SPECIFIC HEAT OF ALUMINUM NEAR ITS SUPERCONDUCTIVE TRANSITION POINT

reportActive / Technical Report | Accession Number: AD0293874 | Open PDF

Abstract:

We have carried out specific heat measurements with a high temperature-resolution in different magnetic fields on three specimens of aluminum. These measurements gave the difference of the specific heat between the superconductive and the normal state, the latent heat and the critical field curve. For a reversible transition, these three quantities are related by thermodynamic equations and hence it is possible to check their consistency. For one sample, this consistency was within experimental error for the two other samples, there was some disagreement between the critical curve as measured and as calculated. The shape of the transition in zero field has been investigated in detail and it was found that the phase change could take place within about 610,000 K for one sample, while for the two others it was spread over two millidegrees. From the width we have estimated the correlation range using Pippards theory.

Author(s):
Rorer, David C. ; Meyer, Horst ; Richardson, Robert C.
Author Organization(s):
DUKE UNIV DURHAM NC
Supplementary Note:
DOI: 10.21236/AD0293874
Pagination:
0041

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release
Distribution Statement:
Approved For Public Release; Distribution Is Unlimited.

RECORD

Collection: TR
Identifying Numbers
Report Number(s):
TR-1
Contract/Grant Number(s):
NONR-118112
Monitor Series:
ONR
 Subject Terms
Joint Capability Areas:
JCA_6.1.3_Switching and Routing; JCA_6_Net Centric; JCA_6.1_Information Transport; JCA_1.2.7_Experimentation; JCA_1_Force Support; JCA_1.2_Force Preparation; JCA_3.2_Engagement; JCA_3_Force Application
Communities of Interest:
Materials and Manufacturing Processes
Descriptor(s):
*ALUMINUM, *SUPERCONDUCTIVITY, *TRANSITION TEMPERATURE, CRYOGENICS, HELIUM, SINGLE CRYSTALS, TEST EQUIPMENT, VAPOR PRESSURE
Field(s)/Group(s):
Inorganic Chemistry, Electricity and Magnetism
Report Date:
1962 Dec 01