Sökning: "YBCO single crystals"

Visar resultat 1 - 5 av 7 avhandlingar innehållade orden YBCO single crystals.

1. 1. Resistivity and the solid-to-liquid transition in high-temperature superconductors

   Författare :Beatriz Espinosa Arronte; Magnus Andersson; Charles Simon; KTH; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; high-temperature superconductors; vortex dynamics; vortex solid-to-liquid transition; critical scaling; glass transition; Bose glass; heavy-ion irradiation; YBCO; Tl2Ba2CaCu2O8 d; oxygen deficiency.; Condensed matter physics; Kondenserade materiens fysik;

   Sammanfattning : In high-temperature superconductors a large region of the magnetic phase diagram is occupied by a vortex phase that displays a number of exciting phenomena. At low temperatures, vortices form a truly superconducting solid phase which at high temperatures turns into a dissipative vortex liquid. LÄS MER

3. 2. On the Zero and Low Field Vortex Dynamics : An Experimental Study of Type-II Superconductors

   Författare :Örjan Festin; Peter Svedlindh; Piero Martinoli; Uppsala universitet; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Engineering physics; high temperature superconductors; thermal fluctuations; YBCO; MgB2; anisotropic superconductors; vortex dynamics; Kosterlitz-Thouless transition; current voltage characteristics; complex conductivity; Flux noise; Teknisk fysik; Engineering physics; Teknisk fysik;

   Sammanfattning : Dynamic properties of type-II superconductors have been experimentally studied in zero and low magnetic fields using SQUID magnetometry and I–V measurements.In zero magnetic field close to the critical temperature, the physical properties of type-II superconductors are dominated by spontaneously created vortices. LÄS MER

4. 3. Reshaping the phase diagram of YBa2Cu3O7-δ through strain in ultrathin films and nanowires

   Författare :Eric Wahlberg; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; phase-slip; strange metal; High-Tc superconductors; thin-films; underdoped; nanowires; YBCO; charge density wave;

   Sammanfattning : This thesis aims at adding important pieces to the puzzle of understanding the physics of the High critical Temperature Superconductor (HTS) cuprates, where despite over 30 years of intense research many open questions remain. The HTS cuprates are characterized by an incredibly complex phase diagram with multiple intertwined local orders, such as charge density waves (CDW). LÄS MER

5. 4. Resistive studies of vortices and fluctuations in single crystal YBa2Cu3O7-

   Författare :Therese Björnängen; KTH; []
   Nyckelord :condensed matter physics; high temperature superconductors; YB2Cu3O7-d; untwinned YBCO; oxygen deficiency; superconducting fluctuations; magnetoconductivity; in-plane anisotropy; vortex liquid; vortex solid; vortex correlation;

   Sammanfattning : High-temperature superconductors have been intensely studiedsince the discovery, almost 20 years ago. Their layeredstructure, extreme type-II behavior, large anisotropy, andstrong fluctuations have led to a large number of new andinteresting problems. LÄS MER

7. 5. Experimental Studies of the Vortex Solid-to-Liquid Transition and Disorder in High-Temperature Superconductors

   Författare :Björn Lundqvist; KTH; []
   Nyckelord :high-temperature superconductors; vortex dynamics; vortex solid-to-liquid transition; B c; B ab; anisotropy; YBCO single crystals; oxygen deficiency; Tl-2212; Tl-2201; charge neutral doping; disorder effects;

   Sammanfattning : .... LÄS MER