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Dive into the research topics where M. P. Rojas Sarmiento is active.

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Featured researches published by M. P. Rojas Sarmiento.


Brazilian Journal of Physics | 2006

Pairing and coherence transition in La1.82Sr0.18CuO4 strongly two-dimensional superconductor

J. Roa-Rojas; D.A. Landínez Téllez; M. P. Rojas Sarmiento

We report conductivity fluctuation measurements in the La1.82Sr0.18CuO4 high temperature superconducting material. The conductivity fluctuation analysis was performed by utilizing the concept of the logarithmic derivative of the conductivity excess. Close and above the critical temperature Tc, we experimentally determine the occurrence of Gaussian and critical fluctuation regimes. Systematic measurements of conductivity as a function of temperature were performed for several values of transport current j. Fluctuation analysis close to the zero resistivity temperature Tc0 was performed and we clearly identified a characteristic exponent, which is analyzed by the dynamical scaling theory and considering a percolation-like transition in a frustrated and disordered system. The observation of a glass-like behavior in our experiments permits to interpret our results as corresponding to a vortex-glass regime.


Physica B-condensed Matter | 2007

Conductivity fluctuation and superconducting parameters of the YBa2Cu3−x(PO4)xO7–δ material

M. P. Rojas Sarmiento; M.A. Uribe Laverde; E. Vera López; D.A. Landínez Téllez; J. Roa-Rojas


Physica Status Solidi (c) | 2007

Conductivity fluctuation in the high temperature superconductor with planar weight disparity Y0.5Sm0.5Ba2Cu3O7−δ

E. W. Barrera; M. P. Rojas Sarmiento; L. F. Rincón; D.A. Landínez Téllez; J. Roa-Rojas


Journal of Magnetism and Magnetic Materials | 2008

Effect of doping with magnetic 3D-elements on the thermal fluctuations and critical parameters of CaLaBaCu3−x(Ni,Co)xO7−δ superconductors

M. P. Rojas Sarmiento; D.A. Landínez Téllez; J. Roa-Rojas


Revista de la Sociedad Colombiana de Física | 2009

Determinación de los Parámetros Críticos del Compuesto Superconductor Y0.5Sm0.5Ba2Cu3O7.ä

M. P. Rojas Sarmiento; E. W. Barrera Bello; D.A. Landínez Téllez; Jairo Roa Rojas


Revista de la Sociedad Colombiana de Física | 2009

Análisis de la Transición de Coherencia del Superconductor en Ausencia de Campo Magnético

M. P. Rojas Sarmiento; E. W. Barrera Bello; D.A. Landínez Téllez; Jairo Roa Rojas


Revista de la Sociedad Colombiana de Física | 2009

Estudio de la contribución de fluctuaciones térmicas en la conductividad electrica del superconductor Yb0.6Sm0.4Ba2Cu3O7-Â

M. P. Rojas Sarmiento; E. W. Barrera Bello; Carlos Parra; D.A. Landínez Téllez; Jairo Roa Rojas


Archive | 2009

Determinación de los Parámetros Críticos del Compuesto Superconductor Y 0.5 Sm 0.5 Ba 2 Cu 3 O 7−δ Determination of Critical Parameters of Compound Y0.5Sm0.5Ba2Cu3O7−δ Superconductor

M. P. Rojas Sarmiento; E. W. Barrera Bello; D.A. Landínez Téllez; J. Roa-Rojas


Archive | 2009

Análisis de la Transición de Coherencia del Superconductor RE 0.5 Y 0.5 Ba 2 Cu 3 O 7−δ (RE=Sm, Dy , Eu) en Ausencia de Campo Magnético Analysis of the Cherence of Superconducting Transition RE0.5Y0.5Ba2Cu3O7−δ (RE=Sm, Dy , Eu) in Absence Magnetic Field

M. P. Rojas Sarmiento; E. W. Barrera Bello; D.A. Landínez Téllez; J. Roa-Rojas


Archive | 2009

Estudio de la contribución de fluctuaciones térmicas en la conductividad eléctrica del superconductor Yb 0.6 Sm 0.4 Ba 2 Cu 3 O 7-δ Study of the contribution of thermal fluctuations in the electrical conductivity of superconductor Yb0.6Sm0.4Ba2Cu3O7-δ

M. P. Rojas Sarmiento; E. W. Barrera Bello; D.A. Landínez Téllez; J. Roa-Rojas

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J. Roa-Rojas

National University of Colombia

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Jairo Roa Rojas

National University of Colombia

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D.A. Landínez Téllez

National University of Colombia

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E. W. Barrera

National University of Colombia

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L. F. Rincón

National University of Colombia

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M.A. Uribe Laverde

National University of Colombia

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