Polarized neutron study of the paramagnetic scattering from <i>γ</i>-Fe

P. Böni; G. Shirane; J. P. Wicksted; C. Stassis

doi:10.1103/PhysRevB.31.4597

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Polarized neutron study of the paramagnetic scattering from γ-Fe

P. Böni, G. Shirane, and J. P. Wicksted

C. Stassis

Brookhaven National Laboratory, Upton, New York 11973

Ames Laboratory, Iowa State University, Ames, Iowa 50011

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Phys. Rev. B 31, 4597 – Published 1 April, 1985

DOI: https://doi.org/10.1103/PhysRevB.31.4597

Abstract

High-resolution polarized and unpolarized neutron scattering experiments have been performed in order to characterize the paramagnetic scattering from the γ-phase (fcc) of metallic iron. Assuming that the width Γ of the energy distribution of the paramagnetic scattering varies like $q^{δ}$ , the experimental results are consistent with values of δ between 1 and 1.5. Therefore, for γ-Fe, the q dependence of Γ does not follow the behavior predicted for a ferromagnet (δ≥2) by dynamical scaling. On the other hand, the results demonstrate that the spin-spin correlations in γ-Fe are ferromagnetic in nature, characterized by an inverse correlation length between approximately 0.25 and 1 A $̊^{- 1}$ . This result is consistent with the conclusions reached in recent neutron scattering experiments which were performed on γ-Fe at higher momentum transfers.

References (21)

T. Moriya, J. Magn. Magn. Mater. 31-34, 10 (1983), and references therein.
M. F. Collins, V. J. Minkiewicz, R. Nathans, L. Passell and G. Shirane, Phys. Rev. 179, 417 (1969).
J. W. Lynn, Phys. Rev. B 11, 2624 (1975).
K. R. A. Ziebeck and P. J. Brown, J. Phys. F 10, 2015 (1980).
K. R. A. Ziebeck, P. J. Webster, P. J. Brown and J. A. C. Bland, J. Magn. Magn. Mater. 24, 258 (1981).
P. J. Brown, H. Capellmann, J. De ´portes, D. Givord and K. R. A. Ziebeck, J. Magn. Magn. Mater. 30, 243 (1982).
O. Steinsvoll, C. F. Majkrzak, G. Shirane and J. P. Wicksted, Phys. Rev. Lett. 51, 300 (1983); Phys. Rev. B 30, 2377 (1984).
J. P. Wicksted, G. Shirane and O. Steinsvoll, Phys. Rev. B 29, 488 (1984); J. Appl. Phys. 55, 1893 (1984).
J. P. Wicksted, P. Böni and G. Shirane, Phys. Rev. B 30, 3655 (1984).
J. Madsen, O. K. Andersen, U. K. Poulsen, and O. Jepsen, in Magnetism and Magnetic Materials—1975 (Philadelphia), Proceedings of the 21st Annual Conference on Magnetism and Magnetic Materials, edited by J. J. Becker, G. H. Lander, and J. J. Rhyne (AIP, New York, 1976), p. 327.
U. K. Poulsen, J. Kollar and O. K. Andersen, J. Phys. F 6, L241 (1976).
D. G. Pettifor and D. M. Roy, Solid State Commun. 27, 677 (1978).
D. Bagayoko and J. Callaway, Phys. Rev. B 28, 5419 (1983).
E. I. Kondorskii icar, J. Exptl. Theoret. Phys. (U.S.S.R.) 37, 1819 (1959) [Sov. Phys.—JETP 10, 1284 (1960)].
E. P. Wohlfarth, J. Magn. Magn. Mater. 10, 120 (1979).
P. J. Brown, H. Capellmann, J. De ´portes, D. Givord and K. R. A. Ziebeck, J. Magn. Magn. Mater. 30, 335 (1983).
A. P. Murani (unpublished).
R. Re ´sibois and C. Piette, Phys. Rev. Lett. 24, 514 (1970).
W. Sucksmith and R. R. Pearce, Proc. R. Soc. London, Ser. A 167, 189 (1938).
This conclusion is also consistent with unpolarized neutron measurements performed by us using better resolution ( Δ E = 0.28 meV) and better statistics.
Discussion between one of the authors (G.S.) and A. P. Murani.

[c1] T. Moriya, J. Magn. Magn. Mater. 31-34, 10 (1983), and references therein.

[c2] M. F. Collins, V. J. Minkiewicz, R. Nathans, L. Passell and G. Shirane, Phys. Rev. 179, 417 (1969).

[c3] J. W. Lynn, Phys. Rev. B 11, 2624 (1975).

[c4] K. R. A. Ziebeck and P. J. Brown, J. Phys. F 10, 2015 (1980).

[c5] K. R. A. Ziebeck, P. J. Webster, P. J. Brown and J. A. C. Bland, J. Magn. Magn. Mater. 24, 258 (1981).

[c6] P. J. Brown, H. Capellmann, J. De ´portes, D. Givord and K. R. A. Ziebeck, J. Magn. Magn. Mater. 30, 243 (1982).

[c7] O. Steinsvoll, C. F. Majkrzak, G. Shirane and J. P. Wicksted, Phys. Rev. Lett. 51, 300 (1983); Phys. Rev. B 30, 2377 (1984).

[c8] J. P. Wicksted, G. Shirane and O. Steinsvoll, Phys. Rev. B 29, 488 (1984); J. Appl. Phys. 55, 1893 (1984).

[c9] J. P. Wicksted, P. Böni and G. Shirane, Phys. Rev. B 30, 3655 (1984).

[c10] J. Madsen, O. K. Andersen, U. K. Poulsen, and O. Jepsen, in Magnetism and Magnetic Materials—1975 (Philadelphia), Proceedings of the 21st Annual Conference on Magnetism and Magnetic Materials, edited by J. J. Becker, G. H. Lander, and J. J. Rhyne (AIP, New York, 1976), p. 327.

[c11] U. K. Poulsen, J. Kollar and O. K. Andersen, J. Phys. F 6, L241 (1976).

[c12] D. G. Pettifor and D. M. Roy, Solid State Commun. 27, 677 (1978).

[c13] D. Bagayoko and J. Callaway, Phys. Rev. B 28, 5419 (1983).

[c14] E. I. Kondorskii icar, J. Exptl. Theoret. Phys. (U.S.S.R.) 37, 1819 (1959) [Sov. Phys.—JETP 10, 1284 (1960)].

[c15] E. P. Wohlfarth, J. Magn. Magn. Mater. 10, 120 (1979).

[c16] P. J. Brown, H. Capellmann, J. De ´portes, D. Givord and K. R. A. Ziebeck, J. Magn. Magn. Mater. 30, 335 (1983).

[c17] A. P. Murani (unpublished).

[c18] R. Re ´sibois and C. Piette, Phys. Rev. Lett. 24, 514 (1970).

[c19] W. Sucksmith and R. R. Pearce, Proc. R. Soc. London, Ser. A 167, 189 (1938).

[c20] This conclusion is also consistent with unpolarized neutron measurements performed by us using better resolution ( Δ E = 0.28 meV) and better statistics.

[c21] Discussion between one of the authors (G.S.) and A. P. Murani.

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Polarized neutron study of the paramagnetic scattering from γ-Fe

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