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Title: Magnetic remanence in Yb{sub 14−x}RE{sub x}MnSb{sub 11} (RE=Tb, Dy, Ho) single crystals

Abstract

Single crystals of Yb{sub 14−x}RE{sub x}MnSb{sub 11} (x~0.1, 0.4; RE = Tb, Dy, Ho) have been prepared as a solid solution by Sn flux reactions of the elements. They crystallize in the Ca{sub 14}AlSb{sub 11} structure type in the I4{sub 1}/acd space group. The RE{sup 3+}preferentially substitutes on the Yb(1) site which is the smallest volume Yb containing polyhedron. In the case of Ho{sup 3+}, a small amount of Ho{sup 3+} also substitutes on the Yb(4) site. The ferromagnetic ordering temperature of Yb{sub 14}MnSb{sub 11} is reduced from 53 K to 41 K as x increases and dependent on the identity of the RE. This is attributed to the reduction in carriers and reduced screening of the Mn{sup 2+} local moment. The effective moments, μ{sub eff,} agree well with the calculated moments assuming the RE substitutes as a trivalent cation. The largest coercive field is observed for RE = Dy (1000 Oe). For the maximum x of Yb{sub 14−x}RE{sub x}MnSb{sub 11} there are enough carriers for the Ruderman-Kittel-Kasuya-Yosida (RKKY) mechanism of magnetic coupling via conduction electrons to still be valid in describing the ferromagnetic ordering. - Graphical abstract: Field dependent susceptibility loops revealed magnetic remanence in these materials, which hasmore » not been previously observed in Yb{sub 14}MnSb{sub 11} compounds. The coercive field increases with the strength of the paramagnetic moment for the substituting rare earth and the amount of the rare earth that is substituted. Display Omitted - Highlights: • Yb{sub 14−x}RE{sub x}MnSb{sub 11} (RE=Tb, Dy, & Ho) were synthesized with x~0.2 and x~0.4. • Tb, Dy, & Ho preferentially substitute on the Yb(1) site. • Samples with the largest x and largest RE moment have the largest coercive field. • There is a split between zero field cooled and field cooled susceptibility.« less

Authors:
;  [1]; ;  [2];  [1]
  1. Department of Chemistry, University of California, Davis, 95616 CA (United States)
  2. The Institute of Chemistry of the Tajik Academy of Sciences, 229/2, Aini Street, 734063 Dushanbe (Tajikistan)
Publication Date:
OSTI Identifier:
22584136
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Solid State Chemistry; Journal Volume: 238; Other Information: Copyright (c) 2016 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; CATIONS; ELECTRONS; FERROMAGNETISM; HOLMIUM IONS; HYSTERESIS; MANGANESE IONS; MONOCRYSTALS; PARAMAGNETISM; RARE EARTHS; SOLID SOLUTIONS; SOLIDS; SPACE GROUPS; TETRAGONAL LATTICES

