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  • 1
    Electronic Resource
    Electronic Resource
    Electronic specific heat of Tl2Ba2CuO6+δ from 2 K to 300 K for 0≤δ≤0.1 (1994)
    Springer
    Journal of superconductivity 7 (1994), S. 261-264 
    Details
    ISSN: 1572-9605
    Keywords: Overdoped Tl2Ba2CuO6+δ ; electronic heat capacity ; resistivity ; pair breaking
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00730408
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Electronic specific heat of YBa2Cu3O6+x from 1.8 to 300 K (1994)
    Springer
    Journal of superconductivity 7 (1994), S. 243-249 
    Details
    ISSN: 1572-9605
    Keywords: Electronic specific heat ; superconductivity ; pseudogap ; Fermi statistics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract We have determined for the first time the electronic specific heatγ(x, T) of YBa2Cu3O6+x for 0.16≤x≤0.97 from 1.8 to 300 K. Weakly superconducting behavior betweenx=0.4 and 0.8 progresses rapidly to strong coupling BCS-like superconducting and metallic normal state behavior forx〉 0.9. However, the continuous development of the entropyS(x, T) withx andT across the entire series suggests a progressive modification of the low-energy spin spectrum with hole doping rather than a simple band model. Fermi statistics andk-space pairing for allx is indicated by the magnitude andT-dependence ofS(x, T). Pseudogap behavior inS(x, T) is observed over a temperature region aboveT c , which increases rapidly with oxygen depletion to around 200 K forx∼0.7. This loss of entropy reflects normal-state correlations apparently unrelated to the superconducting pairing.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00730405
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Electronic specific heat of overdoped Tl2Ba2CuO6+δ in a magnetic field (1996)
    Springer
    Journal of low temperature physics 105 (1996), S. 903-908 
    Details
    ISSN: 1573-7357
    Keywords: 74.25.Bt ; 74.72.Fq
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We have measured the magnetic field dependence of the electronic specific heat γel (=Cel/T) of polycrystalline Tl2Ba2CuO6+δ from 8 K to above Tc, for samples with Tc = 24 K to 72 K using a high resolution, differential technique. We find that in applied fields of up to 13 T the position of the specific heat jump does not shift significantly for any Tc. This is in strong disagreement with HC2(T) inferred from magnetoresistance experiments on the same compound, where the resistive transition is shifted down considerably by similar fields. However, there is a dramatic collapse of the specific heat anomaly height in field — signifying a loss in entropy around Tc — compensated by a corresponding increase in γel at lower temperatures. The superconducting anomaly is almost completely suppressed in 13 T for the lowest Tc sample, compared to a reduction of 65 % for the sample with Tc = 72 K. We find simple vertical scaling of γel(T) — γn suggesting that the field forces a proportion of the superconductor into the normal state, while the remainder in the superconducting state is unaffected.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00768497
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    Paper (German National Licenses)
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