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Title: Absence of Magnetism in Hcp Iron-Nickel at 11K

Abstract

Synchrotron Moessbauer spectroscopy (SMS) was performed on an hcp-phase alloy of composition Fe{sub 92}Ni{sub 8} 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.

Authors:
; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Brookhaven National Laboratory (BNL) National Synchrotron Light Source
Sponsoring Org.:
Doe - Office Of Science
OSTI Identifier:
930619
Report Number(s):
BNL-80939-2008-JA
Journal ID: ISSN 0031-9007; PRLTAO; TRN: US0901421
DOE Contract Number:
DE-AC02-98CH10886
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review Letters; Journal Volume: 97
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; ALLOYS; ANTIFERROMAGNETISM; APPROXIMATIONS; DETECTION; DENSITY FUNCTIONAL METHOD; EXCITED STATES; FLUCTUATIONS; IRON COMPOUNDS; LIFETIME; MAGNETIC FIELDS; MAGNETISM; MOESSBAUER EFFECT; SPECTROSCOPY; NICKEL COMPOUNDS; PRESSURE RANGE GIGA PA; SPECTRA; SYNCHROTRON RADIATION; TEMPERATURE RANGE 0000-0013 K; national synchrotron light source

Citation Formats

Papandrew,A., Lucas, M., Stevens, R., Halevy, I., Fultz, B., Hu, M., Chow, P., Cohen, R., and Somayazulu, M. Absence of Magnetism in Hcp Iron-Nickel at 11K. United States: N. p., 2006. Web. doi:10.1103/PhysRevLett.97.087202.
Papandrew,A., Lucas, M., Stevens, R., Halevy, I., Fultz, B., Hu, M., Chow, P., Cohen, R., & Somayazulu, M. Absence of Magnetism in Hcp Iron-Nickel at 11K. United States. doi:10.1103/PhysRevLett.97.087202.
Papandrew,A., Lucas, M., Stevens, R., Halevy, I., Fultz, B., Hu, M., Chow, P., Cohen, R., and Somayazulu, M. Sun . "Absence of Magnetism in Hcp Iron-Nickel at 11K". United States. doi:10.1103/PhysRevLett.97.087202.
@article{osti_930619,
title = {Absence of Magnetism in Hcp Iron-Nickel at 11K},
author = {Papandrew,A. and Lucas, M. and Stevens, R. and Halevy, I. and Fultz, B. and Hu, M. and Chow, P. and Cohen, R. and Somayazulu, M.},
abstractNote = {Synchrotron Moessbauer spectroscopy (SMS) was performed on an hcp-phase alloy of composition Fe{sub 92}Ni{sub 8} 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.},
doi = {10.1103/PhysRevLett.97.087202},
journal = {Physical Review Letters},
number = ,
volume = 97,
place = {United States},
year = {Sun Jan 01 00:00:00 EST 2006},
month = {Sun Jan 01 00:00:00 EST 2006}
}