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Hydrostatic Pressure Effects on Superconductive Phase Transitions in Y 1-x Ca x Ba 2 Cu 3 O 7-? and Y(Ba 1-y La y ) 2 Cu 3 O 7-?
Pressure effects on the superconductive transitions of cation replaced YBa 2 Cu 3 O 7-? : Y 1- x Ca x Ba 2 Cu 3 O 7-? (0? x ?0.2) and Y(Ba 1- y La y ) 2 Cu 3 O 7-? (0? y ?0.15) were investigated. The electric resistivity was measured up to 2 GPa as a function of temperature. The d T c /d p decreases...
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| Published in: | Japanese Journal of Applied Physics 1993-11, Vol.32 (11R), p.4950 |
|---|---|
| Main Authors: | , |
| Format: | Article |
| Language: | English |
| Citations: | Items that cite this one |
| Online Access: | Get full text |
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| Summary: | Pressure effects on the superconductive transitions of cation replaced YBa
2
Cu
3
O
7-?
: Y
1-
x
Ca
x
Ba
2
Cu
3
O
7-?
(0?
x
?0.2) and Y(Ba
1-
y
La
y
)
2
Cu
3
O
7-?
(0?
y
?0.15) were investigated. The electric resistivity was measured up to 2 GPa as a function of temperature. The d
T
c
/d
p
decreases with increasing
y
for Y(Ba
1-
y
La
y
)
2
Cu
3
O
7-?
, giving 1.0 K/GPa for YBa
2
Cu
3
O
7-?
and 2.9 K/GPa for Y(Ba
0.85
La
0.15
)
2
Cu
3
O
7-?
. For La replacement, the oxygen content was almost unchanged. Therefore, the replacement of Y by La led to electron doping. The pressure derivative of
T
c
indicates that the pressure induces hole doping whose effect is increased with the increase of La contant. Contrary to our expectation, Y
1-
x
Ca
x
Ba
2
Cu
3
O
7-?
was not hole-doped but electron-doped because of the increase in the oxygen deficiency with Ca content. However the d
T
c
/d
p
is almost independent of
x
. |
|---|---|
| ISSN: | 0021-4922 1347-4065 |
| DOI: | 10.1143/JJAP.32.4950 |