Nonlocal effects on the microwave surface resistance of high-Tc superconductors

Two-fluid interpretation of the microwave conductivity ofYBa2Cu3Waldram1, Theopistou2, Porch3 et al. 1997Phys. Rev. B241150View full textAdd to dashboardCite

“…The situation is complicated in YBa 2 Cu 3 O 7Ϫ␦ by the fact that the Fermi surface is nearly two dimensional; as was pointed out by Chang and Scalapino, 14 for a completely layered material the electrons have no velocity in the c direction and all nonlocal effects disappear for currents flowing within the a-b plane. However, as noted by Zuccaro et al, 15 the c component of electron velocity cannot be ignored in YBa 2 Cu 3 O 7Ϫ␦ . Reference to the band structure Fermi surface 16 shows that in the dominant chain and plane bands the electronic excitations are moving at not more than 20°to the a-b planes and in most cases considerably less.…”

Microwave Surface Impedance of High Temperature Superconductors

“…The estimate does, however, point out a further complication to the electrodynamics. The mean free path I is of the order of, or exceeds, the penetration depth, which can lead to non-local effects in o\ 122 . This peculiar situation, where the penetration depth is local (£ -C A), but the surface resistance becomes non-local (/ ~ A), is not encountered in low T c superconductors.…”

Organometallic Clusters As Precursors for Metallic Nanoparticles: Effect of Cluster Size, Ligand Set, and Decomposition Method

“…The compounds Os 4 (μ-H) 4 (CO) 12 ( 2 ), Os 6 (CO) 18 ( 3 ), Os 2 (μ-I) 2 (CO) 6 ( 4 ), [Os(μ-I) 2 (CO) 2 ] n ( 5 ), Os 3 (CO) 11 (NCCH 3 ) ( 6 ), Os 3 (CO) 11 (EPh 3 ) (E = P ( 7 ) or Sb ( 8 )), Os 3 (CO) 10 (EPh 3 ) 2 (E = As ( 9 ) or Sb ( 10) ), RuOs 3 (μ-H) 2 (μ-CO) 2 (CO) 11 ( 14 ), and RuOs 3 (μ-H) 2 (μ-CO) 2 (CO) 10 (PPh 3 ) ( 15 ) were prepared according to reported procedures. Ru(CO) 5 ( 16 ) was prepared according to the literature method, except that dodecane was used as the solvent.…”