Electron Irradiation of YBa2Cu3O7 at low Temperatures

1987 ◽  
Vol 99 ◽  
Author(s):  
B. Stritzker ◽  
W. Zander ◽  
F. Dworschak ◽  
U. Poppe ◽  
K. Fischer
Keyword(s):  
Transition Temperature ◽  
Electron Irradiation ◽  
Normal State ◽  
Low Temperatures ◽  
Superconducting Transition Temperature ◽  
Superconducting Transition ◽  
Radiation Induced ◽  
State Resistance ◽  
Normal State Resistance

ABSTRACTBulk samples of YBa2Cu3O7−x have been homogenously irradiated with 3 MeV electrons at temperatures below 20 K. Whereas the superconducting transition temperature, Tc, drops dramatically with increasing dose the width of the transition remains unchanged (Δ Tc ≤ 1.5 K). The normal state resistance at 100 K increases substantially during the electron irradiation. Several irreproducible experiments can be interpreted with a radiation induced, unstable increase of Tc.

PRESSURE DEPENDENCE OF SUPERCONDUCTIVITY OF THE Tl-Ba-Ca-Cu OXIDE

1988 ◽  
Vol 02 (07) ◽  
pp. 879-883 ◽  
Author(s):  
J.L. ZHANG ◽  
C.G. CUI ◽  
S.L. LI ◽  
Y.L. ZHANG ◽  
X.R. CHENG ◽  
...  
Keyword(s):  
Fine Structure ◽  
Transition Temperature ◽  
Pressure Dependence ◽  
Normal State ◽  
Superconducting Transition Temperature ◽  
Superconducting Transition ◽  
State Resistance ◽  
Normal State Resistance

The pressure dependence of the superconductivity of the Tl-Ba-Ca-Cu-O sample with T c >110 K was studied. It is observed that the superconducting transition temperature increases at the rate of d T co / d P≈1.83 K/GPa up to 1.8K/GPa and the gentle steps of T c are always followed by a jump of the normal state resistance which is considered exhibiting the change of some fine structure related to the Cu-O planes.

scholarly journals Evolution of superconductivity and charge order in pressurized RbV3Sb5

2021 ◽  
Author(s):  
Feng Du ◽  
Shuaishuai Luo ◽  
Rui Li ◽  
Brenden R. Ortiz ◽  
Ye Chen ◽  
...  
Keyword(s):  
Normal State ◽  
Ambient Pressure ◽  
Charge Order ◽  
Superconducting Transition ◽  
Close Link ◽  
Pressure Medium ◽  
Similar Temperature ◽  
State Resistance ◽  
Pressure Phase ◽  
Normal State Resistance

Abstract The kagome metals AV3Sb5 (A = K, Rb, Cs) under ambient pressure exhibit an unusual charge order, from which superconductivity emerges. In this work, by applying hydrostatic pressure using a liquid pressure medium and carrying out electrical resistance measurements for RbV3Sb5, we find the charge order becomes suppressed under a modest pressure p c (1.4 < p c < 1.6 GPa), while the superconducting transition temperature T c is maximized. T c is then gradually weakened with further increase of pressure and reaches a minimum around 14.3 GPa, before exhibiting another maximum around 22.8 GPa, signifying the presence of a second superconducting dome. Distinct behaviors in the normal state resistance are found to be associated with the second superconducting dome, similar to KV3Sb5. Our findings point to qualitatively similar temperature-pressure phase diagrams in KV3Sb5 and RbV3Sb5, and suggest a close link between the second superconducting dome and the high-pressure normal state resistance.

HIGH PRESSURE STUDIES OF SUPERCONDUCTING Ba1−xKxBiO3

1990 ◽  
Vol 04 (14) ◽  
pp. 935-944 ◽  
Author(s):  
Z.J. HUANG ◽  
C.Y. HUANG ◽  
P.H. HOR ◽  
R.L. MENG ◽  
Y.Q. WANG ◽  
...  
Keyword(s):  
High Pressure ◽  
Transition Temperature ◽  
Pressure Effects ◽  
Superconducting Transition ◽  
High Current ◽  
Applied Current ◽  
High Pressure Studies ◽  
Sample Resistance ◽  
State Resistance ◽  
Normal State Resistance

We have studied the pressure effects of superconducting Ba 1−x K x BiO 3 for x=0.25, 0.30, 0.35 and 0.40 up to ~16 kbar . The superconducting transition temperature, Tc, increases linearly with pressure, P. We have found that dTc/dP decreases with increasing Tc, and reaches ~0 around Tc~29 K. For the x=0.35 sample, resistance reappears below Tc for pressure >12 kbar. This resistance depends strongly on the applied current. It becomes greater than the normal state resistance and noisy at high current.

