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Hernández Martín, David ; Gallego Toledo, Fernando ; Tornos Castillo, Javier ; Rouco Gómez, Víctor ; Beltrán Finez, Juan Ignacio ; Munuera, C. ; Sánchez Manzano, David ; Cabero Piris, Mariona ; Cuéllar Jiménez, Fabián Andrés ; Arias Serna, Diego ; Sánchez Santolino, Gabriel ; Mompean, F. J. ; Gárcia Hernández, M. ; Rivera Calzada, Alberto Carlos ; Pennycook, S. J. ; Varela del Arco, María ; Muñoz, M. C. ; Sefrioui, Zouhair ; León Yebra, Carlos ; Santamaría Sánchez-Barriga, Jacobo | American Physical Society | 2020-12-30The persistence of ferroelectricity in ultrathin layers relies critically on screening or compensation of polarization charges which otherwise destabilize the ferroelectric state. At surfaces, charged defects play a crucial role in the screening[...]texto impreso
Peña, V. ; Sefrioui, Zouhair ; Arias Serna, Diego ; León Yebra, Carlos ; Santamaría Sánchez-Barriga, Jacobo ; Varela del Arco, María ; Pennycook, S. J. ; Martínez, J. L. | American Physical Society | 2004-06-08Here we examine the ferromagnetic/superconducting proximity effect in half-metallic ferromagnetic La_(0.7)Ca_(0.3)MnO_(3) and high-T_(c) superconducting YBa_(2)Cu_(3)O_(7) artificial structures. We have found experimental evidence for the coupli[...]texto impreso
Lucía Mulas, María Luisa ; Sánchez Quesada, Francisco ; Santamaría Sánchez-Barriga, Jacobo ; Sefrioui, Zouhair ; Arias Serna, Diego ; Loos, G. ; Navacerrada, M.A. | Amer Inst Physics | 2000-05-29We have studied the effect of He+ irradiation with doses in the range 10(12)-2x10(15) cm(-2) on two high-temperature superconducting structures: YBa2Cu3O7-x (YBCO) films and YBa2Cu3O7-x/PrBa2Cu3O7 (YBCO/PBCO) superlattices. In particular we have[...]texto impreso
Sefrioui, Zouhair ; Arias Serna, Diego ; Varela del Arco, María ; Villegas, J. E. ; López de la Torre, M. A. ; León Yebra, Carlos ; Loos, G. D. ; Santamaría Sánchez-Barriga, Jacobo | American Physical Society | 1999-12-01Current-voltage (I-V) characteristics were used to investigate the response of the vortex-glass (VG) phase transition in high-quality epitaxial YBa_(2)Cu_(3)O_(7-?) films in magnetic fields up to 7 T. We show that varying the oxygen content, the[...]texto impreso
Varela del Arco, María ; Arias Serna, Diego ; Sefrioui, Zouhair ; León Yebra, Carlos ; Ballesteros, C. ; Pennycook, S. J. ; Santamaría Sánchez-Barriga, Jacobo | American Physical Society | 2002-10-01We report the effects of epitaxial strain and deoxygenation on high quality [YBa_(2)Cu_(3)O_(7-x)(YBCO)_(N) /PrBa_(2)Cu_(3)O_(7)(PBCO)_(5)]_(1000 Å) superlattices, with 1texto impreso
Varela del Arco, María ; Grogger, W. ; Arias Serna, Diego ; Sefrioui, Zouhair ; León Yebra, Carlos ; Ballesteros, C. ; Frishnan, K.M. ; Santamaría Sánchez-Barriga, Jacobo | American Physical Society | 2001-05-28Charge neutrality and stoichiometry impose severe restrictions on the mechanisms of epitaxial growth of complex oxides. The fundamental question arises of what is the minimum growth unit when sample thickness is reduced beyond the size of the un[...]texto impreso
Nemes, Norbert Marcel ; Rocci, Mirko ; Sefrioui, Zouhair ; León Yebra, Carlos ; Santamaría Sánchez-Barriga, Jacobo | American Physical Society | 2010-03-01We report on the magnetic anisotropy controlled modulation of the superconductivity in La_(0.7)Ca_(0.3)MnO_(3)/YBa_(2)Cu_(3)O_(7??)/La_(0.7)Ca_(0.3)MnO_(3) ferromagnet/superconductor/ferromagnet hybrids with biaxial easy axes. The magnetoresista[...]texto impreso
