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Title: Effect of host paramagnetic ions on the Gd{sup 3+} EPR linewidth in diluted Van-Vleck paramagnets Tm{sub {ital x}}Lu{sub 1{minus}{ital x}}PO{sub 4} and Ho{sub {ital x}}Y{sub 1{minus}{ital x}}VO{sub 4} and EPR spectra of Er{sup 3+} in Ho{sub {ital x}}Y{sub 1{minus}{ital x}}VO{sub 4}

Abstract

Gd{sup 3+} EPR linewidths in diluted Van-Vleck paramagnets Ho{sub {ital x}}Y{sub 1{minus}{ital x}}VO{sub 4} ({ital x}=0.0,0.02,0.05,0.1,0.15,0.25,0.3,0.5,0.9,1.0) and Tm{sub {ital x}}Lu{sub 1{minus}{ital x}}PO{sub 4} ({ital x}=0.0,0.1,0.2,0.4,0.6,0.8,1.0) were measured at {ital X} band (8.7{endash}9.6 GHz) in the temperature range 4.2{endash}300 K as functions of temperature and concentration ({ital x}) of the host paramagnetic ions, Ho{sup 3+} and Tm{sup 3+}, respectively. It was found that the dipole-dipole and exchange interactions significantly influenced the measured linewidths in Ho{sub {ital x}}Y{sub 1{minus}{ital x}}VO{sub 4} and Tm{sub {ital x}}Lu{sub 1{minus}{ital x}}PO{sub 4} samples for the concentrations {ital x}{approx_gt}0.1 and {ital x}{approx_gt}0.6, respectively. Further, in Ho{sub {ital x}}Y{sub 1{minus}{ital x}}VO{sub 4} samples with {ital x}{approx_gt}0.3 the EPR lines disappeared at temperatures above 10 K due to the formation of percolation clusters by Ho{sup 3+} ions; the disorder was deduced to have a negligible effect in these hosts. Interaction of the lattice with the electronic quadrupole moment of Ho{sup 3+} ions created different structural sites of Gd{sup 3+} in Ho{sub {ital x}}Y{sub 1{minus}{ital x}}VO{sub 4} samples with {ital x}{approx_gt}0.1 depending on the number of Ho{sup 3+} ions in the immediate neighborhood of a Gd{sup 3+} ion, resulting in the observation of up to three different sets of Gd{supmore » 3+} EPR spectra. As for Tm{sub {ital x}}Lu{sub 1{minus}{ital x}}PO{sub 4} samples with 0.1{lt}{ital x}{lt}0.8, it was the disorder, rather than a percolation cluster, that dominated the Gd{sup 3+} EPR linewidths due to the rather large difference in the ionic radii of Tm{sup 3+} and Lu{sup 3+} ions, as well as in the unit-cell parameters of TmPO{sub 4} and LuPO{sub 4}. (Abstract Truncated)« less

Authors:
;  [1]
  1. Department of Physics, Concordia University, 1455 de Maisonneuve Boulevard West, Montreal, Quebec, H3G 1M8 (CANADA)
Publication Date:
OSTI Identifier:
371346
Resource Type:
Journal Article
Journal Name:
Physical Review, B: Condensed Matter
Additional Journal Information:
Journal Volume: 53; Journal Issue: 17; Other Information: PBD: May 1996
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; THULIUM PHOSPHATES; ELECTRONIC STRUCTURE; LUTETIUM PHOSPHATES; HOLMIUM OXIDES; YTTRIUM OXIDES; VANADIUM OXIDES; GADOLINIUM IONS; ELECTRON SPIN RESONANCE; ERBIUM IONS; PARAMAGNETISM; MULTICHARGED IONS; TEMPERATURE DEPENDENCE; TEMPERATURE RANGE 0000-0013 K; TEMPERATURE RANGE 0013-0065 K; TEMPERATURE RANGE 0065-0273 K; TEMPERATURE RANGE 0273-0400 K

