation. We find that the charge susceptibility of quadrupole O_{X2-Y2} has the largest peak structure at q = (pi, 0, pi) which is derived from both the in-plane and out-of-plane oscillations of Ni ions. We propose that the antiferro-quadrupole O_{X2-Y2} order with q = (pi, 0, pi) is the origin of the zigzag chain structure reported in experiments. The obtained antiferro-quadrupole fluctuations would then be the origin of the strong coupling superconductivity in Ni-based superconductors. We identify similarities and differences between Ni- and Fe-based superconductors.}, added-at = {2012-11-19T04:37:21.000+0100}, author = {Yamakawa, Youichi and Onari, Seiichiro and Kontani, Hiroshi}, biburl = {https://www.bibsonomy.org/bibtex/2e2092d06f3068ac809b37d3561d7e27f/kyungminlee}, description = {Zigzag chain structure transition and orbital fluctuations in Ni-based superconductors}, interhash = {8721f6c31fe3a48789d9643bbfefb3cf}, intrahash = {e2092d06f3068ac809b37d3561d7e27f}, keywords = {fluctuation orbital superconductor}, note = {cite arxiv:1211.3944Comment: 7 pages, 5 figures}, timestamp = {2012-11-19T04:37:21.000+0100}, title = {Zigzag chain structure transition and orbital fluctuations in Ni-based superconductors}, url = {http://arxiv.org/abs/1211.3944}, year = 2012 }