Mid-infrared reflectivity of single crystal Nd2−xCexCu4O4−y

Watanabe, Yoshihisa; Wang, Z.Z.; Lyon, S. A.; Ong, N. P.; Tsui, D. C.; Tarascon, J. M.; Wang, E.

doi:10.1016/0038-1098(90)90930-a

Cited by 15 publications

(1 citation statement)

References 12 publications

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“…It is worth mentioning that the Drude model explains the reflectivity profiles of PCCO 25) much better than, for example, YBa 2 Cu 3 O 7 . 26) The plasma frequency derived from those reflectivity spectra was found to be 19700 cm ¹1 or an electron density of 4:4 Â 10 21 m Ã 1 =m 0 cm ¹3 , where m Ã 1 =m 0 is the effective mass ratio in the electron band. Hence, both µ and the reflectivity data suggest that the electron band comprises weakly correlated quasiparticles that behave much like carriers in a conventional disordered metal.…”

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confidence: 95%

Superconductivity in cuprates with square-planar coordinated copper driven by hole carriers

Krockenberger

Irie

Yan

et al. 2014

Appl. Phys. Express

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We present evidence that the cosmological mean metallicity of neutral atomic hydrogen gas shows a sudden decrease at z > 4.7 down to Z = −2.03 +0.09 −0.11 , which is 6σ deviant from that predicted by a linear fit to the data at lower redshifts. This measurement is made possible by the chemical abundance measurements of eight new damped Lyα (DLA) systems at z > 4.7 observed with the Echellette Spectrograph and Imager on the Keck II Telescope, doubling the number of measurements at z > 4.7 to 16. Possible explanations for this sudden decrease in metallicity include a change in the physical processes that enrich the neutral gas within disks, or an increase of the covering factor of neutral gas outside disks due to a lower ultraviolet radiation field and higher density at high redshift. The later possibility would result in a new population of presumably lower metallicity DLAs, with an increased contribution to the DLA population at higher redshifts resulting in a reduced mean metallicity. Furthermore, we provide evidence of a possible decrease at z > 4.7 in the comoving metal mass density of DLAs, ρ metals (z) DLA , which is flat out to z ∼ 4.3. Such a decrease is expected, as otherwise most of the metals from star-forming galaxies would reside in DLAs by z ∼ 6. While the metallicity is decreasing at high redshift, the contribution of DLAs to the total metal budget of the universe increases with redshift, with DLAs at z ∼ 4.3 accounting for ∼20% as many metals as produced by Lyman break galaxies.

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confidence: 95%

Superconductivity in cuprates with square-planar coordinated copper driven by hole carriers

Krockenberger

Irie

Yan

et al. 2014

Appl. Phys. Express

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Mid-IR Reflectivity of Single-Crystals Bi2Sr2CuOy, Bi2Mm+1ComOy (M=Ca,Sr,Ba; m=1,2), Bi2Sr3Fe2O9.2 and Bi2Sr2MnO6.25

Watanabe

Ong

Tsui

et al. 1991

Advances in Superconductivity III

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Far-infrared and mid-infrared absorption in (Bi,Pb)-Sr-(Ca,Y)-Cu-O

Calvani

Capizzi

Dore

et al. 1993

Int J Infrared Milli Waves

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The reflectivities of seven films belonging to the Bi-Sr-CaCu-O family, with T c ranging from 60 to 95 K, and of a single crystal of insulating Bi-Sr-Y-Cu-O, have been measured at room temperature in the normal phase. The optical conductivity has been analyzed in terms of Drude (D), mid-infrared (MIR), and charge-transfer (CT) contributions. As T c increases, the spectral weight within the charge-transfer gap (D+MIR) increases. Meanwhile, the peak frequency of the MIR band moves towards the far-infrared and the optical conductivity becomes more similar to that of a "normal" metal. 251

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Mid-infrared reflectivity of single crystal Nd2−xCexCu4O4−y

Cited by 15 publications

References 12 publications

Superconductivity in cuprates with square-planar coordinated copper driven by hole carriers

Superconductivity in cuprates with square-planar coordinated copper driven by hole carriers

Mid-IR Reflectivity of Single-Crystals Bi2Sr2CuOy, Bi2Mm+1ComOy (M=Ca,Sr,Ba; m=1,2), Bi2Sr3Fe2O9.2 and Bi2Sr2MnO6.25

Far-infrared and mid-infrared absorption in (Bi,Pb)-Sr-(Ca,Y)-Cu-O

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