Garcia Barriocanal, Javier ; Pérez Muñoz, Ana Mª ; Sefrioui, Zouhair ; Arias Serna, Diego ; Varela del Arco, María ; León Yebra, Carlos ; Pennycook, Stephen J. ; Santamaría Sánchez-Barriga, Jacobo | American Physical Society | 2013-06-11We examine the effect of interface disorder in suppressing superconductivity in coherently grown ultrathin YBa_(2)Cu_(3)O_(7) (YBCO) layers on SrTiO_(3) (STO) in YBCO/STO superlattices. The termination plane of the STO is TiO_(2) and the CuO cha[...]texto impreso
Varela del Arco, María ; Grogger, W. ; Arias Serna, Diego ; Sefrioui, Zouhair ; León Yebra, Carlos ; Vázquez, L. ; Ballesteros, C. ; Krishnan, K.M. ; Santamaría Sánchez-Barriga, Jacobo | American Physical Society | 2002-11-01We report on the growth mechanism of YBa_(2)Cu_(3)O_(7-x). Our study is based on an analysis of ultrathin YBa_(2)Cu_(3)O_(7-x) (YBCO) layers in c-axis-oriented YBa_(2)Cu_(3)O_(7-x)/PrBa_(2)Cu_(3)O_(7)superlattices. We have found that the release[...]texto impreso
Bruno, F. Y. ; Garcia Barriocanal, Javier ; Torija, M. ; Rivera Calzada, Alberto Carlos ; Sefrioui, Zouhair ; Leighton, C. ; León Yebra, Carlos ; Santamaría Sánchez-Barriga, Jacobo | American Institute of Physics | 2008-02-25Electrical transport properties of heteroepitaxial p-n junctions made of La_(0.8)Sr_(0.2)CoO_(3) and SrTi_(0.99)Nb_(0.01)O_(3) were studied. Junctions display highly rectifying current-voltage characteristics over a wide temperature range (20–30[...]texto impreso
López de la Torre, M. A. ; Sefrioui, Zouhair ; Arias Serna, Diego ; Varela del Arco, María ; Villegas, J. E. ; Ballesteros, C. ; León Yebra, Carlos | American Physical Society | 2001-01-05We report on the effect of light ion irradiation on the low-temperature electrical resistivity of ferromagnetic SrRuO_(3) thin films. Fresh samples displayed a ferromagnetic transition at T_(c)? 160 K, good metallic behavior (?(300 K)~400??cm, d[...]texto impreso
Liu, Yaohua ; Cuéllar Jiménez, Fabián Andrés ; Sefrioui, Zouhair ; Freeland, J. W. ; Fitzsimmons, M. R. ; León Yebra, Carlos ; Santamaría Sánchez-Barriga, Jacobo ; te Velthuis, S. G. E. | American Physical Society | 2013-12-11We report a strong effect of interface-induced magnetization on the transport properties of magnetic tunnel junctions consisting of ferromagnetic manganite La_(0.7)Ca_(0.3)MnO_(3) and insulating cuprate PrBa_(2)Cu_(3)O_(7). Contrary to the typic[...]texto impreso
Varela del Arco, María ; Arias Serna, Diego ; Sefrioui, Zouhair ; León Yebra, Carlos ; Ballesteros, C. ; Santamaría Sánchez-Barriga, Jacobo | American Physical Society | 2000-11-01The effects of epitaxial strain in ultrathin YBa_(2)Cu_(3)O_(7-?) layers have been investigated by x-ray diffraction and transmission electron microscopy. The samples used were high quality [YBa_(2)Cu_(3)O_(7-?)(YBCO)_(N)/PrBa_(2)Cu_(3)O_(7)(PBC[...]texto impreso
Sefrioui, Zouhair ; Arias Serna, Diego ; Morales, F. ; Varela del Arco, María ; León Yebra, Carlos ; Escudero, R. ; Santamaría Sánchez-Barriga, Jacobo | American Physical Society | 2001-01-01We report on transport and magnetic relaxation measurements of deoxygenated YBa_(2)Cu_(3)O_(7-?) thin films. Strongly oxygen depleted samples with ?=0.6 are produced to ensure the pure two-dimensional nature of the vortex system. Linear resistiv[...]texto impreso
Nemes, Norbert Marcel ; Visani, C. ; Sefrioui, Zouhair ; León Yebra, Carlos ; Santamaría Sánchez-Barriga, Jacobo ; Iglesias, M. ; Mompean, F. ; Gárcia Hernández, M. | American Physical Society | 2010-01We examine the interplay between ferromagnetism and superconductivity in bilayer and trilayer heterostructures based on Co, YBa_(2)Cu_(3)O_(7-?) (YBCO), and La_(0.7)Ca_(0.3)MnO_(3) (LCMO) thin films grown on SrTiO_(3) substrates with typical thi[...]
