Polarization and resonance studies of x-ray magnetic scattering in holmium

Journal Article · Fri Mar 01 04:00:00 EST 1991 · Physical Review, B: Condensed Matter; (USA)

DOI:https://doi.org/10.1103/PhysRevB.43.5663· OSTI ID:5693074

Gibbs, D; Gruebel, G ^[1]; Harshman, D R; Isaacs, E D; McWhan, D B ^[2]; Mills, D ^[3]; Vettier, C ^[4]

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1. Physics Department, Brookhaven National Laboratory, Upton, New York 11973 (USA)
2. AT T Bell Laboratories, 600 Mountain Ave., Murray Hill, New Jersey 07973 (USA)
3. CHESS, Cornell University, Ithaca, New York 14853 (USA)
4. Institut Laue-Langevin, 38042, Grenoble, CEDEX, (France)

We report the results of an x-ray-scattering study of the polarization and resonance properties of the magnetic cross section of holmium. Off resonance, we have measured the degree of linear polarization for several different chemical and magnetic reflections, and shown that the results are consistent with a nonresonant description of the x-ray-scattering cross section. When the incident x-ray energy is tuned near the {ital L}{sub III} absorption edge, large resonant enhancements of the magnetic scattering, and resonant integer harmonics, are observed. Detailed measurements of the dependence of the integrated magnetic intensity on the incident x-ray energy, on the x-ray momentum transfer, and on the sample temperature are described for incident x-ray energies in a range of 250 eV below and above the {ital L}{sub III} absorption edge. In addition, we have characterized the energy dependence of the linearly {sigma}- and {pi}-polarized components of the magnetic scattering in this range, and fitted the resulting line shapes to a simple model of the resonant cross section, including electric dipole and quadrupole transitions among atomic orbitals. The most striking feature of the line shapes is their asymmetry, which results from the interference of the resonant and nonresonant cross sections. Smaller resonant enhancements of the magnetic scattering are reported for incident x-ray energies tuned near the {ital L}{sub II} and {ital L}{sub I} absorption edges.

• DOE Contract Number: AC02-76CH00016
• OSTI ID: 5693074
• 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
360104* -- Metals & Alloys-- Physical Properties
COHERENT SCATTERING
DIFFRACTION
E1-TRANSITIONS
ELEMENTS
ENERGY DEPENDENCE
ENERGY-LEVEL TRANSITIONS
HOLMIUM
MAGNETIC PROPERTIES
METALS
MULTIPOLE TRANSITIONS
PHYSICAL PROPERTIES
POLARIZATION
RARE EARTHS
SCATTERING
X-RAY DIFFRACTION