Optical investigation of the metal-insulator transition in NdBa2Cu3Ox A comparison with YBa2Cu3Ox

Widder, K.; Berner, D.; Geserich, H. P.; Widder, W.; Braun, H.F.

doi:10.1016/0921-4534(95)00423-8

Cited by 35 publications

(12 citation statements)

References 6 publications

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“…7 43 as mentioned above. The NEXAFS data are corrected for selfabsorption and saturation effects and normalized to the cross section of the actual oxygen content.…”

Section: Resultsmentioning

confidence: 99%

X-ray absorption spectroscopy of detwinnedPrxY1−

et al. 1997

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UvA-DARE is a service provided by the library of the University of Amsterdam (http://dare.uva.nl) UvA-DARE (Digital Academic Repository)X-ray absorption spectroscopy of detwinned PrxY1-xBa2Cu3O7-y single crystals: electronic structure and hole distribution Merz, M.; Nücker, N.; Pellegrin, E.; Schweiss, P.; Schuppler, S.; Kielwein, M.; Knupfer, M.; Golden, M.S.; Fink, J. General rightsIt is not permitted to download or to forward/distribute the text or part of it without the consent of the author(s) and/or copyright holder(s), other than for strictly personal, individual use, unless the work is under an open content license (like Creative Commons). Disclaimer/Complaints regulationsIf you believe that digital publication of certain material infringes any of your rights or (privacy) interests, please let the Library know, stating your reasons. In case of a legitimate complaint, the Library will make the material inaccessible and/or remove it from the website. Please Ask the Library: http://uba.uva.nl/en/contact, or a letter to: Library of the University of Amsterdam, Secretariat, Singel 425, 1012 WP Amsterdam, The Netherlands. You will be contacted as soon as possible. Substituting Y in orthorhombic ͑Y,R)Ba 2 Cu 3 O 7 by any rare-earth element R has generally little effect on the superconducting properties. For RϭPr, however, superconductivity is completely suppressed. To understand this effect we have studied the unoccupied electronic structure of Pr x Y 1Ϫx Ba 2 Cu 3 O 7Ϫy (xϭ0.0, 0.4, 0.8) using polarization-dependent O 1s near-edge x-ray absorption spectroscopy of detwinned single crystals. We identify the hole states in the CuO 2 planes and the CuO 3 chains and give estimates of the relative contributions of the O 2p x , O 2p y , and O 2p z orbitals to these states. Along with the comparison of oxygen-rich (yϷ0.1) to the oxygen-depleted materials (yϷ0.9), this allows a test of the current theoretical explanations for the Pr-induced suppression of superconductivity. While we can rule out models involving hole filling or charge transfer between the planes and the chains, our data are consistent with approaches based on Pr 4f -O 2p hybridization. ͓S0163-1829͑97͒03313-4͔

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“…7 43 as mentioned above. The NEXAFS data are corrected for selfabsorption and saturation effects and normalized to the cross section of the actual oxygen content.…”

Section: Resultsmentioning

confidence: 99%

X-ray absorption spectroscopy of detwinnedPrxY1−

et al. 1997

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“…Indeed, the fluctuation paraconductivity alongside with the pseudogap anomaly [4,5], the metal-insulator transition [6,7] and incoherent transport [8,9] relates to the unusual phenomena inherent to HTSC compounds in the normal state. According to present-day views these phenomena can be the key to understanding the nature of HTSC, see e.g.…”

Section: Introductionmentioning

confidence: 99%

Effect of high pressure on the fluctuation paraconductivity in Y0.95Pr0.05Ba2Cu3O7−δ single crystals

Вовк

Vovk

Khadzhai

et al. 2014

Current Applied Physics

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“…The labile component, in turn, conduces to the B O. V. Dobrovolskiy Dobrovolskiy@Physik.uni-frankfurt.de 1 V. Karazin National University, Kharkiv 61077, Ukraine appearance in the structure of the so-called "non-equilibrium" state [13,14] which can be relatively easily induced by application of a high pressure [15,16] or an abrupt temperature change [17,18]. The relaxation processes appearing in this state essentially affect the critical and electro-transport parameters of the compound, thereby suppressing or, on the contrary, enhancing the above-named peculiarities observed in the normal state [19][20][21].…”

Section: Introductionmentioning

confidence: 98%

“…The study of the appearance conditions and the mechanisms of transitions of the metal-insulator type [1,2], the incoherent electronic transport [3,4], as well as the fluctuation [5,6] and pseudogap [7][8][9] anomalies represents one of the primary research lines in the physics of high-temperature superconductivity (HTSC). According to the present day views [10], these non-trivial phenomena observed in HTSC compounds in the normal (non-superconducting) state may be the key to understand the microscopic nature of HTSC.…”

Section: Introductionmentioning

confidence: 99%

Effect of Structural Relaxation on the Metal–Insulator Transition in Heavily Underdoped YBa $$_2$$ 2 Cu $$_3$$ 3 O $$_{7-\delta }$$ 7 - δ Single Crystals

et al. 2015

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We report the results of a study of the effect of structural relaxation on the basal-plane conductivity of heavily underdoped high-T c YBa 2 Cu 3 O 7−δ single crystals. An increase of the oxygen deficiency in YBa 2 Cu 3 O 7−δ has been found to strengthen localization effects and to lead to the realization of a transition of the metal-insulator type, which always precedes the superconducting transition. In addition, a 5-day roomtemperature annealing of the samples has been revealed to result in a notable shift of the metal-insulator transition point toward higher temperatures.

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Optical investigation of the metal-insulator transition in NdBa2Cu3Ox A comparison with YBa2Cu3Ox

Cited by 35 publications

References 6 publications

X-ray absorption spectroscopy of detwinnedPrxY1−

X-ray absorption spectroscopy of detwinnedPrxY1−

Effect of high pressure on the fluctuation paraconductivity in Y0.95Pr0.05Ba2Cu3O7−δ single crystals

Effect of Structural Relaxation on the Metal–Insulator Transition in Heavily Underdoped YBa $$_2$$ 2 Cu $$_3$$ 3 O $$_{7-\delta }$$ 7 - δ Single Crystals

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