ISSN:
1572-9605
Schlagwort(e):
Y1−x Pr x Ba2Cu3O7−δ
;
Y1−x M x Ba2Cu3O7−δ
;
Hall effect
;
magnetoresistance
Quelle:
Springer Online Journal Archives 1860-2000
Thema:
Elektrotechnik, Elektronik, Nachrichtentechnik
,
Physik
Notizen:
Abstract Investigations of Y1−x M x Ba2Cu3O7−δ (M=Ce, Th)c-axis oriented thin film specimens show that the rate of depression ofT c withx is larger for M=Th, than for M=Ce and Pr, and suggest that Ce, like Th, is tetravalent in this compound. Hall effect measurements on Y1−x Pr x Ba2Cu3O7−δ single crystals reveal aT 2 dependence of the cotangent of the Hall angle in the normal state and a “negative Hall anomaly” belowT c in the superconducting state, in agreement with recent reports. Our research shows that the depth, Δ, of the negative Hall signal scales withT/T c and that the maximum value of Δ decreases linearly withx and vanishes atx≈0.24. Magnetoresistance measurements on Y1−x Pr x Ba2Cu3O7−δ single crystals indicate that the irreversibility lineH(T *) obeys a universal scaling relation characterized by anm=3/2 power law nearT c, with a crossover to a more rapid temperature dependence of belowT/T c ≈0.6, similar to that observed for polycrystalline specimens.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1007/BF00730377
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