By Gen Shirane, Stephen M. Shapiro, John M. Tranquada
This functional guidebook is written for graduate and post-doctoral scholars, in addition to for knowledgeable researchers new to neutron scattering. Introductory chapters summarize valuable scattering formulation and describe the elements of a spectrometer. The authors then talk about the solution functionality and focusing results. basic examples of phonon and magnon measurements are provided. vital chapters hide spurious results in inelastic and elastic measurements, and the way to prevent them. The final bankruptcy covers suggestions for, and functions of, polarization research.
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Additional resources for Neutron Scattering with a Triple-Axis Spectrometer
Examples (I) and (II) are ﬁctitious models for demonstration. (III) is actually observed in K2 NiF4 and La2 CuO4 . In each case, Bragg intensities from equal populations of domains (a) and (b) are equal to those from structure (c). Note that I(c) is a collinear structure, while II(c) and III(c) are noncollinear. For collinear structures, one can work out explicit symmetry-dependent formulas for domain-averaged magnetic intensities (Shirane, 1959). 6 shows some examples of magnetic structures with diﬀerent structural and magnetic symmetries.
J. (1985). Nucl. Instrum. Methods B 12, 525. References 19 Lovesey, S. W. (1984). Theory of Neutron Scattering from Condensed Matter (Clarendon Press, Oxford). Mezei, F. (1972). Z. Phys. 255, 146. Price, D. L. and Sk¨ old, D. L. (1986). In Methods of Experimental Physics, Vol. 23: Neutron Scattering, ed. K. Sk¨ old and D. L. Price (Academic Press, Orlando), Part A, p. 1. Windsor, C. G. (1981). Pulsed Neutron Diﬀraction (Taylor Francis, London). 1 Introduction Consider a monoenergetic beam of neutrons characterized by wave vector ki and ﬂux φ(ki ), incident on a sample.
7(d). A cold source emits a neutron beam with a relatively broad band of energies which is then polarized by a supermirror. The spin of the neutron is ﬂipped so that it is perpendicular to the magnetic ﬁeld of the solenoid. The neutron will then make a number of Larmor precessions which depend upon the ﬁeld strength and the length of the ﬁeld region. The neutrons then strike the sample and gain or lose a small amount of energy. The spins are ﬂipped 180◦ and enter a second precession ﬁeld where they precess in the opposite direction.