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Published August 25, 2006 | Published + Supplemental Material
Journal Article Open

Absence of Magnetism in Hcp Iron-Nickel at 11 K


Synchrotron Mössbauer spectroscopy (SMS) was performed on an hcp-phase alloy of composition Fe92Ni8 at a pressure of 21 GPa and a temperature of 11 K. Density functional theoretical calculations predict antiferromagnetism in both hcp Fe and hcp Fe-Ni. For hcp Fe, these calculations predict no hyperfine magnetic field, consistent with previous experiments. For hcp Fe-Ni, however, substantial hyperfine magnetic fields are predicted, but these were not observed in the SMS spectra. Two possible explanations are suggested. First, small but significant errors in the generalized gradient approximation density functional may lead to an erroneous prediction of magnetic order or of erroneous hyperfine magnetic fields in antiferromagnetic hcp Fe-Ni. Alternately, quantum fluctuations with periods much shorter than the lifetime of the nuclear excited state would prohibit the detection of moments by SMS.

Additional Information

© 2006 The American Physical Society (Received 14 February 2006; revised 19 May 2006; published 21 August 2006) We thank I. Mazin, D. Singh, and G. Steinle-Neumann for helpful discussions and H. P. Liermann for assistance with the SMS experiments. This work was supported by the Carnegie-DOE Alliance Center, funded by the Department of Energy through the Stewardship Sciences Academic Alliance Program under Grant No. DE-FC03-03NA00144, and by DOE ASCI/ASAP Subcontract No. B341492 to Caltech DOE No. W-7405-ENG-48 (R.E.C.). Use of the Advanced Photon Source is supported by the U.S. Department of Energy under Contract No. W-31-109-ENG-38. Supplementary information: Methods, parameters, and results from calculations of Neel temperature of hcp Fe. Neel temperature is well above 11 K for two atomic volumes reported.

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Published - PAPprl06.pdf

Supplemental Material - PAPprl06suppl.pdf


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