Longitudinal spin fluctuations in nickel

Conference · Tue Oct 10 00:00:00 EDT 1989

OSTI ID:5026824

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

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1. Paul Scherrer Inst. (PSI), Villigen (Switzerland)
2. Institut Laue-Langevin, 38 - Grenoble (France)
3. Brookhaven National Lab., Upton, NY (USA)

The longitudinal and transverse spin fluctuations in Ni have been measured below {Tc} by means of polarized neutron scattering in the momentum range 0.06 < q < 0.18 {angstrom}{sup -1}. In transverse scans spin wave peaks at E{sub q} = Dq{sup 2} appear as expected from early measurements performed with unpolarized neutrons. The longitudinal magnetic scattering {sub {chi}L}(q, E), on the other hand, is quasielastic without any signature of inelastic peaks near E{sub q}. The q and T dependences of {sub {chi}L}(q, E) resemble the paramagnetic scattering above {Tc}, i.e., the linewidth is roughly proportional to q{sup 2.5} and the integrated intensity I(q) is proportional to (q{sup 2} + {kappa}{sub z}{sup 2}){sup -1}. 8 refs., 3 figs.

• Research Organization: Brookhaven National Lab., Upton, NY (USA)
• Sponsoring Organization: DOE/ER
• DOE Contract Number: AC02-76CH00016
• OSTI ID: 5026824
• Report Number(s): BNL-43757; CONF-891117-16; ON: DE90007151; TRN: 90-006406
• Resource Relation: Conference: 34. conference on magnetism and magnetic materials, Boston, MA (USA), 28 Nov - 1 Dec 1989
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
NICKEL 60
SPIN ORIENTATION
FLUCTUATIONS
NEUTRON DIFFRACTION
SCATTERING
TRANSITION TEMPERATURE
COHERENT SCATTERING
DIFFRACTION
EVEN-EVEN NUCLEI
INTERMEDIATE MASS NUCLEI
ISOTOPES
NICKEL ISOTOPES
NUCLEI
ORIENTATION
PHYSICAL PROPERTIES
STABLE ISOTOPES
THERMODYNAMIC PROPERTIES
VARIATIONS
640302* - Atomic
Molecular &amp; Chemical Physics- Atomic &amp; Molecular Properties &amp; Theory