scholarly journals Three energy scales characterizing the competing pseudogap state, the incoherent, and the coherent superconducting state in high-Tccuprates

2011 ◽  
Vol 83 (10) ◽  
Author(s):  
Y. Okada ◽  
T. Kawaguchi ◽  
M. Ohkawa ◽  
K. Ishizaka ◽  
T. Takeuchi ◽  
...  
Keyword(s):  
Superconducting State ◽  
Pseudogap State

Theory on Pseudogap State and Superconducting State in Strong Coupling Superconductors

2000 ◽  
Vol 69 (7) ◽  
pp. 2240-2249 ◽  
Author(s):  
Takanobu Jujo ◽  
Youichi Yanase ◽  
Kosaku Yamada
Keyword(s):  
Strong Coupling ◽  
Superconducting State ◽  
Pseudogap State

scholarly journals Investigations of proximity-induced superconductivity in the topological insulator Bi2Te3 by microRaman spectroscopy

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
D. Kiphart ◽  
Y. Harkavyi ◽  
K. Balin ◽  
J. Szade ◽  
B. Mróz ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Charge Transport ◽  
Topological Insulator ◽  
Superconducting State ◽  
High Temperature Superconductor ◽  
Superconducting Gap ◽  
Pseudogap State ◽  
Hybrid Device ◽  
Higher Temperature ◽  
Microraman Spectroscopy

AbstractWe used the topological insulator (TI) Bi2Te3 and a high-temperature superconductor (HTSC) hybrid device for investigations of proximity-induced superconductivity (PS) in the TI. Application of the superconductor YBa2Cu3O7-δ (YBCO) enabled us to access higher temperature and energy scales for this phenomenon. The HTSC in the hybrid device exhibits emergence of a pseudogap state for T > Tc that converts into a superconducting state with a reduced gap for T < Tc. The conversion process has been reflected in Raman spectra collected from the TI. Complementary charge transport experiments revealed emergence of the proximity-induced superconducting gap in the TI and the reduced superconducting gap in the HTSC, but no signature of the pseudogap. This allowed us to conclude that Raman spectroscopy reveals formation of the pseudogap state but cannot distinguish the proximity-induced superconducting state in the TI from the superconducting state in the HTSC characterised by the reduced gap. Results of our experiments have shown that Raman spectroscopy is a complementary technique to classic charge transport experiments and is a powerful tool for investigation of the proximity-induced superconductivity in the Bi2Te3.

Unconventional energetics of the pseudogap state and superconducting state in high-Tccuprates

2001 ◽  
Vol 63 (13) ◽  
Author(s):  
D. N. Basov ◽  
C. C. Homes ◽  
E. J. Singley ◽  
M. Strongin ◽  
T. Timusk ◽  
...  
Keyword(s):  
Superconducting State ◽  
Pseudogap State

MAGNETIC FIELD AND IMPURITY EFFECTS IN PSEUDOGAP STATE OF CUPRATES

2002 ◽  
Vol 16 (20n22) ◽  
pp. 3133-3133
Author(s):  
A. V. BALATSKY
Keyword(s):  
Magnetic Field ◽  
Superconducting State ◽  
Density Wave ◽  
Resonance State ◽  
Wave Component ◽  
Impurity Effects ◽  
Impurity States ◽  
Pseudogap State ◽  
Out Of Plane ◽  
D Wave

Both impurities and magnetic field can be used as a tool to investigate the properties of superconducting state of cuprates. Recent STM tunneling experiments on impurity states in superconducting state provide a new set of results that can be compared with the expectations for d-wave pairing in cuprates. We will argue that impurities and magnetic field could be used to test the nature of the pseudogap state (PG). i) We will present the extension of the theory of impurity on the pseudogap regime. The impurity such as Zn or Ni, will generate resonance state in PG state on very general grounds. Single vs double impurity peak will appear depending on the superconducting vs non-superconducting origin of the PG. ii) For the particular proposal of the d- density wave PG (DDW) we found that out of plane magnetic field will induce complex, proportional to the field, id xy -wave density wave component. Physical properties of this, previously not considered, state will be discussed.

Observation by HVEM of the martensite transformation and the superconducting transition in Nb3Sn

1988 ◽  
Vol 46 ◽  
pp. 788-789
Author(s):  
M. A. Kirk ◽  
M. C. Baker ◽  
B. J. Kestel ◽  
H. W. Weber
Keyword(s):  
Thin Films ◽  
Low Temperature ◽  
Superconducting State ◽  
Martensite Transformation ◽  
Sputter Deposition ◽  
Diffusion Reaction ◽  
Solute Diffusion ◽  
Superconducting Transition ◽  
Twin Boundaries ◽  
Martensite Structure

It is well known that a number of compound superconductors with the A15 structure undergo a martensite transformation when cooled to the superconducting state. Nb3Sn is one of those compounds that transforms, at least partially, from a cubic to tetragonal structure near 43 K. To our knowledge this transformation in Nb3Sn has not been studied by TEM. In fact, the only low temperature TEM study of an A15 material, V3Si, was performed by Goringe and Valdre over 20 years ago. They found the martensite structure in some foil areas at temperatures between 11 and 29 K, accompanied by faults that consisted of coherent twin boundaries on {110} planes. In pursuing our studies of irradiation defects in superconductors, we are the first to observe by TEM a similar martensite structure in Nb3Sn.Samples of Nb3Sn suitable for TEM studies have been produced by both a liquid solute diffusion reaction and by sputter deposition of thin films.

scholarly journals Specific heat of Zn-dopedYBa2Cu3O6.95:Possible evidence for Kondo screening in the superconducting state

2000 ◽  
Vol 61 (5) ◽  
pp. 3604-3609 ◽  
Author(s):  
D. L. Sisson ◽  
S. G. Doettinger ◽  
A. Kapitulnik ◽  
R. Liang ◽  
D. A. Bonn ◽  
...  
Keyword(s):  
Specific Heat ◽  
Superconducting State ◽  
Kondo Screening

scholarly journals Chiral topological superconducting state with Chern number C = −2 in Pb3Bi/Ge(111)

2021 ◽  
Vol 103 (23) ◽  
Author(s):  
Shuwen Sun ◽  
Wei Qin ◽  
Leiqiang Li ◽  
Zhenyu Zhang
Keyword(s):  
Superconducting State ◽  
Chern Number
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