Upper critical field measurements in high-Tc superconducting oxides

Upper critical fields Bc2(T) near Tc have been measured for the samples of Ba2YCu3Ox and Ba2GdCu3Ox. The upper critical field slope (dBc2dT)Tc and the upper critical field Bc2(O) have been calculated by using the least squares filling of straight line and using WHH expression in dirty limit respectively. The results show that Bc2(O) can be reach 114T and 127T for the samples of Ba2YCu3Ox and Ba2GdCu3Ox respectively. It is observed that there is a upwards curvature near Tc in the curves of B(T) vs.T. The main reason might be a proximity type effect in which a small amount of high Tc materials is able to raise the effective Tc of the samples, However such an effect could be suppressed at high field.

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The intrinsic upper critical field of high-Tc superconductors

Physica C Superconductivity ◽

10.1016/s0921-4534(97)00923-4 ◽

1997 ◽

Vol 282-287 ◽

pp. 1557-1558 ◽

Cited By ~ 1

Author(s):

X.-J. Xu ◽

L. Fu ◽

Y.-H. Zhang

Keyword(s):

Critical Field ◽

Upper Critical Field ◽

High Tc Superconductors ◽

High Tc

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Upper critical field measurements on A15 NbGe superconducting films

Journal of Low Temperature Physics ◽

10.1007/bf00681838 ◽

1983 ◽

Vol 50 (1-2) ◽

pp. 33-56 ◽

Cited By ~ 13

Author(s):

R. E. Somekh ◽

C. -G. Cui ◽

J. E. Evetts

Keyword(s):

Critical Field ◽

Upper Critical Field ◽

Field Measurements ◽

Superconducting Films

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Upper Critical Field Measurements on a Single Crystal YBa2Cu3Oxup to 38 T

Japanese Journal of Applied Physics ◽

10.1143/jjap.26.l1892 ◽

1987 ◽

Vol 26 (Part 2, No. 11) ◽

pp. L1892-L1894 ◽

Cited By ~ 43

Author(s):

Toshiro Sakakibara ◽

Tsuneaki Goto ◽

Yasuhiro Iye ◽

Noboru Miura ◽

Hiroyuki Takeya ◽

...

Keyword(s):

Single Crystal ◽

Critical Field ◽

Upper Critical Field ◽

Field Measurements

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Upper Critical Field Measurements for RBa2Cu3O7 (R = Y,Eu.9Y.1,Sm)

Novel Superconductivity ◽

10.1007/978-1-4613-1937-5_78 ◽

1987 ◽

pp. 689-691

Author(s):

A. P. Ramirez ◽

B. Batlogg ◽

R. J. Cava ◽

L. Schneemeyer ◽

R. B. van Dover ◽

...

Keyword(s):

Critical Field ◽

Upper Critical Field ◽

Field Measurements

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RESISTIVE UPPER CRITICAL FIELD OF SUPERCONDUCTING SPIN-LADDER Sr14-xCaxCu24O41

International Journal of Modern Physics B ◽

10.1142/s0217979200004131 ◽

2000 ◽

Vol 14 (29n31) ◽

pp. 3617-3622 ◽

Cited By ~ 6

Author(s):

T. NAKANISHI ◽

N. MOTOYAMA ◽

H. MITAMURA ◽

N. TAKESHITA ◽

H. TAKAHASHI ◽

...

Keyword(s):

High Pressure ◽

Critical Field ◽

Pressure Range ◽

Upper Critical Field ◽

Anomalous Behavior ◽

Spin Ladder ◽

Two Dimensional ◽

High Pressure Cell ◽

Upward Curvature ◽

Superconducting Oxides

We report the resistive upper critical field Hc2(T) of the hole-doped two-leg ladder Sr 14-x Ca x Cu 24 O 41(x=12) single crystal, which becomes superconducting with Tc~5 K in a pressure range above ~3.0 GPa . Using a newly developed compact high-pressure cell, the magneto-transport measurements have been performed at temperatures down to ~140 mK under high pressure above 3.5 GPa. It is found that Hc2 (perpendicular to the ladder Cu 2 O 3 plane) increases anomalously as the temperature is decreased having an upward curvature and shows no saturation down to T/T c ~ 0.03. Also, its temperature dependence is found to resemble that of the high-Tc superconducting oxide Tl 2 Ba 2 CuO 6. This fact suggests that the anomalous behavior of Hc2 has a common origin between the ladders and the two-dimensional high-Tc superconducting oxides.

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