Defect mechanism of photoinduced superconductivity in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi mathvariant="normal">Y</mml:mi><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Ba</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Cu</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">O<

Federici, John F.; Chew, D.; Welker, B.; Savin, W.; Gutierrez-Solana, J.; Fink, T.; Wilber, W. D.

doi:10.1103/physrevb.52.15592

Cited by 43 publications

(16 citation statements)

References 20 publications

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“…Commercial equipment for measuring the luminescence of semiconductors where the intensity of emission is typically 10 5 times higher than in metals often use coloured glass filters, monochromators and predispersers 9,10 . However monochromators and predispersers can reduce the emission intensity for a metal to below the sensitivity of the detector.…”

Section: Design Of Low Luminescence Equipmentmentioning

confidence: 99%

Photoluminescence of gold, copper and niobium as a function of temperature

Armstrong

Halliday

Hampshire

2009

Journal of Luminescence

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The full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. Keywords:Photoluminescence, gold, copper, niobium, emission-spectra, purity AbstractA specially constructed instrument for measuring the low intensity photoluminescence emission spectra of metals is described. It uses low luminescence optical components and dedicated sample mounting techniques. Room temperature measurements agree closely with literature spectra for high purity gold and are found to be sensitive to 100 p.p.m. impurities. Detailed spectra are presented, which are weakly temperature dependent, for gold, copper and unpolished niobium between room temperature and 100 K. We conclude that this work provides accurate luminescence data for Au from 300 K down to 100 K. Although the (variable temperature) luminescence data for Cu are consistent both with the room temperature experimental data in the literature and theory, we conclude the role of surface adsorbates and/or oxides cannot be ruled out. Theory suggests that Nb has a factor ~50 lower luminescence intensity than Au and Cu because the real part of the refractive index is a factor ~5 higher and the density of states ~2 eV below the Fermi energy is a factor of ~4 lower than Au and Cu. Measurements are presented for unpolished Nb, but given the lack of signal detection for polished Nb and that theory predicts very weak signals, we conclude that the luminescence signals from pure Nb still remain below the sensitivity of our instrument.

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Section: Design Of Low Luminescence Equipmentmentioning

confidence: 99%

Photoluminescence of gold, copper and niobium as a function of temperature

Armstrong

Halliday

Hampshire

2009

Journal of Luminescence

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“…Indeed, electronic excitations in the visible regime have been observed in luminescence spectra of YBCO 6ϩx . 42,43 They have been related to photogeneration of charges which play an important role in the persistent photoconductivity. 43 The latter authors suggest that oxygen vacancies in the Cu͑1͒-O͑1͒ chains act as F centers which trap photoexcited electrons.…”

Section: ͑8͒mentioning

confidence: 99%

“…42,43 They have been related to photogeneration of charges which play an important role in the persistent photoconductivity. 43 The latter authors suggest that oxygen vacancies in the Cu͑1͒-O͑1͒ chains act as F centers which trap photoexcited electrons. These F centers may play a similar role in the desorption of oxygen from the surface as excitons do in ZnO.…”

Section: ͑8͒mentioning

confidence: 99%

Desorption of oxygen fromYBa2Cu3
Böck
¹
,
Kürsten
²
,
Brühl
³

et al. 1996
Phys. Rev. B

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Phonons of laser-deposited YBa 2 Cu 3 O 6ϩx films on MgO͑100͒ substrates are investigated in a Raman setup as a function of laser power density. Investigations of YBa 2 Cu 3 O 7 films allow us to study oxygen out-diffusion, where the onset of out-diffusion is indicated by the appearance of disorder-induced modes in the Raman spectra. At a pressure of 5ϫ10 Ϫ6 mbar the temperature threshold of the out-diffusion is (490Ϯ15) K. With increasing oxygen pressure the observed temperature thresholds rise only moderately in contrast to the behavior expected from the p ox -T phase diagram of YBa 2 Cu 3 O 6ϩx . Even at 1 bar oxygen partial pressure outdiffusion is observed and tetragonal sites with xϭ0 develop. These observations can be explained by photonstimulated desorption of oxygen. Investigations of YBa 2 Cu 3 O 6 films allow us to study oxygen in-diffusion. In 1 bar oxygen we observe competing oxygen fluxes due to thermally activated diffusion and photon-stimulated desorption. From these measurements we determine an upper bound of the thermal activation energy of the oxygen in-diffusion into YBa 2

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“…For example, the similarity between time scales for oxygen ordering and PPC relaxation, 3 and the similar oxygen content dependence of the maximum induced change in T c by photoexcitation and by oxygen disorder, 6 have been used as arguments in favor of photoassisted oxygen ordering. On the other hand, the existence of a monotonic behavior for the ⌬/ vs oxygen content curve, 9 the existence of a peak in the photoexcitation efficiency for UV illumination, 4 and the correlation between the efficiency curve and the photoluminescence spectra 10 have been used as arguments in favor of electron trapping in oxygen vacancies.…”

mentioning

confidence: 99%

Interrelation between persistent photoconductivity and oxygen order inGdBa2Cu3O<

et al. 1997

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We study the metastable states induced by photoexcitation, oxygen disorder, and both effects combined, in superconducting GdBa 2 Cu 3 O x thin films. The states are identified by the temperature dependence of the resistivity. The relaxation dynamics is characterized through the time evolution of the conductivity. The results show that photoexcitation and oxygen disorder behave as noninteracting and do not cancel each other out. However, in both cases the relaxation dynamics is related to oxygen movement. ͓S0163-1829͑97͒09131-5͔

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Defect mechanism of photoinduced superconductivity inYBa2Cu3O<

Cited by 43 publications

References 20 publications

Photoluminescence of gold, copper and niobium as a function of temperature

Photoluminescence of gold, copper and niobium as a function of temperature

Desorption of oxygen fromYBa2Cu3
Böck
¹
,
Kürsten
²
,
Brühl
³

et al. 1996
Phys. Rev. B

Interrelation between persistent photoconductivity and oxygen order inGdBa2Cu3O<

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Defect mechanism of photoinduced superconductivity inYBa2Cu3O<

Cited by 43 publications

References 20 publications

Photoluminescence of gold, copper and niobium as a function of temperature

Photoluminescence of gold, copper and niobium as a function of temperature

Desorption of oxygen fromYBa2Cu3Böck1, Kürsten2, Brühl3 et al. 1996Phys. Rev. B

Interrelation between persistent photoconductivity and oxygen order inGdBa2Cu3O<

Contact Info

Product

Resources

About

Desorption of oxygen fromYBa2Cu3
Böck
¹
,
Kürsten
²
,
Brühl
³

et al. 1996
Phys. Rev. B