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Title: Anomalies of magnetoresistance of compounds with atomic clusters RB{sub 12} (R = Ho, Er, Tm, Lu)

Abstract

The magnetoresistance and magnetization of single-crystal samples of rare-earth dodecaborides RB{sub 12} (R = Ho, Er, Tm, Lu) have been measured at low temperatures (1.8-35 K) in a magnetic field of up to 70 kOe. The effect of positive magnetoresistance that obeys the Kohler's rule {delta}{rho}/{rho} = f({rho}(0, 300 K)H/{rho}(0, T)) is observed for the nonmagnetic metal LuB{sub 12}. In the magnetic dodecaborides HoB{sub 12}, ErB{sub 12}, and TmB{sub 12}, three characteristic regimes of the magnetoresistance behavior have been revealed: the positive magnetoresistance effect similar to the case of LuB{sub 12} is observed at T > 25 K; in the range T{sub N} {<=} T {<=} 15 K, the magnetoresistance becomes negative and depends quadratically on the external magnetic field; and, finally, upon the transition to the antiferromagnetic phase (T < T{sub N}), the positive magnetoresistance is again observed and its amplitude reaches 150% for HoB{sub 12}. It has been shown that the observed anomalies of negative magnetoresistance in the paramagnetic phase can be explained within the Yosida model of conduction electron scattering by localized magnetic moments. The performed analysis confirms the formation of spin-polaron states in the 5d band in the vicinity of rare-earth ions in paramagnetic and magneticallymore » ordered phases of RB{sub 12} and makes it possible to reveal a number of specific features in the transformation of the magnetic structure of the compounds under investigation.« less

Authors:
; ; ; ;  [1]; ;  [2]
  1. Russian Academy of Sciences, A. M. Prokhorov General Physics Institute (Russian Federation)
  2. National Academy of Sciences of Ukraine, I. N. Frantsevich Institute for Problems of Materials Science (Ukraine)
Publication Date:
OSTI Identifier:
21246908
Resource Type:
Journal Article
Journal Name:
Journal of Experimental and Theoretical Physics
Additional Journal Information:
Journal Volume: 108; Journal Issue: 4; Other Information: DOI: 10.1134/S1063776109040153; Copyright (c) 2009 Pleiades Publishing, Ltd; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1063-7761
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ANTIFERROMAGNETISM; ATOMIC CLUSTERS; ELECTRON DIFFRACTION; ERBIUM BORIDES; HOLMIUM BORIDES; LUTETIUM BORIDES; MAGNETIC FIELDS; MAGNETIC MOMENTS; MAGNETIZATION; MAGNETORESISTANCE; MONOCRYSTALS; PARAMAGNETISM; TEMPERATURE DEPENDENCE; TEMPERATURE RANGE 0000-0013 K; TEMPERATURE RANGE 0013-0065 K; THULIUM BORIDES

Citation Formats

Sluchanko, N. E., E-mail: nes@lt.gpi.ru, Bogach, A V, Glushkov, V V, Demishev, S V, Samarin, N A, Sluchanko, D N, Dukhnenko, A V, and Levchenko, A V. Anomalies of magnetoresistance of compounds with atomic clusters RB{sub 12} (R = Ho, Er, Tm, Lu). United States: N. p., 2009. Web. doi:10.1134/S1063776109040153.
Sluchanko, N. E., E-mail: nes@lt.gpi.ru, Bogach, A V, Glushkov, V V, Demishev, S V, Samarin, N A, Sluchanko, D N, Dukhnenko, A V, & Levchenko, A V. Anomalies of magnetoresistance of compounds with atomic clusters RB{sub 12} (R = Ho, Er, Tm, Lu). United States. https://doi.org/10.1134/S1063776109040153
Sluchanko, N. E., E-mail: nes@lt.gpi.ru, Bogach, A V, Glushkov, V V, Demishev, S V, Samarin, N A, Sluchanko, D N, Dukhnenko, A V, and Levchenko, A V. Wed . "Anomalies of magnetoresistance of compounds with atomic clusters RB{sub 12} (R = Ho, Er, Tm, Lu)". United States. https://doi.org/10.1134/S1063776109040153.
@article{osti_21246908,
title = {Anomalies of magnetoresistance of compounds with atomic clusters RB{sub 12} (R = Ho, Er, Tm, Lu)},
author = {Sluchanko, N. E., E-mail: nes@lt.gpi.ru and Bogach, A V and Glushkov, V V and Demishev, S V and Samarin, N A and Sluchanko, D N and Dukhnenko, A V and Levchenko, A V},
abstractNote = {The magnetoresistance and magnetization of single-crystal samples of rare-earth dodecaborides RB{sub 12} (R = Ho, Er, Tm, Lu) have been measured at low temperatures (1.8-35 K) in a magnetic field of up to 70 kOe. The effect of positive magnetoresistance that obeys the Kohler's rule {delta}{rho}/{rho} = f({rho}(0, 300 K)H/{rho}(0, T)) is observed for the nonmagnetic metal LuB{sub 12}. In the magnetic dodecaborides HoB{sub 12}, ErB{sub 12}, and TmB{sub 12}, three characteristic regimes of the magnetoresistance behavior have been revealed: the positive magnetoresistance effect similar to the case of LuB{sub 12} is observed at T > 25 K; in the range T{sub N} {<=} T {<=} 15 K, the magnetoresistance becomes negative and depends quadratically on the external magnetic field; and, finally, upon the transition to the antiferromagnetic phase (T < T{sub N}), the positive magnetoresistance is again observed and its amplitude reaches 150% for HoB{sub 12}. It has been shown that the observed anomalies of negative magnetoresistance in the paramagnetic phase can be explained within the Yosida model of conduction electron scattering by localized magnetic moments. The performed analysis confirms the formation of spin-polaron states in the 5d band in the vicinity of rare-earth ions in paramagnetic and magnetically ordered phases of RB{sub 12} and makes it possible to reveal a number of specific features in the transformation of the magnetic structure of the compounds under investigation.},
doi = {10.1134/S1063776109040153},
url = {https://www.osti.gov/biblio/21246908}, journal = {Journal of Experimental and Theoretical Physics},
issn = {1063-7761},
number = 4,
volume = 108,
place = {United States},
year = {2009},
month = {4}
}