Grazing Incidence Infrared Reflectivity of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">La</mml:mi></mml:mrow><mml:mrow><mml:mn>1.85</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Sr</mml:mi></mml:mrow><mml:mrow><mml:mn>0.15</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">CuO</mml:mi></mml:mrow><mml:mrow><mml:mn>4</mm

Somal, H. S.; Feenstra, B. J.; Schützmann, J.; Kim, Jae-Hoon; Barber, Z. H.; Duijn, V.H.M.; Hiền, Nguyễn Thị Minh; Menovsky, A.A.; Palumbo, Mario; Marel, D. van der

doi:10.1103/physrevlett.76.1525

Cited by 36 publications

(18 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The grazing incidence geometry has been chosen because in this case the reflectivity is more sensitive to changes of optical conductivity due to opening of the superconducting gap. This experimental technique has been previously used to measure the s-wave gap of NbN and the d-wave gap of La 1.85 Sr 0.15 CuO 4 [10]. In addition, normal incidence spectra were collected in the same frequency range, which were qualitatively consistent with the grazing reflectance data reported in this paper.…”

supporting

confidence: 71%

Optical measurements of the superconducting gap in MgB 2

et al. 2001

Self Cite

View full text Add to dashboard Cite

Abstract. Far-infrared reflectivity studies on the polycrystalline intermetallic compound MgB2 with a superconducting transition temperature Tc = 39 K were performed at temperatures 20 K to 300 K. We observe a significant raise of the superconducting-to-normal state reflectivity ratio below 70 cm −1 , with a maximum at about 25 − 30 cm −1 , which gives a lower estimate of the superconducting gap of 2∆(0)≈ 3 − 4 meV.

show abstract

supporting

confidence: 71%

Optical measurements of the superconducting gap in MgB 2

et al. 2001

Self Cite

View full text Add to dashboard Cite

show abstract

“…Some of the reported in-plane spectra show rich features in a far-infrared (FIR) region 13,14,15 , which are ascribed either to the LO-phonons 13 or to the excitation related to the polarons 14 . According to the variety of spectra, different values of the SC condensate were derived, ranging from 250 to 430 nm 10,11,12,13,14,15 in terms of the London penetration depth λ…”

Section: Introductionmentioning

confidence: 99%

In-plane optical conductivity ofLa2−xSrxCuO4: Reduced superconducting condensate and

et al. 2005

View full text Add to dashboard Cite

Temperature dependences of the optical spectra of La2−xSrxCuO4 with x=0.12 and 0.15 were carefully examined for a polarization parallel to the CuO2-plane over a wide frequency range down to 8 cm −1 . Selection of well-characterized crystals enabled us to measure purely in-plane polarized spectra without any additional peak. The weight of superconducting (SC) condensate estimated from the missing area in σ1(ω) well agrees with the estimate from the slope of σ2(ω) vs 1/ω plot, showing no evidence that the Ferrell-Glover-Tinkham sum-rule is violated in the optical spectrum. We demonstrate that the optically estimated SC condensate is much smaller than the value obtained from the µSR measurement of magnetic penetration depth. We also find an anomalous increase of conductivity in sub-millimeter region towards ω=0 below Tc, which suggests the microscopic inhomogeneity in the superconducting state. Both observations are discussed in relation with the inhomogeneous electronic state that might be inherent to high-Tc cuprates.

show abstract

“…The extracted T-dependence of ∆, with ∆(0) ≈ 0.75 THz (3.07 meV) and 2∆/k B T c ≈ 4.6, is shown in inset to panel b). ∆(T ) is plotted on top of TR, the transmissivity ratio T (ω, T )/T (ω, 16K), which is at each T normalized to its peak value (in a BCS SC, the transmissivity ratio peaks just above 2∆ [33]). Fig.…”

mentioning

confidence: 99%

Energy-Gap Dynamics of Superconducting NbN Thin Films Studied by Time-Resolved Terahertz Spectroscopy

et al. 2011

View full text Add to dashboard Cite

Using time-domain terahertz spectroscopy we performed direct studies of the photoinduced suppression and recovery of the superconducting gap in a conventional BCS superconductor NbN. Both processes are found to be strongly temperature and excitation density dependent. The analysis of the data with the established phenomenological Rothwarf-Taylor model enabled us to determine the bare quasiparticle recombination rate, the Cooper pair-breaking rate and the electron-phonon coupling constant, λ=1.1±0.1, which is in excellent agreement with theoretical estimates.

show abstract

Grazing Incidence Infrared Reflectivity ofLa1.85Sr0.15CuO4

Cited by 36 publications

References 31 publications

Optical measurements of the superconducting gap in MgB 2

Optical measurements of the superconducting gap in MgB 2

In-plane optical conductivity ofLa2−xSrxCuO4: Reduced superconducting condensate and

Energy-Gap Dynamics of Superconducting NbN Thin Films Studied by Time-Resolved Terahertz Spectroscopy

Contact Info

Product

Resources

About