Citation Formats

Misra, S K, and Andronenko, S I. Effect of host paramagnetic ions on the Gd{sup 3+} EPR linewidth in diluted Van-Vleck paramagnets Tm{sub {ital x}}Lu{sub 1{minus}{ital x}}PO{sub 4} and Ho{sub {ital x}}Y{sub 1{minus}{ital x}}VO{sub 4} and EPR spectra of Er{sup 3+} in Ho{sub {ital x}}Y{sub 1{minus}{ital x}}VO{sub 4}. United States: N. p., 1996. Web. doi:10.1103/PhysRevB.53.11631.
Misra, S K, & Andronenko, S I. Effect of host paramagnetic ions on the Gd{sup 3+} EPR linewidth in diluted Van-Vleck paramagnets Tm{sub {ital x}}Lu{sub 1{minus}{ital x}}PO{sub 4} and Ho{sub {ital x}}Y{sub 1{minus}{ital x}}VO{sub 4} and EPR spectra of Er{sup 3+} in Ho{sub {ital x}}Y{sub 1{minus}{ital x}}VO{sub 4}. United States. https://doi.org/10.1103/PhysRevB.53.11631
Misra, S K, and Andronenko, S I. Wed . "Effect of host paramagnetic ions on the Gd{sup 3+} EPR linewidth in diluted Van-Vleck paramagnets Tm{sub {ital x}}Lu{sub 1{minus}{ital x}}PO{sub 4} and Ho{sub {ital x}}Y{sub 1{minus}{ital x}}VO{sub 4} and EPR spectra of Er{sup 3+} in Ho{sub {ital x}}Y{sub 1{minus}{ital x}}VO{sub 4}". United States. https://doi.org/10.1103/PhysRevB.53.11631.
@article{osti_371346,
title = {Effect of host paramagnetic ions on the Gd{sup 3+} EPR linewidth in diluted Van-Vleck paramagnets Tm{sub {ital x}}Lu{sub 1{minus}{ital x}}PO{sub 4} and Ho{sub {ital x}}Y{sub 1{minus}{ital x}}VO{sub 4} and EPR spectra of Er{sup 3+} in Ho{sub {ital x}}Y{sub 1{minus}{ital x}}VO{sub 4}},
author = {Misra, S K and Andronenko, S I},
abstractNote = {Gd{sup 3+} EPR linewidths in diluted Van-Vleck paramagnets Ho{sub {ital x}}Y{sub 1{minus}{ital x}}VO{sub 4} ({ital x}=0.0,0.02,0.05,0.1,0.15,0.25,0.3,0.5,0.9,1.0) and Tm{sub {ital x}}Lu{sub 1{minus}{ital x}}PO{sub 4} ({ital x}=0.0,0.1,0.2,0.4,0.6,0.8,1.0) were measured at {ital X} band (8.7{endash}9.6 GHz) in the temperature range 4.2{endash}300 K as functions of temperature and concentration ({ital x}) of the host paramagnetic ions, Ho{sup 3+} and Tm{sup 3+}, respectively. It was found that the dipole-dipole and exchange interactions significantly influenced the measured linewidths in Ho{sub {ital x}}Y{sub 1{minus}{ital x}}VO{sub 4} and Tm{sub {ital x}}Lu{sub 1{minus}{ital x}}PO{sub 4} samples for the concentrations {ital x}{approx_gt}0.1 and {ital x}{approx_gt}0.6, respectively. Further, in Ho{sub {ital x}}Y{sub 1{minus}{ital x}}VO{sub 4} samples with {ital x}{approx_gt}0.3 the EPR lines disappeared at temperatures above 10 K due to the formation of percolation clusters by Ho{sup 3+} ions; the disorder was deduced to have a negligible effect in these hosts. Interaction of the lattice with the electronic quadrupole moment of Ho{sup 3+} ions created different structural sites of Gd{sup 3+} in Ho{sub {ital x}}Y{sub 1{minus}{ital x}}VO{sub 4} samples with {ital x}{approx_gt}0.1 depending on the number of Ho{sup 3+} ions in the immediate neighborhood of a Gd{sup 3+} ion, resulting in the observation of up to three different sets of Gd{sup 3+} EPR spectra. As for Tm{sub {ital x}}Lu{sub 1{minus}{ital x}}PO{sub 4} samples with 0.1{lt}{ital x}{lt}0.8, it was the disorder, rather than a percolation cluster, that dominated the Gd{sup 3+} EPR linewidths due to the rather large difference in the ionic radii of Tm{sup 3+} and Lu{sup 3+} ions, as well as in the unit-cell parameters of TmPO{sub 4} and LuPO{sub 4}. (Abstract Truncated)},
doi = {10.1103/PhysRevB.53.11631},
url = {https://www.osti.gov/biblio/371346}, journal = {Physical Review, B: Condensed Matter},
number = 17,
volume = 53,
place = {United States},
year = {1996},
month = {5}
}