Littérature scientifique sur le sujet « Supraconducteur désordonné »
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Thèses sur le sujet "Supraconducteur désordonné"
AKAABOUNE, NOR-EDDINE. « Diagramme de phase (H,T) du supraconducteur organique (TMTSF)2ClO4 faiblement désordonné ». Phd thesis, Université Paris Sud - Paris XI, 2002. http://tel.archives-ouvertes.fr/tel-00002215.
Texte intégralAkaaboune, Nor-Eddine. « Diagramme de phase (H, T) du supraconducteur organique (TMTSF)2ClO4 faiblement désordonné ». Paris 11, 2002. https://tel.archives-ouvertes.fr/tel-00002215.
Texte intégralThe present thesis work, was focusing in particular, on the superconducting state of quasi one dimensional organic conductor (TMTSF)2ClO4. We have determined a new vortex phase diagram of this compound, by interlayer transport measurement, performed under magnetic field applied perpendicular to the layers. Starting from an analysis of the critical current and the superconducting fluctuations, we have demonstrated that the electronic structure of (TMTSF)2ClO4 is three dimensional in nature and the transport along the weakest conductivity axis (c-axis) is very coherent although the coupling is weak in this direction. In the mixed state, the pinning energy in the liquid phase shows a 1/H dependence which corresponds to the plastic bending of the flux line lattice. Finally, we have also studied the effect of the disorder introduced by different thermal cooling rates. Our results show strong modifications on the superconducting parameters
Marrache-Kikuchi, Claire. « Effets dimensionnels dans un système désordonné au voisinage de la Transition Supraconducteur-Isolant ». Habilitation à diriger des recherches, Université Paris Sud - Paris XI, 2014. http://tel.archives-ouvertes.fr/tel-00929767.
Texte intégralMarrache-Kikuchi, Claire. « Effets dimensionnels dans un système désordonné au voisinage des transitions métal-isolant et supraconducteur-isolant ». Phd thesis, Université Paris Sud - Paris XI, 2006. http://tel.archives-ouvertes.fr/tel-00325067.
Texte intégralMarrache-Kikuchi, Claire Akiko. « Effets dimensionnels dans un système désordonné au voisinage des transitions métal-isolant et supraconducteur-isolant ». Paris 11, 2006. https://tel.archives-ouvertes.fr/tel-00325067.
Texte intégralLow temperature transport in disordered conducting materials imply quantum interference, Coulomb repulsion, and superconducting fluctuations. Since 2D is the lower critical dimension for the existence of metallic and superconducting states, we have studied two quantum phase transitions – the Superconductor-to-Insulator Transition (SIT) and the Metal-to-Insulator Transition (MIT) – when the thickness of a disordered system – here a-NbSi – is lowered. The underlying problem is the transition between the different states and the conditions for a 2D metal to exist. We have studied the field and disorder-induced SIT. The principal characteristics we have observed (renormalization, role of the field orientation) are well explained by M. P. A. Fisher's theory. However, we do not find the critical exponents values and a universal resistance at the transition as predicted by this theory. Concerning the MIT, we have decreased the thickness of a metallic system to reach the dimension 2 and an insulating state. In both transitions, the passage to the insulating state clearly shows the existence of dissipative states at zero temperature that are not predicted by conventional theories. We propose an interpretation of all our results that implies the existence of a novel phase in 2D, a Bose Metal, between the superconducting and the metallic states. This new state has been predicted by recent theories. We trace the corresponding phase diagram for the model system NbSi with respect to concentration and film thickness
Crauste, Olivier. « Étude des transitions de phases quantiques supraconducteur -- isolant, métal -- isolant dans des matériaux amorphes désordonnés proches de la dimension 2 ». Phd thesis, Université Paris Sud - Paris XI, 2010. http://tel.archives-ouvertes.fr/tel-00579256.
Texte intégralCouëdo, François. « Transitions de phase quantiques dans les systèmes désordonnés de basse dimension ». Phd thesis, Université Paris Sud - Paris XI, 2014. http://tel.archives-ouvertes.fr/tel-00990782.
Texte intégralStanisavljević, Ognjen. « High kinetic inductance-based microwave photon detection ». Electronic Thesis or Diss., université Paris-Saclay, 2024. http://www.theses.fr/2024UPASP038.
Texte intégralSingle photon detectors at visible frequencies have been essential tools in many areas of quantum technology, such as quantum key distribution or quantum optics. However, realizing highly efficient continuous single microwave photon detectors remains challenging. In this thesis, we propose and implement a microwave photon detector based on a superconducting tunnel junction coupled to a microwave cavity. Incident photons at resonator frquency are absorbed by the junction via inelastic quasiparticle tunneling, resulting in measurable photo-assisted tunneling current. To increase the inealstic tunneling rate, the resonator is fabricated in granular aluminium, leading to the mode characteristic impedance on the order of quantum of resistance. By measuring the current due to higher order processes, we calibrate the detector and estimate the quantum efficiency to be 0.83 --- an order of magnitude higher than reported in literature for detectors based on photo-assisted tunneling. In addition to the photo-assisted current, the power emitted by the sample is measured, and it is shown that the same device could be utilized to effectively cool superconducting circuits. We discuss the compatibility of the implemented photon detector with charge counting techniques required for discerning individual electrons, such as RF-SETs. We realize an RF-SET using a high-impedance granular aluminum resonator, and show high photon absorption for suitable bias and gate voltages. Additionally, we measure the charge sensitivity of this device as low as 5e-5 e/sqrt(Hz). Thus, the experiments in this work show that combining a radio-frequency single-electron transistor with a high efficiency photon to electron converter based on inelastic tunneling could lead to a practical single microwave photon counter
Van, Der Beek Cornelis Jacominus. « Thermodynamique des vortex dans les supraconducteurs désordonnés ». Habilitation à diriger des recherches, Université Paris Sud - Paris XI, 2009. http://tel.archives-ouvertes.fr/tel-00483670.
Texte intégralDubouchet, Thomas. « Spectroscopie locale à basse température dans des systèmes supraconducteurs désordonnés ». Phd thesis, Grenoble, 2010. http://www.theses.fr/2010GRENY036.
Texte intégralThis thesis presents a study combining tunneling spectroscopy, point-contact Andreev spectroscopy and electronic transport on disordered superconducting indium oxide samples. Transport measurements reveal a diverging resistivity from room temperature shortcut by superconductivity at low temperature. This behavior shows that our samples are in the vicinity of the metal-insulator Anderson transition. Tunneling spectroscopy highlights a rather unusual superconducting state with a pseudogap regime above the critical temperature. It evolves at low temperature into an inhomogeneous system composed of both superconducting Cooper pairs and Cooper pairs without phase coherence, localized by the disorder. Comparison between different samples shows that incoherent Cooper pairs proliferate with increasing level of disorder, what indicates that superconductor-insulator transition in indium oxide is governed by the progressive localization of Cooper pairs. Besides, using our STM, we have continuously analyzed the local conductance between tunneling regime and contact regime. Andreev spectroscopy thus reveals a new energy scale related to the superconducting phase coherence and independent from spatial fluctuations of the density of states measured in tunneling regime. This shows that disorder induces a dichotomy between the pairing energy characterizing the binding of electrons into pairs and the coherence energy specific to macroscopic superconductivity