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Fluctuation conductivity and pseudogap in YBCO high-temperature superconductors (Review)
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10.1063/1.3081150
/content/aip/journal/ltp/35/3/10.1063/1.3081150
http://aip.metastore.ingenta.com/content/aip/journal/ltp/35/3/10.1063/1.3081150

Figures

Image of FIG. 1.
FIG. 1.

Schematic diagram of the splitting of orbitals of and of the spectral dependence of the density of states of YBCO for different degrees of doping: inadequate (a), optimal (b), and over-doped (c). The arrow mark the possible optical transitions: LHB and UHB—lower and upper Hubbard band, respectively.7

Image of FIG. 2.
FIG. 2.

Temperature dependences of the Hall coefficient and resistivity of systems with different oxygen concentration.121

Image of FIG. 3.
FIG. 3.

Temperature dependence of the Knight shift in classical superconductors (solid line) and in HTSCs (dashed line).120

Image of FIG. 4.
FIG. 4.

Phase diagram of HTSCs: crosses the curve and becomes equal to zero in the region of the superconducting phase (a); the dependence follows , and both dependences vanish simultaneously (b).117

Image of FIG. 5.
FIG. 5.

Temperature dependence of of a YBCO film with (sample F1, solid line). Dashed curve—the function .

Image of FIG. 6.
FIG. 6.

The function for different : 0.05 (1); 0.2 (2); 0.45 (3); 0.6 (4); 1 (5); 2 (6); 5 (7). For and the energies and , respectively, were used to make dimensionless.

Image of FIG. 7.
FIG. 7.

Evolution of the dependences S–c–N junctions with YBCO with increasing temperature , K: 4.2 (3), 45 (4), 71 (5) , 72 (6) . Curves 1 and 2 are the IVCs of the junction at (2) and (1) (a). Temperature dependence of the energy gap in YBCO (○). Temperature dependence of the second minimum observed at high energies (×). The solid lines show the BCS theory for and (b).

Image of FIG. 8.
FIG. 8.

of a S–c–N contact with YBCO (●) and classical S–c–N junction Ta–Cu (◼).167

Image of FIG. 9.
FIG. 9.

Evolution of the IVC of an S–c–N junction YBCO–Nb with microwave power increasing from (1) to (6). .

Image of FIG. 10.
FIG. 10.

Temperature dependences of (×), (●), and contact resistance (◼) normalized to their maximum values. ○—dependence of the resistance of a polycrystal.

Image of FIG. 11.
FIG. 11.

Temperature dependences of of the samples F1(1), F3 (2), F4 (3), and F6 (4). Inset: for sample F4 in zero magnetic field (1) and for (2).

Image of FIG. 12.
FIG. 12.

for sample F1 (●). The straight line is drawn for visual convenience.

Image of FIG. 13.
FIG. 13.

for sample F1 (◼) in comparison with the FC theories: 1—MT contribution ; 2—LD contribution; 3—AL contribution; 4—MT contribution .

Image of FIG. 14.
FIG. 14.

for sample F4 (●)in comparison with the FC theories: 1—MT contribution, ; 2—LD contribution; 3—AL contribution; 4—MT contribution, .

Image of FIG. 15.
FIG. 15.

Temperature dependence of the Hall voltage , YBCO films: ●—sample F1 , □—sample F3 .

Image of FIG. 16.
FIG. 16.

Function versus of YBCO films with different oxygen content (●); solid line—Eq. (3.6) with the parameters of sample F1. ○—function versus for the same samples.

Image of FIG. 17.
FIG. 17.

in the coordinates versus (solid curve 1) for sample F1 for temperatures from to in comparison with theory: curve 1—MT contribution; 2—AL contribution; 3—Eq. (4.2); 4—Eq. (4.4) (short dashed segment). Inset: versus (solid line); dashed line—extrapolation of the rectilinear section.

Image of FIG. 18.
FIG. 18.

in the coordinates versus (solid curve 1) for sample F6 for temperatures from to in comparison with theory: curve 1—MT contribution; 2—AL contribution; 3—Eq. (4.2); 4—Eq. (4.4) (short dashed segment). Inset: versus (solid line); dashed line—extrapolation of the rectilinear section.

Image of FIG. 19.
FIG. 19.

versus (curve 2) and versus (solid curve 1) for sample F6 in comparison with theory: curve 3—Eq. (4.3); 4—Eq. (4.4) (short dashed segment).

Image of FIG. 20.
FIG. 20.

for YBCO films with different oxygen concentration: ●—sample F1; □—F3; ◼—F4; ○—F6. The solid lines are drawn for visual convenience.

Image of FIG. 21.
FIG. 21.

versus for the same YBCO films as in Fig. 20: ○—sample F1,◼—F4, and —F6 and the dependences , calculated with Eq. (1.10) for different values of the parameter : 10 (1) (BCS limit), , , (BEC limit).

Tables

Generic image for table
Table I.

Resistive parameters of the samples.

Generic image for table
Table II.

Parameters of the analysis of the fluctuation conductivity of the samples.

Generic image for table
Table III.

Parameters of the analysis of the fluctuation conductivity of the samples.

Generic image for table
Table IV.

Parameters of the pseudogap analysis.

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/content/aip/journal/ltp/35/3/10.1063/1.3081150
2009-03-01
2014-04-19
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Fluctuation conductivity and pseudogap in YBCO high-temperature superconductors (Review)
http://aip.metastore.ingenta.com/content/aip/journal/ltp/35/3/10.1063/1.3081150
10.1063/1.3081150
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