Polarised X-ray absorption (XAS) measurements have been made on high-quality superconducting Bi2Sr2CaCu2O8+y (Bi2212) single crystals to investigate the microscopic electronic structure in the normal and superconducting state of the system. The Cu L(3) XAS results led us to conclude that either there are no holes of 3d(z)2 symmetry, or if any, they are insignificant in number. On the other hand, the O K XAS results show the presence of a significant density of p(z) symmetry orbitals for itinerant holes. An increase in the 3d(9)L/3d(9) ratio estimated from the Cu L(3) XAS measurements was observed while going from the normal to the superconducting state of the system. The results are discussed in the light of the structural distortions taking place below T-c.
Electronic Structure Studies of the Bi2212 System by Polarised X-ray Absorption Measurement / Saini, Naurang Lal; D. S. L., Law; P., Pudney; P., Srivastava; A. A., Menovsky; J. J. M. FRANSE, H. OHKUBO; M., Akinaga; F., Studer; K. B., Garg. - In: PHYSICA. C, SUPERCONDUCTIVITY. - ISSN 0921-4534. - STAMPA. - 251:(1995), pp. 7-14. [10.1016/0921-4534(95)00354-1]
Electronic Structure Studies of the Bi2212 System by Polarised X-ray Absorption Measurement
SAINI, Naurang Lal;
1995
Abstract
Polarised X-ray absorption (XAS) measurements have been made on high-quality superconducting Bi2Sr2CaCu2O8+y (Bi2212) single crystals to investigate the microscopic electronic structure in the normal and superconducting state of the system. The Cu L(3) XAS results led us to conclude that either there are no holes of 3d(z)2 symmetry, or if any, they are insignificant in number. On the other hand, the O K XAS results show the presence of a significant density of p(z) symmetry orbitals for itinerant holes. An increase in the 3d(9)L/3d(9) ratio estimated from the Cu L(3) XAS measurements was observed while going from the normal to the superconducting state of the system. The results are discussed in the light of the structural distortions taking place below T-c.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
