Neutron Scattering from Magnetic Materials part 10 pot

... Fe for q along [100 ] (Blackman et al. [42]). Fig. 25. Contours of the scattered neutron intensities from magnetic excitations in Fe for q along [100 ] (from Blackman et al. [42]). Magnetic excitations ... scattered intensity contours along [100 ] from Fe (from Paul et al. [44]). Fig. 28. Experimental scattered intensity contours along [111] from Fe (from Paul et al. [44]). Ma...

Ngày tải lên: 12/08/2014, 02:23

... gov- ern spin-dependent neutron reflection from magnetic materials, we can use what we have learned thus far about reflection from nonmagnetic media and the spin-dependent neutron wave function to ... Lovesey, Theory of Neutron Scattering from Condensed Matter, vols. 1 and 2, Clarendon, Oxford (1987). [14] E. Balcar and S.W. Lovesey, Theory of Magnetic Neutron and Photon S...

Ngày tải lên: 12/08/2014, 02:23

... different aspects of neutron scattering from magnetic mate- rials. I intentionally chose the title Neutron Scattering from Magnetic Materials rather than Magnetic Neutron Scattering to emphasize ... mainly consider magnetic neutron scattering. However, neutron scattering intensity from magnetic materials is a superposition of both types of scattering. In or...

Ngày tải lên: 12/08/2014, 02:23

... of the magnetic moments. 5.1.1. Spin–slip magnetic structures of holmium. The magnetic structure of Ho has been investigated both by neutron and by more recently developed X-ray magnetic scattering [27–29]. ... structures discussed above. If the magnetic structure is antiferromagnetic with a propagation vector k =0 then magnetic Bragg scattering is present at positions whic...

Ngày tải lên: 12/08/2014, 02:23

... 135 5.1. First example,  k =0 135 5.2. Second example,  k =0 146 References 150 NEUTRON SCATTERING FROM MAGNETIC MATERIALS Edited by Tapan Chatterji © 2006 Elsevier B.V. All rights reserved 93 88 ... directions of the magnetic scatterings with respect to the incident neutron beam, the magnetic periodicity (defined by wave vectors  k in the reciprocal space) can be deduced,...

Ngày tải lên: 12/08/2014, 02:23

... 0  B ∗ (r j ,t). (43) The two first partial cross-sections are the non-spin-flip partial cross-sections. Equa- tions (108 ) and (109 ) show that they concern the nuclear amplitude N and the magnetic component of  M ⊥ which ... iron. At the opposite end, magnetic scattering in the paramagnetic β and γ phases of solid oxygen [46–48] give examples of antiferromagnetic correlations. Figure...

Ngày tải lên: 12/08/2014, 02:23

... Forsyth and F. Tasset, Proc. Roy. Soc. London Ser. A 442 147 (1993). [10] P.J. Brown, in: Neutron Scattering from Magnetic Materials, ed. T. Chatterji, Chap. 5, Elsevier (2005), this volume. [11] ... different, P(a) =  10 0 0 (cos 2 φ −1)/(1 +cos 2 φ) 2cosφ/(1 +cos 2 φ) 0 2cosφ/(1 +cos 2 φ) (1 −cos 2 φ)/(1 +cos 2 φ)  , P(b) =  10 0 010 00−1  , P(c) =  100 0 10 001  ....

Ngày tải lên: 12/08/2014, 02:23

... (27) Here the neutron scattering cross-section has been broken into two parts: (1) the part mul- tiplied by (1 −Q 2 z ) is the longitudinal part of the cross-section, while the term multiplied Magnetic ... transverse part. In the linear spin wave approximation S z (t) = S z (0), therefore the longitudinal part leads to elastic scattering and does not concern us here. So the tra...

Ngày tải lên: 12/08/2014, 02:23

... and 5 give the measured neutron cross-sections around (100 ) and (001), respectively. Paramagnetic and critical scattering 357 Fig. 16. (a) Diffuse magnetic scattering from La 1.2 Sr 1.8 Mn 2 O 7 in ... of the vector at which the diffuse magnetic scattering is centered (from Chattopadhyay et al. [19]). (a) (b) Fig. 8. (a) Diffuse magnetic neutron scattering from MnS 2 i...

Ngày tải lên: 12/08/2014, 02:23

... atoms, ˇ V M = 2π ¯ h 2 m  Np z Np x −iNp y Np x +iNp y −Np z  , (60) where the magnitude of the magnetic scattering length p is associated with a given atomic magnetic moment. The magnetic scattering length p arises from the atom’s unpaired elec- trons ... in (34) we defined a magnetic scattering length ρ M .Hereρ M =Np. The total spin-dependent interaction potential operato...

Ngày tải lên: 12/08/2014, 02:23