THE OCCURRENCE OF SUPERCONDUCTIVITY IN THE Ho (Ba2−xSrx) Cu3O7−δ SYSTEM

1989 ◽  
Vol 03 (03) ◽  
pp. 225-227 ◽  
Author(s):  
M.F. TAI ◽  
J.R. HWANG ◽  
H.C. KU
Keyword(s):  
Electrical Resistivity ◽  
Transition Temperature ◽  
Phase Boundary ◽  
Normal State ◽  
Superconducting Transition Temperature ◽  
Systematic Variation ◽  
Superconducting Transition ◽  
Occurrence Of Superconductivity

Electrical, magnetic and crystallographic measurements have been carried out for the pseudoquaternary Ho ( Ba 2−x Sr x) Cu 3 O 7−δ system in order to check the systematic variation of superconducting transition temperature T c , normal state electrical resistivity and phase boundary. T c decreases monotonically with the increasing Sr substitution and drops sharply to zero for x≥1.6. No resisitivity anomaly was observed.

TRANSPORT PROPERTIES OF La2-x1Srx1CuO4+δ/La2-x2Srx2CuO4+δ MULTILAYERS GROWN BY LASER ABLATION

2013 ◽  
Vol 27 (15) ◽  
pp. 1362029
Author(s):  
H. F. WANG ◽  
Y. Z. ZHANG ◽  
L. H. LIU ◽  
D. P. LI ◽  
G. Y. WANG ◽  
...  
Keyword(s):  
Transition Temperature ◽  
Laser Ablation ◽  
Transport Properties ◽  
Low Temperatures ◽  
Superconducting Transition Temperature ◽  
Dominant Factor ◽  
Deposition Condition ◽  
Superconducting Transition ◽  
Charge Redistribution ◽  
Transport Measurements

A series of La 2-x1 Sr x1 CuO 4+δ/ La 2-x2 Sr x2 CuO 4+δ multilayers were epitaxially grown on (001) LaSrAlO 4 and (001) SrTiO 3 substrates by laser ablation, where x1 = 0.0, 0.08 (underdoped) and x2 = 0.24, 0.32, 0.45 (over-doped). Before the depositions of each multilayer, all of the single layers were deposited and characterized, and then the multilayers were deposited by using the same deposition condition except shifting targets for laser ablation. These multilayers are highly c-axis oriented. Several modulation wavelengths of the sublayers were selected for preparing the multilayers. The resistance measurements of these single layered films of La 2-x1 Sr x1 CuO 4+δ, La 2-x2 Sr x2 CuO 4+δ, and multilayers of La 2-x1 Sr x1 CuO 4+δ/ La 2-x2 Sr x2 CuO 4+δ were performed and compared. The transport measurements suggest that the charge redistribution may be a dominant factor for the superconducting transition temperature in low temperatures.

Evidence for d-Electron Localization in YBa2(Cu1−xZnx)3O7 for 0

1987 ◽  
Vol 99 ◽  
Author(s):  
C. Jee ◽  
D. Nichols ◽  
J. Ciasullo ◽  
J. E. Crow ◽  
T. Mihalisin ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Transition Temperature ◽  
Normal State ◽  
Superconducting Transition Temperature ◽  
Critical Value ◽  
Internal Magnetic Field ◽  
Electron Localization ◽  
Superconducting Transition ◽  
Zn Substitution ◽  
Zn Concentration

ABSTRACTZn substitution for Cu in YBa2Cu3O7 rapidly reduces the superconducting transition temperature, Tc. Superconductivity is quenched between x=0.08 (T =30 K) and x=0.10. The normal state paramagnetism grows with Zn substu-tition, presumably due to increased localization on the Cu sublattice. Susceptibility studies of oxygen depleted (nonsuperconducting) Zn-substituted samples support this. Strong non-linear isothermal magnetization suggesting an internal magnetic field is found at T=4.2 K in samples with Zn concentration near to the critical value for suppression of superconductivity. The results are discussed in terms of increased localization of d-electrons on the Cu sites with increasing Zn concentration, which is consistent with recent EPR data.

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