Linear temperature term of heat capacity in insulating and superconducting La-Ba-Cu-O systems

Journal Article · Mon Feb 22 04:00:00 EST 1988 · Phys. Rev. Lett.; (United States)

DOI:https://doi.org/10.1103/PhysRevLett.60.724· OSTI ID:5418108

Kumagai, K; Nakamichi, Y; Watanabe, I; Nakamura, Y; Nakajima, H; Wada, N; Lederer, P

The heat capacity of La/sub 2-//sub x/Ba/sub x/CuO/sub 4/ was investigated between 0.8 and 10 K. The linear temperature term ..gamma..T of the heat capacity is absent in the antiferromagnetic-ordered region of xless than or equal to0.02. ..gamma.. increases abruptly from x = 0.02 to x = 0.04 where the system is still insulating at low temperature, and seems to saturate at the order of 5 mJ/mol K/sup 2/ in the superconducting region of xgreater than or equal to0.05. The correlation between magnetic order and vanishing ..gamma..T term and the existence of a finite ..gamma..T term for Ba doping give support to the resonating-valence-bond picture.

• Research Organization: Department of Physics, Faculty of Science, Hokkaido University, Sapporo 060, Japan
• OSTI ID: 5418108
• Journal Information: Phys. Rev. Lett.; (United States), Journal Name: Phys. Rev. Lett.; (United States) Vol. 60:8; ISSN PRLTA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ALKALINE EARTH METAL COMPOUNDS
ANTIFERROMAGNETISM
BARIUM COMPOUNDS
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
ELECTRICAL EQUIPMENT
ELECTRICAL INSULATORS
EQUIPMENT
LANTHANUM COMPOUNDS
MAGNETISM
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
RARE EARTH COMPOUNDS
SPECIFIC HEAT
SUPERCONDUCTORS
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
ULTRALOW TEMPERATURE