Resonant x-ray scattering study of magnetic ordering due to Fermi-surface nesting in SmNi2Ge2
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2002-02-01
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American Physical Society
Abstract
We report the results of x-ray resonant scattering studies of samarium nickel germanide (SmNi2Ge2) compound. We confirm that the magnetic structures of this material are in accordance with Fermi-surface nesting as was hypothesized earlier, SmNi2Ge2 orders in an incommensurate anti ferromagnetic (AF) structure characterized by a single propagation vector q = (0,0,q(z)). The value of q(z) is temperature dependent and approaches similar to0.775 r.l.u. near T-N = 17.7 K. Below T-t = 11.8 K, the AF structure is characterized by q(z) = 0.79 +/- 0.002, indicating a long-period-ordered phase. Ordered moments are confined to the basal plane in both the phases, as evidenced by the Q dependence of the magnetic-peak intensities. The temperature dependence of the magnetic structures is consistent with the "superzone" gap theory. In addition, a strong quadrupolar resonance below the Sm L-III edge was observed and compared to recent theoretical work.
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This article is published as Islam, Zahirul, J. C. Lang, L. Vasiliu-Doloc, G. Srajer, and P. C. Canfield. "Resonant x-ray scattering study of magnetic ordering due to Fermi-surface nesting in SmNi 2 Ge 2." Physical Review B 65, no. 5 (2001): 054404.
DOI: 10.1103/PhysRevB.65.054404.
Copyright 2002 American Physical Society.
Posted with permission.