Calorimetric study of nonsuperconducting GdBa/sub 2/Cu/sub 3/O/sub 6+. delta. /

Journal Article · Fri Jan 01 04:00:00 EST 1988 · Modern Physics Letters B; (USA)

DOI:https://doi.org/10.1142/S0217984988001491· OSTI ID:5504584

Ho, J C ^[1]; Huang, C Y ^[2]; Hor, P H; Meng, R L; Chu, C W ^[3]

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1. Wichita State Univ., KS (USA). Dept. of Physics
2. Lockheed Missiles and Space Co., Palo Alto, CA (USA). Research Labs.
3. Houston Univ., TX (USA). Dept. of Physics

In a recent paper the authors reported calorimetric evidence of an antiferromagnetic transition at T/sub N/ = 2.2 {Kappa} in GaBa/sub 2/Cu/sub 3/O/sub 6+{delta}/ with {delta} = 0.7. This was confirmed by a neutron scattering experiment. The compound also exhibits a superconducting transition at T/sub c/ = 94 {Kappa}, and, hence, superconductivity and antiferromagnetism coexit below T/sub N/. It is important to elucidate whether the occurrence of the two critical phenomena is consequential or just accidental. It has been demonstrated that 123 samples with low oxygen content are not superconducting. The study of a nonsuperconducting sample should provide some clues. Thus, the same calorimetric measurements were made on a second GdBa/sub 2/Cu/sub 3/O/sub 6t{delta}/ sample with further oxygen deficiency, {delta} = 0.5. The material is no more superconducting, but magnetic susceptibility studies show that there is still an anomaly at 2.2 {Kappa}. Heat capacity measurements were based on the standard adiabatic calorimetry with Joule heating and germanium thermometry. The results are shown.

• OSTI ID: 5504584
• Journal Information: Modern Physics Letters B; (USA), Journal Name: Modern Physics Letters B; (USA) Vol. 1:11; ISSN MPLBE; ISSN 0217-9849
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
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Cermets
& Refractories-- Structure & Phase Studies
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Cermets
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656100* -- Condensed Matter Physics-- Superconductivity
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALINE EARTH METAL COMPOUNDS
ANTIFERROMAGNETISM
BARIUM COMPOUNDS
BARIUM OXIDES
BARYONS
CALORIMETRY
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
ELECTRIC CONDUCTIVITY
ELECTRIC HEATING
ELECTRICAL PROPERTIES
ELEMENTARY PARTICLES
ELEMENTS
FERMIONS
GADOLINIUM COMPOUNDS
GADOLINIUM OXIDES
GERMANIUM
HADRONS
HEATING
JOULE HEATING
MAGNETIC PROPERTIES
MAGNETIC SUSCEPTIBILITY
MAGNETISM
METALS
NEUTRONS
NUCLEONS
OXIDES
OXYGEN COMPOUNDS
PHASE STUDIES
PHYSICAL PROPERTIES
PLASMA HEATING
RARE EARTH COMPOUNDS
RESISTANCE HEATING
SCATTERING
SUPERCONDUCTIVITY
TRANSITION ELEMENT COMPOUNDS