Longitudinal spin fluctuations in nickel

Journal Article · Tue May 01 00:00:00 EDT 1990 · Journal of Applied Physics; (USA)

DOI:https://doi.org/10.1063/1.345836· OSTI ID:6906357

Boeni, P ^[1]; Martinez, J L ^[2]; Tranquada, J M ^[3]

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1. Paul Scherrer Institut, 5232 Villigen PSI, Switzerland (CH)
2. Institut Laue-Langevin, 38042 Grenoble Cedex (France)
3. Brookhaven National Laboratory, Upton, New York 11973 (USA)

The longitudinal and transverse spin fluctuations in Ni have been measured below {ital T}{sub {ital c}} by means of polarized neutron scattering in the momentum range 0.06{lt}{ital q}{lt}0.18 A{sup {minus}1}. In transverse scans spin-wave peaks at {ital E}{sub {ital q}}={ital Dq}{sup 2} appear as expected from early measurements performed with unpolarized neutrons. The longitudinal magnetic scattering {chi}{sub {ital L}}({ital q},{ital E}), on the other hand, is quasielastic without any signature of inelastic peaks near {ital E}{sub {ital q}}. The {ital q} and {ital T} dependencies of {chi}{sub {ital L}}({ital q},{ital E}) resemble the paramagnetic scattering above {ital T}{sub {ital C}}, i.e., the linewidth is roughly proportional to {ital q}{sup 2.5} and the integrated intensity {ital I}({ital q}) is proportional to ({ital q}{sup 2}+{kappa}{sup 2}{sub {ital z}}){sup {minus}1}.

• DOE Contract Number: AC02-76CH00016
• OSTI ID: 6906357
• Journal Information: Journal of Applied Physics; (USA), Vol. 67:9; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
NICKEL
SPIN
FLUCTUATIONS
LINE WIDTHS
MONOCRYSTALS
NEUTRON DIFFRACTION
POLARIZATION
ANGULAR MOMENTUM
COHERENT SCATTERING
CRYSTALS
DIFFRACTION
ELEMENTS
METALS
PARTICLE PROPERTIES
SCATTERING
TRANSITION ELEMENTS
VARIATIONS
360104* - Metals & Alloys- Physical Properties