Occurrence of superconductivity in diboride of Zr

2005 ◽  
Vol 426-431 ◽  
pp. 464-468 ◽  
Author(s):  
F.N. Islam ◽  
A.K.M.A. Islam
Keyword(s):  
Occurrence Of Superconductivity

The occurrence of superconductivity in sulfides, selenides, tellurides of Pt-group metals

1965 ◽  
Vol 26 (12) ◽  
pp. 2051-2057 ◽  
Author(s):  
Ch.J. Raub ◽  
V.B. Compton ◽  
T.H. Geballe ◽  
B.T. Matthias ◽  
J.P. Maita ◽  
...  
Keyword(s):  
Occurrence Of Superconductivity

scholarly journals Possible Occurrence of Superconductivity by the π-flux Dirac String Formation Due to Spin-Twisting Itinerant Motion of Electrons

Symmetry ◽  
2020 ◽  
Vol 12 (5) ◽  
pp. 776 ◽  
Author(s):  
Hiroyasu Koizumi
Keyword(s):  
Collective Mode ◽  
Orbit Interaction ◽  
Angular Variable ◽  
View Point ◽  
Electron Pairing ◽  
Conduction Electrons ◽  
Rashba Spin ◽  
Period 2 ◽  
Occurrence Of Superconductivity ◽  
String Formation

We show that the Rashba spin-orbit interaction causes spin-twisting itinerant motion of electrons in metals and realizes the quantized cyclotron orbits of conduction electrons without an external magnetic field. From the view point of the Berry connection, the cause of this quantization is the appearance of a non-trivial Berry connection A fic = − ℏ 2 e ∇ χ ( χ is an angular variable with period 2 π ) that generates π flux (in the units of ℏ = 1 , e = 1 , c = 1 ) inside the nodal singularities of the wave function (a “Dirac string”) along the centers of spin-twisting. Since it has been shown in our previous work that the collective mode of ∇ χ is stabilized by the electron-pairing and generates supercurrent, the π -flux Dirac string created by the spin-twisting itinerant motion will be stabilized by the electron-pairing and produce supercurrent.

Occurrence of superconductivity in yttrium dicarbide

1968 ◽  
Vol 14 (2) ◽  
pp. 247 ◽  
Author(s):  
A.L. Giorgi ◽  
E.G. Szklarz ◽  
M.C. Krupka ◽  
T.C. Wallace ◽  
N.H. Krikorian
Keyword(s):  
Occurrence Of Superconductivity

OCCURRENCE OF SUPERCONDUCTIVITY IN Ca-DOPED (Pb,Cu)Sr2PrCu2Oz

2005 ◽  
Vol 19 (01n03) ◽  
pp. 361-367
Author(s):  
H. K. LEE ◽  
Y. H. KIM ◽  
D. H. HA
Keyword(s):  
Magnetic Properties ◽  
Electrical Resistivity ◽  
Structural Changes ◽  
Hole Doping ◽  
Ca Doping ◽  
Bulk Ceramic ◽  
Electrical And Magnetic Properties ◽  
Ceramic Samples ◽  
Doping Effects ◽  
Occurrence Of Superconductivity

We have investigated the Ca -doping effects on the structural, electrical and magnetic properties of ( Pb 0.5 Cu 0.5) Sr 2( Pr 1-x Ca x Cu 2 O z( x =0-0.5) bulk ceramic samples. The electrical resistivity, thermoelectric power and magnetic susceptibility measurements reveal that the Ca doping introduces holes into the system and thereby superconductivity with onset T c, of about 36 K is induced for a phase with x =0.5. These results are discussed in conjunction with the roles of hole doping, structural changes and Pr - O hybridization in CuO 2 layers.

Palladium site ordering and the occurrence of superconductivity in Bi2Pd3Se2−xSx

2011 ◽  
Vol 184 (4) ◽  
pp. 797-804 ◽  
Author(s):  
R. Weihrich ◽  
S.F. Matar ◽  
I. Anusca ◽  
F. Pielnhofer ◽  
P. Peter ◽  
...  
Keyword(s):  
Occurrence Of Superconductivity

Occurrence of Superconductivity in Simple-Cubic(Au1−xPdx)Te2Alloys

1972 ◽  
Vol 5 (3) ◽  
pp. 901-903 ◽  
Author(s):  
Wilkie Y. K. Chen ◽  
C. C. Tsuei
Keyword(s):  
Simple Cubic ◽  
Occurrence Of Superconductivity

Composition of Superconducting La2CuO4+δ a Superconductor Doped by excess Oxygen Defects

1989 ◽  
Vol 156 ◽  
Author(s):  
B. Dabrowski ◽  
D. G. Hinks ◽  
J. D. Jorgensen ◽  
D. R. Richards
Keyword(s):  
Thermogravimetric Analysis ◽  
Metal Ion ◽  
Neutron Powder Diffraction ◽  
Excess Oxygen ◽  
Rich Phase ◽  
Resistivity Measurements ◽  
Oxygen Defects ◽  
Ion Substitution ◽  
Occurrence Of Superconductivity ◽  
Semiconducting Behavior

ABSTRACTWe have studied mixed-phase samples of bulk LazCuO4 using neutron powder diffraction, thermogravimetric analysis and resistivity measurements. Samples fired at 950°C and slowly cooled form in the K2NiF4 structure with CuO impurities for z<2 and La2O3 impurities for z>2. Neither La-vacancies nor stacking defects were found. The bulk resistivity of the samples show semiconducting behavior which is shorted at 38K by small amounts of superconducting material. The superconductivity is due to the presence of an oxygen-rich phase with stoichiometry La2CuO4.08. The occurrence of superconductivity in pure La2CuO4.08 with the same Tc as observed in the doped La1.85 Sr0.15CuO4 indicates that the excess oxygen provides the same level of doping as metal-ion substitution.

scholarly journals Superconductivity mediated by polar modes in ferroelectric metals

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
C. Enderlein ◽  
J. Ferreira de Oliveira ◽  
D. A. Tompsett ◽  
E. Baggio Saitovitch ◽  
S. S. Saxena ◽  
...  
Keyword(s):  
Critical Point ◽  
Energy Gap ◽  
Quantum Critical Point ◽  
Quantitative Model ◽  
Superconducting Transition ◽  
Pairing Interaction ◽  
Optimal Doping ◽  
Occurrence Of Superconductivity ◽  
Quantum Critical ◽  
Dynamical Screening

Abstract The occurrence of superconductivity in doped SrTiO3 at low carrier densities points to the presence of an unusually strong pairing interaction that has eluded understanding for several decades. We report experimental results showing the pressure dependence of the superconducting transition temperature, Tc, near to optimal doping that sheds light on the nature of this interaction. We find that Tc increases dramatically when the energy gap of the ferroelectric critical modes is suppressed, i.e., as the ferroelectric quantum critical point is approached in a way reminiscent to behaviour observed in magnetic counterparts. However, in contrast to the latter, the coupling of the carriers to the critical modes in ferroelectrics is predicted to be small. We present a quantitative model involving the dynamical screening of the Coulomb interaction and show that an enhancement of Tc near to a ferroelectric quantum critical point can arise due to the virtual exchange of longitudinal hybrid-polar-modes, even in the absence of a strong coupling to the transverse critical modes.

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