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Magnetic structure of NdB6
Solid State Communications, Vol. 35, pp. i—ill. Pergamon Press Ltd. 1980. Printed in Great Britain.
Abstracts of Articles to be Published in The Journal of Physics and Chemistry of Solids ~JPhys. Chem. Solids (to be published)’ should be cited in references to material quoted from this section prior to the publication of the relevant article. 1.
INFLUENCE OF THE SURFACE
samples of KF, NaF, CaF2, and KU, and other ionic solids. Although the results confirm within approximately 15% the relation and establish a linear dependence of the intensities on analyzer transmission, they suggest that either a slight deviation from the relation exists or a cancellation of errors occurs. Empirically it is found that the relative intensities are proportional to the square of the ratio of kinetic energies, and with this relation, the intensities agree with the theoretical cross-sections within a few percent This relation suggests that the dependence on the angular parameter is inconsequential and that the mean free path is proportional to the kinetic energy.
ANISOTROPY IN THE R.F. COLLAPSE EFFECT MichalKopcewicz, Institute of Experimental Physics, Warsaw University, 00.681 Warszawa, Ho~a69, Poland. The influence of magnetic surface anisotropy Ofl the fast relaxation of the hyperfme field forced by an r.f. field in invar (r.f. collapse effect) has been studied using the Mössbauer technique. The Mossbauer measurements were performed as a function of sample thickness (2.5—12 pm) and intensity (1—9 Oe) of the 50MHz r.f. field applied. Due to the very high sensitivity of the r.f. collapse effect to the anisotropy field it was possible to detect the influence of “spin pinning” on the r.f. collapse effect. It is shown that a decrease of the sample thickness causes a decrease of the r.f. collapse effect at a given r.f. field frequency and intensity which is connected with the increase of the anisotropy field due to surface anisotropy. The dependence of the r.f. sidebands effect, which accompanies the r.f. collapse effect, on the sample thickness is discussed. The r.f. sidebands effect increases with decreasing sample thickness, which is in good agreement with the magnetostriction model of sidebands formation.
Received 7 December 1979 Revised 25 April 1980 3.
Neutron diffraction measurements were made on a polycrystalline sample of NdB6 at 78 K and at 4.2 K. This material orders antiferromagnetically with a Neel temperature of 8.6 K. The magnetic structure inferred from the diffraction data indicates a simple antiferromagnetic doubling of the unit cell in one direction. Based on this structure a profile analysis of the data gives a magnetic moment at 4.2 K of 1.74 Bohr magnetons per neodymium ion.
Received 7 December 1979
Revised 14Apr11 1980 2.
MAGNETIC STRUCTURE OF NdB6 C.M. McCarthy and C.W. Tompson, Physics Department, University of Missouri, Columbia, MO, U.S.A.
RELATION AMONG X-RAY PHOTOELECTRON INTENSITIES, CROSS-SECTIONS, AND KINETIC ENERGIES IN INSULATING SOLIDS Wei-Yean Howng and R.J. Thorn,Chemistry Division, Argonne National Laboratory, Argonne, IL 60439, U.S.A.
Received 22 January 1980 Revised 25 April 1980 4.
THERMAL EXPANSION OF LiF AT HIGH PRESSURES Reinhard Boehler and George C. Kennedy, Institute of Geophysics and Planetary Physics, University of California, Los Angeles, CA, U.S.A.
The fundamental relation among X-ray (M&Ka) photoelectron intensities, theoretical orbital ionization cross-sections, and photoelectron kinetic energies has been investigated through precisely measured relative intensities or orbital electrons from sublimed-condensed
Accurate data on the pressure-volume temperature relationship of LIF are presented and compared with i
Abstracts of Articles to be Published in The Journal of Physics and Chemistry of Solids ~JPhys. Chem. Solids (to be published)’ should be cited in references to material quoted from this section prior to the publication of the relevant article. 1.
INFLUENCE OF THE SURFACE
samples of KF, NaF, CaF2, and KU, and other ionic solids. Although the results confirm within approximately 15% the relation and establish a linear dependence of the intensities on analyzer transmission, they suggest that either a slight deviation from the relation exists or a cancellation of errors occurs. Empirically it is found that the relative intensities are proportional to the square of the ratio of kinetic energies, and with this relation, the intensities agree with the theoretical cross-sections within a few percent This relation suggests that the dependence on the angular parameter is inconsequential and that the mean free path is proportional to the kinetic energy.
ANISOTROPY IN THE R.F. COLLAPSE EFFECT MichalKopcewicz, Institute of Experimental Physics, Warsaw University, 00.681 Warszawa, Ho~a69, Poland. The influence of magnetic surface anisotropy Ofl the fast relaxation of the hyperfme field forced by an r.f. field in invar (r.f. collapse effect) has been studied using the Mössbauer technique. The Mossbauer measurements were performed as a function of sample thickness (2.5—12 pm) and intensity (1—9 Oe) of the 50MHz r.f. field applied. Due to the very high sensitivity of the r.f. collapse effect to the anisotropy field it was possible to detect the influence of “spin pinning” on the r.f. collapse effect. It is shown that a decrease of the sample thickness causes a decrease of the r.f. collapse effect at a given r.f. field frequency and intensity which is connected with the increase of the anisotropy field due to surface anisotropy. The dependence of the r.f. sidebands effect, which accompanies the r.f. collapse effect, on the sample thickness is discussed. The r.f. sidebands effect increases with decreasing sample thickness, which is in good agreement with the magnetostriction model of sidebands formation.
Received 7 December 1979 Revised 25 April 1980 3.
Neutron diffraction measurements were made on a polycrystalline sample of NdB6 at 78 K and at 4.2 K. This material orders antiferromagnetically with a Neel temperature of 8.6 K. The magnetic structure inferred from the diffraction data indicates a simple antiferromagnetic doubling of the unit cell in one direction. Based on this structure a profile analysis of the data gives a magnetic moment at 4.2 K of 1.74 Bohr magnetons per neodymium ion.
Received 7 December 1979
Revised 14Apr11 1980 2.
MAGNETIC STRUCTURE OF NdB6 C.M. McCarthy and C.W. Tompson, Physics Department, University of Missouri, Columbia, MO, U.S.A.
RELATION AMONG X-RAY PHOTOELECTRON INTENSITIES, CROSS-SECTIONS, AND KINETIC ENERGIES IN INSULATING SOLIDS Wei-Yean Howng and R.J. Thorn,Chemistry Division, Argonne National Laboratory, Argonne, IL 60439, U.S.A.
Received 22 January 1980 Revised 25 April 1980 4.
THERMAL EXPANSION OF LiF AT HIGH PRESSURES Reinhard Boehler and George C. Kennedy, Institute of Geophysics and Planetary Physics, University of California, Los Angeles, CA, U.S.A.
The fundamental relation among X-ray (M&Ka) photoelectron intensities, theoretical orbital ionization cross-sections, and photoelectron kinetic energies has been investigated through precisely measured relative intensities or orbital electrons from sublimed-condensed
Accurate data on the pressure-volume temperature relationship of LIF are presented and compared with i