A 3 T superconducting magnet for long-run magnetic Compton-scattering experiments

Sakai, Nobuhiko; Ohkubo, Hiroshi; Nakamura, Yasushi

doi:10.1107/s0909049597015537

Cited by 18 publications

(12 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The sample's magnetization was reversed with a 2.5 T superconducting magnet. 31 A degree of circular polarization of about 0.7 was obtained with an energy resolution of ⌬Eр5ϫ10 Ϫ3 . The energy spectrum of the scattered x rays was measured by a solid state tenelement Ge detector.…”

Section: Methodsmentioning

confidence: 99%

Spin-dependent electron momentum density in theNi2MnSnHeusler alloy

et al. 2001

View full text Add to dashboard Cite

The spin-dependent electron momentum distribution in Ni 2 MnSn Heusler alloy single crystals was studied using 270 keV circularly polarized synchrotron radiation, through magnetic Compton profile measurements, on the high energy inelastic scattering beamline at SPring-8. The experiments were carried out for the three principal crystallographic directions ͓100͔, ͓110͔, and ͓111͔ at 10 K. The results show that the conduction electrons have a negative spin polarization of 0.34 B ; the 3d spin moment on the nickel site was found to be negligible. A band structure calculation was performed including a hyperfine field study using the full potential linearized augmented plane wave ͑FLAPW͒ method, with the generalized gradient approximation ͑GGA͒ for the electronic exchange and correlation. The spin moment on the Mn site at 10 K was observed as 4.39 B . The spin-dependent Compton profiles for the ͓100͔, ͓110͔, and ͓111͔ directions reported here show anisotropy in the momentum density, which is in good agreement with the FLAPW-GGA results, based on a ferromagnetic ground state. The hyperfine fields calculated were compared with previously calculated hyperfine field of Cu 2 MnAl and Co 2 FeGa Heusler alloys. From the comparison it is seen that the value of H val ͑valence contribution to the hyperfine field͒ is roughly proportional to the spin polarization (m s ) of the s electrons at the X ͑Ni,Cu,Co͒ and Y ͑Mn of Ni 2 MnSn and Cu 2 MnAl, Fe of Co 2 FeGa) atom positions.

show abstract

Section: Methodsmentioning

confidence: 99%

Spin-dependent electron momentum density in theNi2MnSnHeusler alloy

et al. 2001

View full text Add to dashboard Cite

show abstract

“…J mag ͑p z ͒ is the one-dimensional projection of the spin-polarized electron momentum density given by J mag ͑p z ͒ = ͵͵ ͓n↑͑p͒ − n↓͑p͔͒dp x dp y , where n ↑ ͑p͒ and n ↓ ͑p͒ are the momentum densities of the majority and minority spin bands, respectively, and the area under J mag ͑p z ͒ is equal to the total spin moment per f.u. [17][18][19][20] The magnetic moment of 0.92 B / f.u. was assigned to the experimental magnetic Compton profile ͑MCP͒ in comparison with the MCP of standard Fe metal.…”

Section: Magnetization Measurementsmentioning

confidence: 99%

Crystallographic and magnetic properties of the mixed-valence oxidesCaRu1−xMnxO3

et al. 2008

View full text Add to dashboard Cite

The crystallographic and magnetic properties of CaRu 1−x Mn x O 3 ͑0 Յ x Յ 1.0͒ were investigated in detail by x-ray powder diffraction, magnetization, and magnetic Compton scattering measurements. The lattice parameters show considerable deviation from Vegard's law. Ferromagnetism appears at a relatively large Mn concentration ͑x Ն 0.2͒, and the magnetization and the Curie temperature have a maximum at a Mn content near x = 0.7. The magnetic Compton scattering measurement revealed that Mn makes a dominant contribution to the magnetization and the Mn moment is antiparallel to the Ru moment, which is induced by Mn doping. The anomalous change in the unit cell volume and the occurrence of ferromagnetism were discussed on the basis of the mixed-valence model of Mn 3+ , Mn 4+ , Ru 4+ , and Ru 5+ ions. The Mn-composition dependence of the spontaneous magnetization was explained semiquantitatively assuming ͑1͒ ferromagnetic coupling between Mn 3+ and Mn 4+ ions, ͑2͒ antiferromagnetic coupling between Ru 5+ and Mn ions, and ͑3͒ the theoretical spin moments of Mn 3+ , Mn 4+ , and Ru 5+ . The ferromagnetic interaction between Mn 3+ and Mn 4+ ions seems to make a dominant contribution to the Curie temperature. The CaRu 1−x Mn x O 3 system is considered to be a ferrimagnet induced through competition between the ferromagnetic interaction between Mn ions and the antiferromagnetic interaction between Ru 5+ and Mn ions.

show abstract

“…A magnetic Compton scattering (MCS) is a powerful tool to study a magnetic structure [1] because it can evaluate not only the total magnetic moment but also the magnetic moment on composite ions separately. When the incident X-ray is circularly polarized, the scattering crosssection contains a spin-dependent term.…”

Section: Introductionmentioning

confidence: 99%