Magnetic field dependence of the specific heat of some high-T/sub c/

Conference · Wed Apr 01 04:00:00 EST 1987

OSTI ID:6296300

Phillips, N E; Fisher, R A; Lacy, S E; Marcenat, C; Olsen, J A; Ham, W K; Stacy, A M

The specific heats, C, of 5 samples of La/sub 1.85/M/sub 0.15/CuO/sub 4-y/ (M = Ca, Sr, Ba), one sample of La/sub 2/CuO/sub 4-y/, and one sample of YBa/sub 2/Cu/sub 3/O/sub 9-y/ have been measured between 0.4 and 40K, in magnetic fields, H, to 7T. For the La/sub 1.85/M/sub 0.15/CuO/sub 4-y/ samples the H dependence of C near T/sub c/ and near 1K, where C is dominated by the electronic contribution, gives information about the fraction of the sample that is a bulk superconductor and the density of electronic states. The fraction of bulk superconductivity indicated by the Meissner effect does not correlate well with that indicated by C. La/sub 2/CuO/sub 4-y/ has a linear term in C, in qualitative agreement with a theoretical prediction.

• Research Organization: Lawrence Berkeley Lab., CA (USA)
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 6296300
• Report Number(s): LBL-23531; CONF-870873-8; ON: DE87011101
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
656100 -- Condensed Matter Physics-- Superconductivity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALLOYS
DATA
EXPERIMENTAL DATA
INFORMATION
LANTHANUM ALLOYS
LANTHANUM BASE ALLOYS
MAGNETIC FIELDS
MEISSNER-OCHSENFELD EFFECT
NUMERICAL DATA
PHYSICAL PROPERTIES
RARE EARTH ALLOYS
SPECIFIC HEAT
SUPERCONDUCTORS
TEMPERATURE DEPENDENCE
THERMODYNAMIC PROPERTIES
ULTRALOW TEMPERATURE
VERY LOW TEMPERATURE
YTTRIUM ALLOYS
YTTRIUM BASE ALLOYS