CONSTRAINTS ON THE TEMPERATURE-DEPENDENCE OF THE MAGNETIC PENETRATION DEPTH OF SUPERCONDUCTING BI2SR2CACU2O8+X FROM MEASUREMENTS OF THE LOW-TEMPERATURE SPECIFIC-HEAT
- Authors
- STUPP, SE; LEE, WC; GIAPINTZAKIS, J; GINSBERG, DM
- Issue Date
- Feb-1992
- Publisher
- AMER PHYSICAL SOC
- Citation
- PHYSICAL REVIEW B, v.45, no.6, pp 3093 - 3097
- Pages
- 5
- Journal Title
- PHYSICAL REVIEW B
- Volume
- 45
- Number
- 6
- Start Page
- 3093
- End Page
- 3097
- URI
- https://scholarworks.sookmyung.ac.kr/handle/2020.sw.sookmyung/151144
- DOI
- 10.1103/PhysRevB.45.3093
- ISSN
- 0163-1829
- Abstract
- We have measured the low-temperature (2-10 K) specific heat of polycrystalline Bi2Sr2CaCu2O8+x in zero applied field and in an applied magnetic field of 1 T. We find no field-induced enhancement of the specific heat, to within the 1% resolution of our calorimeter, in a field of 1 T up to 10 K, in contrast to the YBa2Cu3O7-delta system. The results suggest that the enhancements which have been observed in the specific heat result from a temperature dependence of the pinning of vortices in the mixed state. In analyzing our data, we use a model for the enhancement of the specific heat, and find quantitative agreement. Using this model, we place constraints on the allowed temperature dependence of the ab-plane magnetic penetration depth.
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