Theory of the in-plane anisotropy of magnetic excitations in YBa2Cu3O6+y

作者: Hiroyuki Yamase , Walter Metzner

DOI: 10.1016/J.PHYSC.2007.03.429

关键词:

摘要: Abstract A pronounced xy -anisotropy was observed in recent neutron scattering experiments for magnetic excitations untwinned YBa 2 Cu 3 O 6+ y (YBCO). The small anisotropy of the bare band structure due to orthorhombic crystal symmetry seems be enhanced by correlation effects. natural possibility is that system close a Pomeranchuk instability associated with d-wave Fermi surface deformation (dFSD). We investigate this bilayer t – J model within self-consistent slave-boson mean-field theory. show dFSD correlations drive at low doping and relatively high temperatures, providing scenario optimally doped as well underdoped YBCO, including pseudogap phase.

参考文章(7)
Hiroyuki Yamase, Hiroshi Kohno, Possible Quasi-One-Dimensional Fermi Surface in La2-xSrxCuO4. Journal of the Physical Society of Japan. ,vol. 69, pp. 332- 335 ,(2000) , 10.1143/JPSJ.69.332
J. M. Tranquada, B. J. Sternlieb, J. D. Axe, Y. Nakamura, S. Uchida, Evidence for stripe correlations of spins and holes in copper oxide superconductors Nature. ,vol. 375, pp. 561- 563 ,(1995) , 10.1038/375561A0
C. Stock, W. J. L. Buyers, R. Liang, D. Peets, Z. Tun, D. Bonn, W. N. Hardy, R. J. Birgeneau, Dynamic stripes and resonance in the superconducting and normal phases ofYBa2Cu3O6.5ortho-II superconductor Physical Review B. ,vol. 69, pp. 014502- ,(2004) , 10.1103/PHYSREVB.69.014502
Christoph J. Halboth, Walter Metzner, d-wave superconductivity and pomeranchuk instability in the two-dimensional hubbard model Physical Review Letters. ,vol. 85, pp. 5162- 5165 ,(2000) , 10.1103/PHYSREVLETT.85.5162
V. Hinkov, S. Pailhès, P. Bourges, Y. Sidis, A. Ivanov, A. Kulakov, C. T. Lin, D. P. Chen, C. Bernhard, B. Keimer, Two-dimensional geometry of spin excitations in the high-transition-temperature superconductor YBa2Cu3O6+x. Nature. ,vol. 430, pp. 650- 654 ,(2004) , 10.1038/NATURE02774
Hiroyuki Yamase, Hiroshi Kohno, Instability toward Formation of Quasi-One-Dimensional Fermi Surface in Two-Dimensional t-J Model Journal of the Physical Society of Japan. ,vol. 69, pp. 2151- 2157 ,(2000) , 10.1143/JPSJ.69.2151