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 04:00:00 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), Journal Name: Physical Review, B: Condensed Matter; (USA) Vol. 43:7; ISSN PRBMD; ISSN 0163-1829
• 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
BARIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
KONDO EFFECT
MAGNETISM
MAGNONS
NEEL TEMPERATURE
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
PRASEODYMIUM COMPOUNDS
PRASEODYMIUM OXIDES
QUANTITY RATIO
QUASI PARTICLES
RARE EARTH COMPOUNDS
SPECIFIC HEAT
SUPERCONDUCTIVITY
TEMPERATURE DEPENDENCE
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
ULTRALOW TEMPERATURE
VERY LOW TEMPERATURE
YTTRIUM COMPOUNDS
YTTRIUM OXIDES