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Title: Influence of the rare-earth element on the effects of the structural and magnetic phase transitions in CeFeAsO, PrFeAsO, and NdFeAsO

Abstract

We present results of transport and magnetic properties and heat capacity measurements on polycrystalline CeFeAsO, PrFeAsO and NdFeAsO. These materials undergo structural phase transitions, spin density wave-like magnetic ordering of small moments on iron and antiferromagnetic ordering of rare-earth moments. The temperature dependence of the electrical resistivity, Seebeck coefficient, thermal conductivity, Hall coefficient and magnetoresistance are reported. The magnetic behavior of the materials have been investigated using Moessbauer spectroscopy and magnetization measurements. Transport and magnetic properties are affected strongly by the structural and magnetic transitions, suggesting significant changes in the band structure and/or carrier mobilities occur, and phonon-phonon scattering is reduced upon transformation to the low-temperature structure. Results are compared with recent reports for LaFeAsO, and systematic variations in properties as the identity of Ln is changed are observed and discussed. As Ln progresses across the rare-earth series from La to Nd, an increase in the hole contributions to the Seebeck coefficient and increases in magnetoresistance and the Hall coefficient are observed in the low-temperature phase. Analysis of hyperfine fields at the iron nuclei determined from Moessbauer spectra indicates that the moment on Fe in the orthorhombic phase is nearly independent of the identity of Ln, in apparent contrast tomore » reports of powder neutron diffraction refinements.« less

Authors:
 [1];  [2];  [1];  [1];  [1];  [1];  [3];  [4]
  1. ORNL
  2. Forschungszentrum Julich, Julich, Germany
  3. University of Liege, Belgium
  4. University of Missouri, Rolla
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
961763
DOE Contract Number:  
DE-AC05-00OR22725
Resource Type:
Journal Article
Journal Name:
New Journal of Physics
Additional Journal Information:
Journal Volume: 11; Journal Issue: 2
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; CARRIER MOBILITY; CERIUM COMPOUNDS; ELECTRIC CONDUCTIVITY; IRON ARSENIDES; MAGNETIC PROPERTIES; MOESSBAUER EFFECT; NEODYMIUM COMPOUNDS; NEUTRON DIFFRACTION; PHASE TRANSFORMATIONS; PRASEODYMIUM COMPOUNDS; RARE EARTH COMPOUNDS; SPECIFIC HEAT; TEMPERATURE DEPENDENCE; TEMPERATURE RANGE 0065-0273 K; THERMAL CONDUCTIVITY; THERMODYNAMIC PROPERTIES

Citation Formats

McGuire, Michael A, Hermann, Raphael P., Safa-Sefat, Athena, Sales, Brian C, Jin, Rongying, Mandrus, David, Grandjean, F., and Long, Gary J. Influence of the rare-earth element on the effects of the structural and magnetic phase transitions in CeFeAsO, PrFeAsO, and NdFeAsO. United States: N. p., 2009. Web. doi:10.1088/1367-2630/11/2/025011.
McGuire, Michael A, Hermann, Raphael P., Safa-Sefat, Athena, Sales, Brian C, Jin, Rongying, Mandrus, David, Grandjean, F., & Long, Gary J. Influence of the rare-earth element on the effects of the structural and magnetic phase transitions in CeFeAsO, PrFeAsO, and NdFeAsO. United States. https://doi.org/10.1088/1367-2630/11/2/025011
McGuire, Michael A, Hermann, Raphael P., Safa-Sefat, Athena, Sales, Brian C, Jin, Rongying, Mandrus, David, Grandjean, F., and Long, Gary J. Thu . "Influence of the rare-earth element on the effects of the structural and magnetic phase transitions in CeFeAsO, PrFeAsO, and NdFeAsO". United States. https://doi.org/10.1088/1367-2630/11/2/025011.
@article{osti_961763,
title = {Influence of the rare-earth element on the effects of the structural and magnetic phase transitions in CeFeAsO, PrFeAsO, and NdFeAsO},
author = {McGuire, Michael A and Hermann, Raphael P. and Safa-Sefat, Athena and Sales, Brian C and Jin, Rongying and Mandrus, David and Grandjean, F. and Long, Gary J.},
abstractNote = {We present results of transport and magnetic properties and heat capacity measurements on polycrystalline CeFeAsO, PrFeAsO and NdFeAsO. These materials undergo structural phase transitions, spin density wave-like magnetic ordering of small moments on iron and antiferromagnetic ordering of rare-earth moments. The temperature dependence of the electrical resistivity, Seebeck coefficient, thermal conductivity, Hall coefficient and magnetoresistance are reported. The magnetic behavior of the materials have been investigated using Moessbauer spectroscopy and magnetization measurements. Transport and magnetic properties are affected strongly by the structural and magnetic transitions, suggesting significant changes in the band structure and/or carrier mobilities occur, and phonon-phonon scattering is reduced upon transformation to the low-temperature structure. Results are compared with recent reports for LaFeAsO, and systematic variations in properties as the identity of Ln is changed are observed and discussed. As Ln progresses across the rare-earth series from La to Nd, an increase in the hole contributions to the Seebeck coefficient and increases in magnetoresistance and the Hall coefficient are observed in the low-temperature phase. Analysis of hyperfine fields at the iron nuclei determined from Moessbauer spectra indicates that the moment on Fe in the orthorhombic phase is nearly independent of the identity of Ln, in apparent contrast to reports of powder neutron diffraction refinements.},
doi = {10.1088/1367-2630/11/2/025011},
url = {https://www.osti.gov/biblio/961763}, journal = {New Journal of Physics},
number = 2,
volume = 11,
place = {United States},
year = {2009},
month = {1}
}