Low-temperature specific heat of the Y sub 1 minus x Pr sub x Ba sub 2 Cu sub 3 O sub 7 minus. delta. system

Journal Article · Fri Mar 01 00:00:00 EST 1991 · Physical Review, B: Condensed Matter; (USA)

DOI:https://doi.org/10.1103/PhysRevB.43.5430· OSTI ID:5562656

ghamaty, S; Lee, B W; Neumeier, J J; Nieva, G; Maple, M B ^[1]

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1. Department of Physics, University of California, San Diego, La Jolla, California 92093 (USA) Institute for Pure and Applied Physical Sciences, University of California, San Diego, La Jolla, California 92093 (USA)

Low-temperature specific-heat {ital C} measurements as a function of temperature {ital T} between 0.5 and 30 K are reported for Y{sub 1{minus}{ital x}}Pr{sub {ital x}}Ba{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} compounds with {ital x}=0, 0.2, 0.3, 0.4, 0.6, 0.8, and 1.0. The Pr contribution to the specific heat of all of the samples can be described as the sum of a Pr nuclear Schottky anomaly of the form {ital C}{sub {ital N}}({ital T})={ital AT}{sup {minus}2}, a linear term {ital C}{sub {ital L}}({ital T})={gamma}{ital T}, and a Pr magnetic anomaly. For compounds with {ital x}{le}0.6, which are metallic and superconducting, the Pr magnetic specific-heat anomaly has the same temperature dependence as a Kondo anomaly. For the compounds with {ital x}{ge}0.8, which are insulating, the magnetic specific-heat anomaly is consistent with antiferromagnetic ordering of the Pr ions with Neel temperatures {ital T}{sub {ital N}} of 10.9 and 15.7 K for {ital x}=0.8 and 1.0, respectively. For {ital T}{lt}{ital T}{sub {ital N}}, the antiferromagnetic specific-heat anomaly has the form {ital C}{sub {ital M}}({ital T})={ital MT}{sup 3}, characteristic of three-dimensional antiferromagnetic magnons.

• DOE Contract Number: FG03-86ER45230
• OSTI ID: 5562656
• Journal Information: Physical Review, B: Condensed Matter; (USA), Vol. 43:7; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BARIUM OXIDES
SPECIFIC HEAT
COPPER OXIDES
PRASEODYMIUM OXIDES
YTTRIUM OXIDES
ANTIFERROMAGNETISM
KONDO EFFECT
MAGNONS
NEEL TEMPERATURE
QUANTITY RATIO
SUPERCONDUCTIVITY
TEMPERATURE DEPENDENCE
ULTRALOW TEMPERATURE
VERY LOW TEMPERATURE
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
CHALCOGENIDES
COPPER COMPOUNDS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
MAGNETISM
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
PRASEODYMIUM COMPOUNDS
QUASI PARTICLES
RARE EARTH COMPOUNDS
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
YTTRIUM COMPOUNDS
360204* - Ceramics
Cermets
& Refractories- Physical Properties