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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