Neutron Scattering from Magnetic Materials part 7 ppsx

... between Polarized neutrons and polarization analysis 177 where the sum runs over all the magnetic atoms. Two types of terms enter the expression of F M : • one center integrals  ϕ ∗ j e i  Qr ϕ j d 3 r (79 ) which ... are Polarized neutrons and polarization analysis 1 87 Fig. 16. Magnetization in Sm 3 Te 4 : the magnetic field is along [110] (perpendicular to the page). Fig. 17. Magn...

Ngày tải lên: 12/08/2014, 02:23

... . . . 475 2.Techniqueofsmallangleneutronscattering 476 2.1.BasicconceptofSANS 476 2.2.Multiphasesystems 479 2.3.ConventionalSANS:Magneticandnuclearscattering 480 2.4.SANSwithpolarizedneutrons ... Meth. 1 57 4 87 (1 978 ). [43] M. Buttiker, Phys. Rev. B 27 6 178 (1983). [44] V. Nunez, C.F. Majkrzak and N.F. Berk, MRS Symp. Proc. 313 431 (1993). [45] M. Blume and D. Gibbs, Phys. Rev. B 3...

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

... − Ce 3+ ,Pr 4+ 4f 1 1 2 3 5 2 2 F 5 2 6 7 Pr 3+ 4f 2 15 4 3 H 4 4 5 Nd 3+ 4f 3 3 2 6 9 2 4 I 9 2 8 11 Pm 3+ 4f 4 26 4 5 I 4 3 5 Sm 3+ 4f 5 5 2 5 5 2 6 H 5 2 2 7 Eu 3+ ,Sm 2+ 4f 6 33 0 7 F 0 0 Gd 3+ ,Eu 2+ 4f 7 7 2 0 7 2 8 S 7 2 2 Tb 3+ 4f 8 33 ... Clarendon, Oxford (1 975 ). [12] G.L. Squires, Introduction to the Theory of Thermal Neutron Scattering, Cambridge University Press...

Ngày tải lên: 12/08/2014, 02:23

... (1992). [74 ] M. Ain, W. Reichardt, B. Hennion, G. Pepy and B.M. Wanklyn, Physica C 170 371 (1989). [75 ] Y. Ishikawa, T. Tajima, D. Bloch and M. Roth, Solid State Commun. 19 525 (1 976 ). [76 ] B. ... Sect. A 24 2 17 (1968). [7] Yu.A. Izyumov, V.E. Naish and R.P. Ozerov, Neutron Diffraction of Magnetic Materials, Consultants Bu- reau, New York (1991). [8] C. Wilkinson, Philos. Mag....

Ngày tải lên: 12/08/2014, 02:23

... Physica B 156–1 57 6 27 (1989). [9] P.J. Brown, J.B. Forsyth and F. Tasset, Proc. Roy. Soc. London Ser. A 442 1 47 (1993). [10] P.J. Brown, in: Neutron Scattering from Magnetic Materials, ed. T. ... 234–236 78 5 (19 97) . Spherical neutron polarimetry 2 17 Notation a, b, c unit cell vectors θ B Bragg angle g a reciprocal lattice vector γ N gyromagnetic ratio of the neutron κ...

Ngày tải lên: 12/08/2014, 02:23

... waves in bilayer manganite La 2−2x Sr 1+2x Mn 2 O 7 315 6.Concludingremarks 3 27 Acknowledgments 328 References 328 NEUTRON SCATTERING FROM MAGNETIC MATERIALS Edited by Tapan Chatterji © 2006 Elsevier ... +S − −Q (0)S + Q (t)   . ( 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 p...

Ngày tải lên: 12/08/2014, 02:23

... Contours of the scattered neutron intensities from magnetic excitations in Fe for q along [100] (from Blackman et al. [42]). Magnetic excitations 279 bottom of Figure 17 the theoretical spin wave ... Chatterji Fig. 27. Experimental scattered intensity contours along [100] from Fe (from Paul et al. [44]). Fig. 28. Experimental scattered intensity contours along [111] from Fe (f...

Ngày tải lên: 12/08/2014, 02:23

... the measured neutron cross-sections around (100) and (001), respectively. Paramagnetic and critical scattering 3 57 Fig. 16. (a) Diffuse magnetic scattering from La 1.2 Sr 1.8 Mn 2 O 7 in the reciprocal ... 1.6 [001] 0. 67 0.15 La 0. 67 Ca 0.33 MnO 3 250 170 7. 9 La 0.85 Sr 0.15 MnO 3 235 95 (2) 56 [010] 4.62 .76 La 0 .7 Sr 0.3 MnO 3 355 La 0 .7 Ba 0.3 MnO 3 350 152 (3) 32...

Ngày tải lên: 12/08/2014, 02:23

... 415 3.4.Selectinganeutronpolarizationstate 4 17 3.5.Changinganeutron’spolarization 4 17 NEUTRON SCATTERING FROM MAGNETIC MATERIALS Edited by Tapan Chatterji Published by Elsevier B.V. 3 97 406 C.F. Majkrzak ... 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-de...

Ngày tải lên: 12/08/2014, 02:23