Origin of the T c -depression in ultrathin YBCO

Cieplak, Marta Z.; Guha, Saikat; Vadlamannati, S.; Nien, C.-H.; Lindenfeld, P.

doi:10.1117/12.179146

Cited by 9 publications

(21 citation statements)

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“…After the LW procedures the film's illuminated areas exhibited J c , T c , and the first critical magnetic field H c1 comparatively lower than those of the sample without the LW lines [13].…”

Section: Samples and Experimental Setupmentioning

confidence: 85%

Investigation of Optically Modified YBa2Cu3O7–x Films by Means of X-ray Microanalysis Technique

Jukna

Steponavičienė

Maneikis

et al. 2014

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This work reports on investigation of remnant oxygen content in optically-modified regions of 0.3-μm-thick YBa 2 Cu 3 O 7-x films, patterned by a laser-writing technique in an inert ambient gas atmosphere at room temperature. A laser-treated region of weak superconductivity with dimensions depending on the size of a laser spot, laser power, and initial content of oxygen is characterized by a lower oxygen content, weaker critical magnetic field, and suppressed both the superconducting critical temperature and the critical current density, as compared to the laser untreated regions. Optically induced (cw-laser, 532-nm-wavelength) heating strongly affects a non-uniform distribution of remnant oxygen content in the film, depending both on the optical power and beam's scanning velocity. A level of oxygen depletion and the size of the oxygen-deficient region have been directly estimated from scanning-electron-microscope spectra with the X-ray microanalysis technique. The results of our measurements were compared with results extracted from electric measurements, assuming a correlation between the remnant oxygen content and the electric transport properties of oxygen-deficient YBa 2 Cu 3 O 7-x films. Keywords: YBa 2 Cu 3 O 7-x superconducting thin films, oxygen deficient superconductor, remnant oxygen content, light interaction with superconducting material, laser-writing technique.

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Section: Samples and Experimental Setupmentioning

confidence: 85%

Investigation of Optically Modified YBa2Cu3O7–x Films by Means of X-ray Microanalysis Technique

Jukna

Steponavičienė

Maneikis

et al. 2014

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“…The observation that one unit cell thickness is the lower limit for superconductivity in ultra-thin films [3] gives support to this assumption. The onset temperature of the transition, T c,onset , is not lowered as much as T c,0 [3] and seems to be sample-dependent [2][3][4][5]. On the other hand, no degradation of T c,onset was observed in [(Ba 0.9 , Nd 0.1 )CuO 2 ] m /[CaCuO 2 ] 2 superlattices with decreasing m [8] or when the buffer layer between the substrate and the YBCO film was specially chosen [9].…”

Section: Introductionmentioning

confidence: 88%

“…The broadening of the transition has been attributed to unbound vortex-antivortex pairs induced in the films above the Kosterlitz-Thouless transition [5,6]. The depression of T c,0 has been explained by insufficient coupling between the CuO 2 -layers [2]. The observation that one unit cell thickness is the lower limit for superconductivity in ultra-thin films [3] gives support to this assumption.…”

Section: Introductionmentioning

confidence: 98%

“…The superconductivity of high-temperature superconductors (HTS) is essentially associated with the CuO 2 -layers in the crystal structure [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

“…Investigations of ultra-thin YBa 2 Cu 3 O 6+x (YBCO) films have shown that, when the thickness of the film is decreased the zero-resistance transition temperature T c,0 decreases and the transition width increases [2][3][4][5][6][7]. The broadening of the transition has been attributed to unbound vortex-antivortex pairs induced in the films above the Kosterlitz-Thouless transition [5,6].…”

Section: Introductionmentioning

confidence: 99%

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Size-dependent properties of YBa₂Cu₃O_6 xnanopowder

Paturi

Raittila

Huhtinen

et al. 2003

J. Phys.: Condens. Matter

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YBa2Cu3O6+x nanopowder, prepared by the citrate sol–gel method, is segregated by sedimentation in ethanol into three size groups with average particle heights of 0.7, 1.6 and 2.3 nm. The structural properties and composition of the powders, investigated by x-ray diffraction, atomic force microscopy, Auger electron spectroscopy and EPR-spectroscopy, show no clear differences, except the size. According to investigations by magnetometry and by non-resonant microwave absorption the as-prepared powder contains weak links which, however, disappear during the segregation. The magnetic susceptibility of the samples decreases with the decreasing particle size, in agreement with the susceptibility values calculated from the London equations for cylindrical particles smaller than the London penetration depth. In all three size groups the critical temperature of superconductivity is 92 K.

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