ISSN:
1572-9605
Schlagwort(e):
Overdoped Tl2Ba2CuO6+δ
;
electronic heat capacity
;
resistivity
;
pair breaking
Quelle:
Springer Online Journal Archives 1860-2000
Thema:
Elektrotechnik, Elektronik, Nachrichtentechnik
,
Physik
Notizen:
Abstract Using a high-precision differential technique with a resolution of 1∶104, we have measured the heat capacity of Tl2Ba2CuO6+δ over a temperature range 2–300 K for 0≤δ≤0.1. Anomalies atT c are seen for all superconducting compositions measured, and the results are consistent with a temperature- andδ-independent normal-state electronic termγ n∼0.6 mJ/g-at. K2. The samples with the largerT c 's exhibit strong fluctuations in their specific heat, typical of a highly anisotropic 2D superconductor, but there is some evidence that these fluctuations become weaker atT c falls-consistent with an increase in the coherence length on hole doping. At temperatures below 5 K an upturn in the data is observed which appears to increase in magnitude asT c falls, correlating with the increase in the Curie term of published susceptibility data.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1007/BF00730408
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