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Anomalous magnetoresistance in the normal state of Y1−xPrxBa2Cu3Oy (x≥0.6) films

✍ Scribed by H. Iwasaki; S. Kenmochi; O. Taniguchi; N. Kobayashi

Publisher
Elsevier Science
Year
1993
Tongue
English
Weight
519 KB
Volume
204
Category
Article
ISSN
0921-4534

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✦ Synopsis

The magnetoresistance was measured for both Hllc-axis and HIc-axis, using c-axis oriented films with ~20.6 of the Y, _,Pr,Ba&u,O, system. The sheet resistance for the CuO, layer of the sample with X= 0.6 is in agreement with h/4e2= 6400 Q/II which is the threshold value of a superconducting-insulator (S-I) transition in the two-dimensional system. Furthermore. in the samples with x=0.6 and 0.7 a negative magnetoresistance was observed in a wide temperature range below 50 K. Its magnitude is much larger for Hllc-axis than for HIc-axis.

The origin of the negative magnetoresistance is interpreted as a localization effect because those samples have the Pr concentration around the S-I transition in the present system. It is pointed out that the disappearance of the superconductivity at x,,-0.55 originates from the localization effect by Pr doping.

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✍ H. Iwasaki; O. Tanigichi; S. Kenmochi; N. Kobayashi 📂 Article 📅 1994 🏛 Elsevier Science 🌐 English ⚖ 146 KB

Electrical resistivity of Yl\_xPr:~Ba2Cu309with x=0.45 has been measured around the superconducting transition temperature in applied magnetic fields. The superconducting transition becomes once broad above 1T and then narrowing of the transition appears in higher magnetic field above 9T for HIIc-ax