Grupo de Fisica de Materiales Complejos

G. Bolaños, P. Prieto, D. Arias, Z. Sefrioui y J. Santamaría, "Effect of silver doping on the transport properties of epitaxial YBa2Cu3O7 thin films", Physica C 341-348, 1197 (2000).

M. C. Cyrille, S. Kim, M. E. Gómez, J. Santamaría, C. Leighton, K. M. Krishnan, and I. K. Schuller , "Effect of the sputtering pressure induced roughness on the microstructure and the perpendicular giant magnetoresistance of Fe/Cr superlattices", Phys. Rev. B 62, 15079 (2000).

J. Ibarra, A. Várez, C. León, J. Santamaría, L.M. Torres-Martínez y J. Sanz, "Influence of composition on the structure and conductivity of the fast ionic conductors La2/3-xLi3xTiO3", Solid State Ionics 134, 219 (2000).

M. Varela, Z. Sefrioui , D. Arias, C. León, C. Ballesteros y J. Santamaría, "Epitaxial mismatch strain in YBa2Cu3O7 / PrBa2Cu3O7 superlattices", Phys. Rev. B 62, 12509 (2000).

M. Varela, D. Arias, Z. Sefrioui, C. León, C. Ballesteros y J. Santamaría, "Structure characterization of epitaxial strain relaxation in YBa2Cu3O7-x/ PrBa2Cu3O7 superlattices ", Mat. Res. Soc. Proc. Symp. 619, 185 (2000).

M. C. Cyrille, S. Kim, M. E. Gómez, J. Santamaría, K. M. Krishnan, y I. K. Schuller , "Enhancement of perpendicular and parallel giant magnetoresistance with the number of bilayers in Fe/Cr superlattices" Phys. Rev. B 62, 3361 (2000).

M. A. Navacerrada, Z. Sefrioui, D. Arias, M. Varela, G. Loos, M. Lucía, J. Santamaría y F. Sánchez- Quesada. " Critical temperature depression and persistent photoconductivity in ion irradiated YBa2Cu3O7 films and YBa2Cu3O7 / PrBa2Cu3O7 superlattices" Appl. Phys. Lett. 76, 3289 (2000).

J. A. Alonso, J. Sanz, J. Santamaría, C. León, A. Várez y M. T. Fernández. "On the location of Li+ cations in the fast Li-cation conductor La0.5Li0.5TiO3 perovskite", Angew. Chem. Int. Ed. 39, 619 (2000).

M. A. París, J. Sanz, C. León, J. Santamaría, J. Ibarra y A. Várez, "Lithium mobility in the orthorrombic Li0.18La0.61TiO3 perovskite studied by NMR and Impedance Spectroscopies", Chem. Mater. 12, 1694 (2000).

Z Sefrioui, D Arias, M Varela, M A López de la Torre, G D Loos, C León y J Santamaría."Magnetic field induced change in the dimensionality of the vortex glass transition in YBa2Cu3O6.4 thin films", Inst. Phys. Conf. Ser. 167, 827 (2000).

D. Arias, Z.Sefrioui, M. Varela, G. Loos, C. León y J. Santamaría. "He+ irradiation and oxygen disorder in epitaxial YBa2Cu3O7-d thin films", Inst. Phys. Conf. Ser. 167, 815 (2000).

K. L. Ngai y C. León. "Recent advances in relating macroscopic electrical relaxation data to microscopic movements of the ions in ionically conducting materials", Solid State Ionics 125, 81 (1999).

M. Varela, Z. Sefrioui , D. Arias, M. A. Navacerrada, M. Lucía, M. A. López de la Torre, C. León, G. Loos, F. Sánchez-Quesada, y J. Santamaría, "Intracell changes in epitaxially strained YBa2Cu3O7-x ultrathin layers in YBa2Cu3O7-x/ PrBa2Cu3O7 superlattices", Phys. Rev. Lett. 83, 3936 (1999).

Z. Sefrioui , D. Arias, M. Varela, J. E. Villegas, M. A. López de la Torre, C. León, G. Loos y J. Santamaría, "Crossover from 3D to pure 2D vortex-glass transition in deoxygenated YBa2Cu3O7-x thin films", Phys. Rev. B 60, 15423 (1999).

M. N. Blanco, E. Redondo, C. León, J. Santamaría y G. González-Díaz, "Electrical characterization of Si+ and Si+/P+ implanted N+P In0.53Ga0.47As junctions", J. Mater. Sci.: Mater. Electron. 10, 425 (1999).

C. León y K. L. Ngai. "Rapidity of the change of the Kohlrausch exponent of the a-relaxation of glass-forming liquids at TB or Tb and consequences", J. Phys. Chem. B 103, 4045 (1999).

K. L. Ngai y C. León. "Relating macroscopic electrical relaxation to microscopic movements of the ions in ionically conducting materials by theory and experiment", Phys. Rev. B 60, 9396 (1999).

C. León, K. L. Ngai y C. M. Roland. "Relationship between the primary and secondary dielectric relaxation processes in propylene glycol and poly(propylene glycols)", J. Chem. Phys. 110, 11585 (1999).

M. C. Blesa, E. Moran, C. León, J. Santamaría, J. D. Tornero y N. Menéndez, "a- NaFeO3: ionic conductivity and sodium extraction", Solid State Ionics 126, 81 (1999).

Z. Sefrioui, D. Arias, M. Varela, M. A. López de la Torre , C. León, G. D. Loos, y J. Santamaría, "Pure 2D vortex-glass phase transition with Tg = 0 in deoxygenated YBa2Cu3O6.4 thin films", Europhys. Lett. 48, 679 (1999).

