2007/10/29 by O. P. Sushkov, Wenhui Xie, O. Jepsen +2 · 5 citations
Chemistry · Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Anisotropy #Chemistry #Condensed matter physics #Crystal structure #Crystallography #Lattice (music) #Magnetic and transport properties of perovskites and related materials #Optics #Orthorhombic crystal system #Physics #Physics of Superconductivity and Magnetism #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.77.035124
published in Physical Review B 77(3) (American Physical Society)
arxiv created 2007/10/29 · openalex publication_date 2008/01/18 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
Due to the orthorhombic distortion of the lattice, the electronic hopping integrals along the a and b diagonals, the orthorhombic directions, are slightly different. We calculate their difference in the local density approximation and find ta^\ensuremath'\ensuremath-tb^\ensuremath'\ensuremath≈8\phantom\rule0.3em0exmeV. We argue that electron correlations in the insulating phase of La_2\ensuremath-xSrxCuO4, i.e., at doping x\ensuremath\leqslant0.055, dramatically enhance the (ta^\ensuremath'\ensuremath-tb^\ensuremath')-splitting between the a- and b-hole valleys. In particular, we predict that the intensity of both angle-resolved photoemission and optical absorption is very different for the a- and b-nodal points.