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Papers by Piero Martinoli
Superconducting Superlattices and Multilayers, 1994
ABSTRACT
Superconducting and Related Oxides: Physics and Nanoengineering III, 1998
The complex ac sheet impedance of c-axis oriented YBa2Cu3O7 thin films was measured as a function... more The complex ac sheet impedance of c-axis oriented YBa2Cu3O7 thin films was measured as a function of temperature in the frequency range 102Hz - 105 Hz for film thicknesses varying between 24 Angstrom and 1100 Angstrom. We present the measurements on the thinnest films and examine their consistency with the predictions from various models for the superconducting transition, in particular
Oxide Superconductor Physics and Nano-Engineering, 1994
Physica C: Superconductivity, 1994
ABSTRACT
Physical Review B, 1978
... No evidence of this boundary scattering has been found in this experiment, pCd being in-depen... more ... No evidence of this boundary scattering has been found in this experiment, pCd being in-dependent of dCd. ... TCB-T = cconst(ds + b) -2 A plot of ds vs (TcB-TC) -1/2 gives a reasonably straight line with an extrapolation length of 12 600 A' and TCB= 7.165 as shown in Fig. ...
Lecture Notes in Physics, 1987
Superconducting and Related Oxides: Physics and Nanoengineering III, 1998
In the field of high-temperature superconductivity there has been no increase in the critical tem... more In the field of high-temperature superconductivity there has been no increase in the critical temperature Tc of bulk compounds since 1993. However, an analysis of the uniaxial strain or pressure derivatives of Tc in the cuprate superconductors allows us to predict that under a compressive epitaxial strain, a large increase of Tc should be possible. We demonstrate the experimental feasibility
Physical Review B, 1978
A model is developed which describes the static and dynamic interaction of the vortex lattice wit... more A model is developed which describes the static and dynamic interaction of the vortex lattice with the pinning potential due to harmonic one-dimensional variations of the thickness of superconducting films. Using a London-Pearl approach, an expression is derived for the free energy of the mixed state in thin modulated films from which static equilibrium configurations of the vortex lattice and the corresponding deformations due to the harmonic pininng force are deduced. Lattice configurations of lowest energy are found when the magnetic induction B corresponds to matching of the (undistorted) triangular vortex lattice to the periodic pinning structure. Particular attention is devoted to lattice configurations slightly deviating from a matching situation. The flux-flow regime is also investigated when steady-state vortex motion results from the equilibrium of the Lorentz driving force, the viscous damping force, the harmonic pinning force and the pinning-induced lattice restoring force. A highly coherent flux-flow regime with rf properties similar to those of series arrays of resistively shunted Josephson junctions acting in phase and frequency coherence (super-radiant state) is found in the dynamic matching state. For nonmatching configurations we study the influence of dynamically excited lattice deformation modes on the current-voltage characteristics when vortex motion is driven bymore » dc or by superimposed dc and rf transport currents. In particular, for nearly matching configurations the width of the rf-induced interference transitions is related to the shear modulus of the vortex lattice and to the flux-flow resistivity.« less
Physik der Kondensierten Materie, 1973
Superconducting Superlattices and Multilayers, 1994
ABSTRACT
Superconducting and Related Oxides: Physics and Nanoengineering III, 1998
The complex ac sheet impedance of c-axis oriented YBa2Cu3O7 thin films was measured as a function... more The complex ac sheet impedance of c-axis oriented YBa2Cu3O7 thin films was measured as a function of temperature in the frequency range 102Hz - 105 Hz for film thicknesses varying between 24 Angstrom and 1100 Angstrom. We present the measurements on the thinnest films and examine their consistency with the predictions from various models for the superconducting transition, in particular
Oxide Superconductor Physics and Nano-Engineering, 1994
Physica C: Superconductivity, 1994
ABSTRACT
Physical Review B, 1978
... No evidence of this boundary scattering has been found in this experiment, pCd being in-depen... more ... No evidence of this boundary scattering has been found in this experiment, pCd being in-dependent of dCd. ... TCB-T = cconst(ds + b) -2 A plot of ds vs (TcB-TC) -1/2 gives a reasonably straight line with an extrapolation length of 12 600 A' and TCB= 7.165 as shown in Fig. ...
Lecture Notes in Physics, 1987
Superconducting and Related Oxides: Physics and Nanoengineering III, 1998
In the field of high-temperature superconductivity there has been no increase in the critical tem... more In the field of high-temperature superconductivity there has been no increase in the critical temperature Tc of bulk compounds since 1993. However, an analysis of the uniaxial strain or pressure derivatives of Tc in the cuprate superconductors allows us to predict that under a compressive epitaxial strain, a large increase of Tc should be possible. We demonstrate the experimental feasibility
Physical Review B, 1978
A model is developed which describes the static and dynamic interaction of the vortex lattice wit... more A model is developed which describes the static and dynamic interaction of the vortex lattice with the pinning potential due to harmonic one-dimensional variations of the thickness of superconducting films. Using a London-Pearl approach, an expression is derived for the free energy of the mixed state in thin modulated films from which static equilibrium configurations of the vortex lattice and the corresponding deformations due to the harmonic pininng force are deduced. Lattice configurations of lowest energy are found when the magnetic induction B corresponds to matching of the (undistorted) triangular vortex lattice to the periodic pinning structure. Particular attention is devoted to lattice configurations slightly deviating from a matching situation. The flux-flow regime is also investigated when steady-state vortex motion results from the equilibrium of the Lorentz driving force, the viscous damping force, the harmonic pinning force and the pinning-induced lattice restoring force. A highly coherent flux-flow regime with rf properties similar to those of series arrays of resistively shunted Josephson junctions acting in phase and frequency coherence (super-radiant state) is found in the dynamic matching state. For nonmatching configurations we study the influence of dynamically excited lattice deformation modes on the current-voltage characteristics when vortex motion is driven bymore » dc or by superimposed dc and rf transport currents. In particular, for nearly matching configurations the width of the rf-induced interference transitions is related to the shear modulus of the vortex lattice and to the flux-flow resistivity.« less
Physik der Kondensierten Materie, 1973