A. Várez, J. Ibarra, A. Rivera, C. León, J. Santamaría, L.M. Torres-Martínez y J. Sanz, "Effect of composition and heat treatment on the structure of lithium ion conducting perovskites La2/3-xLi3xTiO3 (0.03<x<0.167)", Proceedings of the 8th International Scientific Conference on Achievements in Mechanical & Materials Engineering, 623 (1999).

J. A. Alonso, J. Ibarra, M. A. Paris, J. Sanz, J. Santamaria, C. Leon, A. Varez y M. T. Fernandez "Relationship between crystal structure and Li+ conductivity in Li0.5La0.5TiO3 Perovskite", MRS Proc. Symp. 575, 337 (1999).

E. M. González, M.E. Luna, Z. Sefrioui, J. Santamaría y J. L. Vicent, "Size effects on the critical scaling laws in a axis and c axis oriented 123 thin films" J. Low Temp. Phys. 117, 9 (1999).

Z. Sefrioui, M. A. López de la Torre, D. Arias, M. A. Navacerrada, M. Varela, M. L. Lucía, J. Santamaría y F. Sánchez- Quesada "Disorder and Damage Effects in SrRuO3 Thin Films" Physica B 259, 938 (1999).

M. N. Blanco, E. Redondo, C. León, J. Santamaría y G. González-Díaz, "Shallow junctions in p-In.53Ga.47As by ion implantation", Nucl. Inst. and Meth. B 147, 166 (1999).

A. K. Jonscher, C. León y J. Santamaría. "Dynamic transport in ionic conductors", J. Mater. Sci. 33, 4485 (1998).

M. A. Navacerrada, Z. Sefrioui, D. Arias, M. Varela, G. Loos, C. León, M. L. Lucía, J. Santamaría y F. Sánchez- Quesada. "Crecimiento Epitaxial de Superconductores de Alta Temperatura Crítica por Pulverización Catódica I: Películas Delgadas de YBCO" Rev. Española de Física 12(1), 10 (1998).

M. Varela, M. A. Navacerrada, D. Arias, Z. Sefrioui, G. Loos, C. León, M. L. Lucía, J. Santamaría y F. Sánchez- Quesada. "Crecimiento Epitaxial de Superconductores de Alta Temperatura Crítica por Pulverización Catódica II: Superredes YBCO/PBCO" Rev. Española de Física 12(2), 28 (1998).

Z. Sefrioui, D. Arias, M. A. Navacerrada, M. Varela, G. Loos, M. L. Lucía, J. Santamaría, F. Sánchez-Quesada y M. A. López de la Torre. "Metal-Insulator Transition in SrRuO3 induced by Ion Irradiation" Appl. Phys. Lett. 73, 3375 (1998).

C. Leon, M. L. Lucia, J. Santamaria y F. Sánchez-Quesada. "Universal scaling of the Conductivity Relaxation in crystalline ionic Conductors" Phys. Rev. B 57, 41 (1998).

A. Kuhn, C. Leon, F. Garcia Alvarado, J. Santamaria, E. Moran, y M. A. Alario Franco. "Study of the conductivity of Nax-dFexTi2-xO4 (x=0.875, 0<d<0.44)" , J. Solid State Chem. 137, 168 (1998).

C. León, J. Santamaría, M. A. París, J. Sanz, J. Ibarra y A. Várez. "Non Arrhenius Conductivity in the non Debye Li0.5La0.5TiO3 fast ionic Conductor ", Journal of non Crystalline Solids. 235-237, 753 (1998).

C. Leon, M. L. Lucia, y J. Santamaria. "Analytical distribution of relaxation times for the description of electrical conductivity relaxation in ionic conductors" Phil. Mag. B 75, 629 (1997).

C. León, J. Santamaría, M. A. París, J. Sanz, J. Ibarra y L. M. Torres. "Non Arrhenius Conductivity in Li0.5La0.5TiO3 fast ionic Conductor: reconciling Spin-Lattice and Electrical Conductivity Relaxation", Phys. Rev. B 56, 5302 (1997).

P. Melnikov, C. Leon, J. Santamaria, y F. Sanchez-Quesada "Lanthanum-Lithium-Sodium Double Chromates" , J. Alloys and Compounds 250, 2, (1997).

C. Leon, M. L. Lucia, y J. Santamaria "Correlated ion hopping in single crystal yttria stabilized zirconia", Phys. Rev. B 55, 882 (1997).

A. Hoffmann, T. Endo, J. Santamaria y I. K. Schuller "Persistent Photoconductiviyt spectrum of GdBa2Cu3O6.3 in the IR to UV region" Czechoslovak Journal of Physics 43, 1123 (1996).

C. León, J. M. Martín, J. Santamaría, J. Skarp, G. Gonzalez-Diaz, y F. Sanchez-Quesada. "The use of Kramers-Kronig transforms for the treatment of P-N junctions containig traps" J. Appl. Phys 79, 1 (1996).

M. L. Lucia, J. Santamaria, F. Sanchez-Quesada, W. Lopera, y P. Prieto. "Influence of the epitaxial properties in the mutual inductance response of high quality YBa2Cu3O7 thin films" Physica C 260, 149 (1996).

T. Endo, J. Santamaría, A. Hoffmann y I. K. Schuller. "Enhancement of Persistent Photoconductivity by UV excitation in GdBa2Cu3O6.3", Phys. Rev. B 54, R3750 (1996).

C. Leon, M. L. Lucia, J. Santamaria, M. A. Paris, J. Sanz, y A. Varez. "Electrical Conductivity Relaxation and Nuclear Magnetic Resonance of Li conducting Li0.5La0.5TiO3" Phys. Rev. B 54, 184 (1996)