Crystal-field effects in the electron-spin resonance of Gd sup 3+ and Er sup 3+ in Pr sub 2 CuO sub 4

Journal Article · Mon Jul 01 04:00:00 EDT 1991 · Physical Review, B: Condensed Matter; (USA)

DOI:https://doi.org/10.1103/PhysRevB.44.826· OSTI ID:5689569

Rettori, C; Rao, D; Oseroff, S ^[1]; Zysler, R D; Tovar, M ^[2]; Fisk, Z; Cheong, S ^[3]; Schultz, S; Vier, D C ^[4]

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1. San Diego State University, San Diego, California 92182 (USA)
2. Centro Atomico Bariloche, 8400 Barioloche, Rio Negro, Argentina (AR)
3. Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (USA)
4. University of California, San Diego, La Jolla, California 92093-0319 (USA)

The low-temperature ({ital T}{lt}300 K) electron-spin-resonance (ESR) spectra of Gd{sup 3+} and Er{sup 3+} in Pr{sub 2}CuO{sub 4} show symmetry properties appropriate to the crystal tetragonal symmetry. The completely resolved Gd{sup 3+} spectra allowed us to measure, at {ital T}=2 K, the principal {ital g} values {ital g}=1.985(8), {ital g}{sub {perpendicular}}=2.040(8), and the crystal-field parameters ({ital b}{sub 2}{sup 0}={minus}399(2){times}10{sup {minus}4} cm{sup {minus}1}, {ital b}{sub 4}{sup 0}={minus}33.1(7){times}10{sup {minus}4} cm{sup {minus}1}, and {ital b}{sub 4}{sup 4}=205(3){times}10{sup {minus}4} cm{sup {minus}1}). The large broadening of the ESR lines, observed above {ital T}{similar to}40 K, is due to a relaxation via the thermally populated crystal-field excited Pr levels. For Er{sup 3+} in Pr{sub 2}CuO{sub 4} we observe a single ESR line corresponding to a ground-state doublet with {ital g}=17.94(5) and {ital g}{sub {perpendicular}}{le}0.2. The absence of any splittings of the ESR lines below the Neel temperature implies that the magnetostatic dipole field at the rare-earth-ion site due to the antiferromagnetically ordered Cu moments is {lt}45 Oe.

• OSTI ID: 5689569
• Journal Information: Physical Review, B: Condensed Matter; (USA), Journal Name: Physical Review, B: Condensed Matter; (USA) Journal Issue: 2 Vol. 44:2; ISSN 0163-1829; ISSN PRBMD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ANTIFERROMAGNETISM
CHARGED PARTICLES
COPPER COMPOUNDS
CRYSTAL FIELD
CRYSTAL LATTICES
CRYSTAL STRUCTURE
CUPRATES
ELECTRON SPIN RESONANCE
ERBIUM IONS
GADOLINIUM IONS
HIGH-TC SUPERCONDUCTORS
IONS
MAGNETIC RESONANCE
MAGNETISM
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
PRASEODYMIUM COMPOUNDS
RARE EARTH COMPOUNDS
RESONANCE
SUPERCONDUCTORS
SYMMETRY
TETRAGONAL LATTICES
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE