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Luo, Chih-Wei; Chen, M. H.; Chiu, Chi-Lin; Wu, Kaung‐Hsiung; Juang, Jenh‐Yih; Uen, T. M.; Lin, Jiunn‐Yuan; Gou, Y. S.

doi:10.1023/a:1022963605952

Cited by 8 publications

(5 citation statements)

References 6 publications

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“…The extensive studies of a -axis-oriented YBa 2 Cu 3 O x (YBCO) films have led to a number of publications on various aspects, ranging from the deposition of superconducting films for HTS electronic devices to the investigation of anisotropic properties of YBCO. − It is of fundamental importance to control the out-of-plane orientation of the YBCO layer; for instance, the coherence length in the ab plane is considerably different with that along the c -axis, leading to the application of a -axis films in Josephson junction devices. Because high-quality a -axis YBCO films are indispensable in practical applications, the growth parameter control is of great importance both in the conventional vapor-phase deposition and the liquid-phase epitaxy (LPE) technique.…”

Section: Introductionmentioning

confidence: 99%

Dominant Effect of Oxygen Enhancement on the Crystalline Orientation of YBa₂Cu₃O_x Film Prepared by Liquid-Phase Epitaxial Growth

Cai

Tang

Sun

et al. 2007

Crystal Growth & Design

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A pure oxygen atmosphere during liquid-phase epitaxial (LPE) growth of YBa2Cu3O x (YBCO) significantly affected the crystalline orientation of the grown films. In the previous investigation, only the c-axis-oriented YBCO film can be obtained from the melt with a 3.0:5.0 Ba:Cu ratio under a typical air atmosphere. However, in our present study, it was found that high-quality a-axis-oriented films readily grew from the flux with a 3.0:5.0 Ba:Cu ratio when the atmosphere was changed to pure oxygen. Furthermore, the growth “window” of a-axis films was obviously enlarged compared with experimental results in the air atmosphere. On the basis of the “surface migration” theory, we elucidate the origin of a-axis growth promotion by a suppression of the migration ability of the growth species in the melt with increasing content of oxygen.

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Section: Introductionmentioning

confidence: 99%

Dominant Effect of Oxygen Enhancement on the Crystalline Orientation of YBa₂Cu₃O_x Film Prepared by Liquid-Phase Epitaxial Growth

Cai

Tang

Sun

et al. 2007

Crystal Growth & Design

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“…The characterization and manipulation of the oxygen content on the films were discussed in detail elsewhere. [20][21][22][23] Briefly, the orientation alignment of each set of films is better than 97%. The orientation-and time-resolved femtosecond spectroscopy was carried out by the pump-probe scheme with 20 fs pulses at a central wavelength of 800 nm, as described in Ref.…”

Section: Experimental Setup and Resultsmentioning

confidence: 99%

Spatial dichotomy of quasiparticle dynamics in underdoped thin-filmYBa2Cu3O7−δsuperconductors

et al. 2006

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By the spatial-temporal-resolved femtosecond spectroscopy on well-textured ͑110͒and ͑100͒-YBCO thin films, two distinctly temperature-dependent characteristics of quasiparticle relaxation in the nodal and antinodal directions are clearly identified. One temperature dependence associated with a high-energy gap has been observed along the ab diagonal for the whole hole-doping region and along the b axis except near optimal doping, while the other temperature dependence related to the opening of the superconducting gap appears along b axis regardless of the hole concentration. This spatial dichotomy between the nodal and antinodal quasiparticle dynamics and the evolution of gap symmetry with hole doping are discussed for enlightenment on the nature of the phase diagram of hole-doped cuprates. These strongly suggest that the two characteristics may have different physical origins and compete with each other.

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“…(001)-oriented YCaBCO thin films prepared by pulsed laser deposition were used in this study. The detailed growth conditions and structure-property characterizations of the films were reported elsewhere [1][2][3]. In addition, we used the encapsulated bulk annealing method [4] to manipulate the oxygen content of the YCaBCO films.…”

Section: Methodsmentioning

confidence: 99%

Ultrafast dynamics in oxygen-deficient Y_0.7Ca_0.3Ba₂Cu₃O_7-δsuperconductors

Luo¹,

Huang²,

Wu³

et al. 2009

J. Phys.: Conf. Ser.

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The transient reflectivity change (∆R/R) in oxygen-deficient Y0.7Ca0.3Ba2Cu3O 7−δ (YCaBCO) thin films have been systematically measured at various temperatures by femtosecond spectroscopy. The magnitude change of ∆R/R from normal state to superconducting state were clearly observed in YCaBCO with various oxygen deficient, e.g. from overdoped region over optimaldoped region to underdoped region. Additionally, the carrier-phonon coupling strength was also characterized by the relaxation time of ∆R/R at various temperatures and hole concentration.

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Untitled

Cited by 8 publications

References 6 publications

Dominant Effect of Oxygen Enhancement on the Crystalline Orientation of YBa₂Cu₃O_x Film Prepared by Liquid-Phase Epitaxial Growth

Dominant Effect of Oxygen Enhancement on the Crystalline Orientation of YBa₂Cu₃O_x Film Prepared by Liquid-Phase Epitaxial Growth

Spatial dichotomy of quasiparticle dynamics in underdoped thin-filmYBa2Cu3O7−δsuperconductors

Ultrafast dynamics in oxygen-deficient Y_0.7Ca_0.3Ba₂Cu₃O_7-δsuperconductors

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Untitled

Cited by 8 publications

References 6 publications

Dominant Effect of Oxygen Enhancement on the Crystalline Orientation of YBa2Cu3Ox Film Prepared by Liquid-Phase Epitaxial Growth

Dominant Effect of Oxygen Enhancement on the Crystalline Orientation of YBa2Cu3Ox Film Prepared by Liquid-Phase Epitaxial Growth

Spatial dichotomy of quasiparticle dynamics in underdoped thin-filmYBa2Cu3O7−δsuperconductors

Ultrafast dynamics in oxygen-deficient Y0.7Ca0.3Ba2Cu3O7-δsuperconductors

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Dominant Effect of Oxygen Enhancement on the Crystalline Orientation of YBa₂Cu₃O_x Film Prepared by Liquid-Phase Epitaxial Growth

Dominant Effect of Oxygen Enhancement on the Crystalline Orientation of YBa₂Cu₃O_x Film Prepared by Liquid-Phase Epitaxial Growth

Ultrafast dynamics in oxygen-deficient Y_0.7Ca_0.3Ba₂Cu₃O_7-δsuperconductors