Neel temperature of stoichiometric La sub 2 CuO sub 4

Journal Article · Sun Oct 01 04:00:00 EDT 1989 · Physical Review (Section) B: Condensed Matter; (USA)

DOI:https://doi.org/10.1103/PhysRevB.40.6854· OSTI ID:5486507

Saylor, J; Takacs, L; Hohenemser, C ^[1]; Budnick, J I ^[2]; Chamberland, B ^[3]

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1. Department of Physics, Clark University, Worcester, Massachusetts 01610 (US)
2. Department of Physics, University of Connecticut, Storrs, Connecticut 06268
3. Department of Chemistry, University of Connecticut, Storrs, Connecticut 06268

Following doping with {sup 111}In in O{sub 2} gas at 1273 K, samples of La{sub 2}CuO{sub 4+{ital y}} were subjected to vacuum anneals of varying lengths to adjust the oxygen content. Susceptibility studies show that vacuum anneals of {similar to}13 h, starting at 1083 K and terminating at 873 K, consistently produce magnetic ordering at Neel temperature ({ital T}{sub {ital N}})=317(3) K, the highest value yet published. Perturbed-angular-correlation (PAC) studies of the same samples, using the 171--245-keV {gamma}{gamma} cascade of {sup 111}Cd populated via the decay of {sup 111}In, exhibit a combined magnetic-dipole--electric-quadrupole interaction. Analysis of this yields a magnetic hyperfine field and an electric-field-gradient asymmetry that follow the expected temperature dependence of the local magnetization and orthorhombic distortion, respectively. The samples have uniquely static and homogeneous hyperfine interactions with undetectable PAC line broadening. We argue that this implies a defect-free'' probe environment which we identify as stoichiometric with {ital y}{approx equal}0. Assuming that any residual defects are randomly distributed on oxygen lattice sites, we find {vert bar}{ital y}{vert bar}{le}0.016.

• OSTI ID: 5486507
• Journal Information: Physical Review (Section) B: Condensed Matter; (USA), Journal Name: Physical Review (Section) B: Condensed Matter; (USA) Vol. 40:10; ISSN 0163-1829; ISSN PRBMD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ANGULAR CORRELATION
BETA DECAY RADIOISOTOPES
CADMIUM 111
CADMIUM ISOTOPES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
CORRELATIONS
DAYS LIVING RADIOISOTOPES
DOPED MATERIALS
ELECTRON CAPTURE RADIOISOTOPES
EVEN-ODD NUCLEI
INDIUM 111
INDIUM ISOTOPES
INTERMEDIATE MASS NUCLEI
INTERNAL CONVERSION RADIOISOTOPES
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
LANTHANUM COMPOUNDS
LANTHANUM OXIDES
MATERIALS
MINUTES LIVING RADIOISOTOPES
NEEL TEMPERATURE
NUCLEI
ODD-EVEN NUCLEI
OXIDES
OXYGEN COMPOUNDS
PERTURBED ANGULAR CORRELATION
PHYSICAL PROPERTIES
RADIOISOTOPES
RARE EARTH COMPOUNDS
STABLE ISOTOPES
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE