Far-Infrared Conductivity of the High-TcSuperconductor YBa2

Bonn Da

¹

,

Greedan Je

²

,

C. V. Stager

³

et al.

Superconducting Energy Gap andc-Axis Plasma Frequency of(Nd,Sm)FeAsO0.82F0.18Dubroka1, Kim2, Rössle3 et al. 2008Phys. Rev. Lett.5811520View full textAdd to dashboardCite

“…In particular, it was established that thanks to the very large electronic anisotropy of the cuprates, the pronounced features of the reflectivity spectra are representative of the weakly conducting c-axis response. The metallic ab-plane component merely gives rise to a moderate increase of the overall magnitude of the conductivity with respect to the one of c-axis component [14,15,16,17,18,19]. This interpretation has been confirmed by direct measurements of the in-plane and c-axis response on single crystals [15,17].…”

“…This interpretation has been confirmed by direct measurements of the in-plane and c-axis response on single crystals [15,17]. Accordingly, measurements on polycrystals can provide reliable information, for example on the eigenfrequency of the caxis phonon modes, the upper limit of the c-axis plasma frequency of the SC condensate, ω SC pl , and the magnitude of the SC energy gap, ∆ [14,15,16,17,18,19].…”

Far-infrared reflectivity of sintered YBa2Cu3O7 in the normal and superconducting state

“…For sintered La-Sr-Cu--O compounds energy gaps (for T<TJ of 2A/kT~"3.5 [4][5][6][7][8][9][10][11] and for sintered YBa2Cu307 values between 2.3 and 3.5 have been reported [12][13][14][15][16][17][18][19][20][21][22]. From a recent reflectivity study of single crystal platelets on a copper surface Schlesinger In this paper we report far-infrared reflection measurements for a sintered YBazCu30 7 sample that contained a large amount of preferentially oriented crystallites with the a-b plane almost parallel to the sample surface and that showed extraordinary high far-infrared reflectivity.…”

Preparation, characterization, and far-infrared study of ceramic high-Tc superconductors

“…[8][9][10][11][12][13][14][15][16][17][18][19]) and a few studies of Y2BaCu05 (Refs. 18, 20, and 21); a systematic far-infrared study of a mixed-phase sample was reported in Ref.…”