Sökning: "Cuprates"

Visar resultat 6 - 10 av 26 avhandlingar innehållade ordet Cuprates.

1. 6. Crystallization of the superconducting phase in unconventional superconductors

   Författare :Patric Holmvall; Chalmers tekniska högskola; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; pattern formation; spontaneous symmetry breaking; Andreev bound states; mesoscopic superconductivity; phase crystals; thin superconducting films; phase transitions; non-local Ginzburg-Landau theory; time-reversal symmetry; flat bands; unconventional superconductivity; quasiclassical theory; translational symmetry; cuprates; inhomogeneous superconductivity;

   Sammanfattning : Superconductivity is a macroscopic quantum phenomenon, in the sense that a macroscopic number of electrons form a pair condensate, that occupies a single ground state. The electrons in this state are phase-coherent, breaking global U (1)-symmetry, and spatial variations of the phase imply superflows that usually cost kinetic energy, resulting in a uniform and rigid phase. LÄS MER

3. 7. High-frequency phenomena in small Bi2Sr2CaCu2O8+x intrinsic Josephson junctions

   Författare :Holger Motzkau; Vladimir M. Krasnov; Reinhold Kleiner; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; high-temperature superconductivity; Bi-2212; cuprates; intrinsic Josephson junctions; intrinsic tunneling; fluxons; flux-flow oscillator; THz-emission; cavity resonances; polaritons; electrical doping; micro nano-fabrication; fysik; Physics;

   Sammanfattning : In this thesis, the tunneling between individual atomic layers in structures of Bi2Sr2CaCu2O8+x based high-temperature superconductors are experimentally studied employing the intrinsic Josephson effect. A special attention is paid to the fabrication of small mesa structures using micro and nanofabrication techniques. LÄS MER

4. 8. d-wave pairing in cuprate superconductors

   Författare :Fabian Wenger; Chalmers tekniska högskola; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; d-wave pairing; superconductors; high-T_{c< sub>}; cuprates;

   Sammanfattning : .... LÄS MER

5. 9. Photoelectron Spectroscopy of Cuprates and Manganites

   Författare :Mats Leandersson; Lunds universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; HTSC; photoelectron spectroscopy; angle resolved photoemission; magnetoresistance; superconductivity; magnetic resonance; relaxation; spectroscopy; Kondenserade materiens egenskaper:elektronstruktur; magnetiska och optiska ; egenskaper elektriska; supraledare; magnetisk resonans; Physics; spektroskopi; resonant photoemission; Condensed matter:electronic structure; CMR; electrical; supraconductors; magnetic and optical properties; Fysik; Fysicumarkivet A:2000; Leandersson;

   Sammanfattning : Abstract In this thesis, the high temperature superconductors (HTSC) La2CuO4+x and Bi2Sr2CaCu2O8+d and the colossal magnetoresistive (CMR) La1-xSrxMnO3 have been studied by photoelectron spectroscopy. Techniques such as angular resolved photoemission (ARPES), resonant photoemission spectroscopy (RESPES) and x-ray absorption spectroscopy have been applied, using synchrotron radiation. LÄS MER

7. 10. The use of lithium [11C]methyl(2-thienyl)cuprates in labeling synthesis

   Författare :Henrik Neu; Uppsala universitet; []
   Nyckelord :NATURAL SCIENCES; NATURVETENSKAP;

   Sammanfattning : .... LÄS MER