Citation Formats

Grebenkemper, Jason H., Hu, Yufei, Abdusalyamova, M.N., Makhmudov, F.A., and Kauzlarich, Susan M. Magnetic remanence in Yb{sub 14−x}RE{sub x}MnSb{sub 11} (RE=Tb, Dy, Ho) single crystals. United States: N. p., 2016. Web. doi:10.1016/J.JSSC.2016.03.037.
Grebenkemper, Jason H., Hu, Yufei, Abdusalyamova, M.N., Makhmudov, F.A., & Kauzlarich, Susan M. Magnetic remanence in Yb{sub 14−x}RE{sub x}MnSb{sub 11} (RE=Tb, Dy, Ho) single crystals. United States. doi:10.1016/J.JSSC.2016.03.037.
Grebenkemper, Jason H., Hu, Yufei, Abdusalyamova, M.N., Makhmudov, F.A., and Kauzlarich, Susan M. 2016. "Magnetic remanence in Yb{sub 14−x}RE{sub x}MnSb{sub 11} (RE=Tb, Dy, Ho) single crystals". United States. doi:10.1016/J.JSSC.2016.03.037.
@article{osti_22584136,
title = {Magnetic remanence in Yb{sub 14−x}RE{sub x}MnSb{sub 11} (RE=Tb, Dy, Ho) single crystals},
author = {Grebenkemper, Jason H. and Hu, Yufei and Abdusalyamova, M.N. and Makhmudov, F.A. and Kauzlarich, Susan M.},
abstractNote = {Single crystals of Yb{sub 14−x}RE{sub x}MnSb{sub 11} (x~0.1, 0.4; RE = Tb, Dy, Ho) have been prepared as a solid solution by Sn flux reactions of the elements. They crystallize in the Ca{sub 14}AlSb{sub 11} structure type in the I4{sub 1}/acd space group. The RE{sup 3+}preferentially substitutes on the Yb(1) site which is the smallest volume Yb containing polyhedron. In the case of Ho{sup 3+}, a small amount of Ho{sup 3+} also substitutes on the Yb(4) site. The ferromagnetic ordering temperature of Yb{sub 14}MnSb{sub 11} is reduced from 53 K to 41 K as x increases and dependent on the identity of the RE. This is attributed to the reduction in carriers and reduced screening of the Mn{sup 2+} local moment. The effective moments, μ{sub eff,} agree well with the calculated moments assuming the RE substitutes as a trivalent cation. The largest coercive field is observed for RE = Dy (1000 Oe). For the maximum x of Yb{sub 14−x}RE{sub x}MnSb{sub 11} there are enough carriers for the Ruderman-Kittel-Kasuya-Yosida (RKKY) mechanism of magnetic coupling via conduction electrons to still be valid in describing the ferromagnetic ordering. - Graphical abstract: Field dependent susceptibility loops revealed magnetic remanence in these materials, which has not been previously observed in Yb{sub 14}MnSb{sub 11} compounds. The coercive field increases with the strength of the paramagnetic moment for the substituting rare earth and the amount of the rare earth that is substituted. Display Omitted - Highlights: • Yb{sub 14−x}RE{sub x}MnSb{sub 11} (RE=Tb, Dy, & Ho) were synthesized with x~0.2 and x~0.4. • Tb, Dy, & Ho preferentially substitute on the Yb(1) site. • Samples with the largest x and largest RE moment have the largest coercive field. • There is a split between zero field cooled and field cooled susceptibility.},
doi = {10.1016/J.JSSC.2016.03.037},
journal = {Journal of Solid State Chemistry},
number = ,
volume = 238,
place = {United States},
year = 2016,
month = 6
}
  • The Hall resistivity, electrical resistivity and magnetization of single crystals of the tetragonal ferromagnet Yb14MnSb11 are reported as a function of the direction of the current, I, and magnetic field, H with respect to the principal crystallographic axes. With I along the unique c direction and H in the a-b plane, the anomalous Hall resistivity in the limit of zero applied field is negative for all temperatures T< Tc= 53 K. An intrinsic Hall conductivity , !xy 0, of -32 "-1 cm-1 is found for T << Tc, which decreases linearly with the spontaneous magnetization (order parameter) as the temperaturemore » is increased to Tc . In this direction, the anomalous Hall effect behaves in a manner similar to that observed in other ferromagnets such as Fe, Co, Mn5Ge3, and EuFe4Sb12. However, with I in the a-b plane and H along the c direction, the anomalous Hall behavior is completely different. The anomalous Hall resistivity data are positive for all T < Tc and a similar analysis of these data fails. In this direction, the anomalous response is not a simple linear function of the magnetization order parameter, and for a fixed temperature (T < Tc) does not depend on the magnitude of the magnetization perpendicular to the current in the a-b plane. That is, when the magnetization and applied field are rotated away from the c direction, the anomalous Hall resistivity does not change. In all other soft ferromagnets that we have examined (including La doped crystals of Yb14MnSb11, i.e. 2 Yb13.3La0.7MnSb11) rotation of the magnetization and magnetic field by an angle # away from a direction perpendicular to I results in a decrease in both the anomalous and normal portions of the Hall resistivity that approximately scales as cos(#). We suggest that the unique response exhibited by Yb14MnSb11 is a direct reflection of the delicate balance between a ferromagnetic and a non-magnetic Kondo lattice ground state« less
  • The large values of remanence observed in isotropic melt-spun R-Fe-Al-B-Si samples have been investigated by correlating the magnetic properties with the microstructure. Transmission electron microscope studies showed that the highest values of reduced remanence m/sub R/ are obtained in samples with very fine Nd/sub 2/Fe/sub 14/B-type grains having a size of about 180 A. The increased reduced remanence can be explained by the large interaction among the magnetic moments of neighboring grains which is caused by the large surface-to-volume ratio of the fine grains.
  • The effect of Co substitution for Fe on the structure and magnetic properties of mechanically milled Nd{sub 8}Fe{sub 88}B{sub 4} has been investigated. As-milled Nd{sub 8}(Fe{sub 1{minus}x}Co{sub x}){sub 88}B{sub 4} (x=0{endash}0.6) alloys exhibited a two-phase mixture consisting of an amorphous phase and a bcc FeCo phase. Optimal annealing of the as-milled samples led to the formation of a nanocrystalline mixture of Nd{sub 2}(FeCo){sub 14}B and a bcc FeCo phase. The optimally annealed samples exhibited single-phase magnetic behavior and remanence enhancement. Replacement of up to 20{percent} of Fe by Co increased both remanence and coercivity. Over substitution of Co and heatmore » treatment at temperatures exceeding 600{degree}C caused the deterioration of both remanence and coercivity. {copyright} {ital 1997 American Institute of Physics.}« less
  • Magnetization approaching absolute magnetic saturation was achieved for polycrystalline holmium metal. At 1.3 ction prod- K and 70.000 gauss, the magnetic moment is approaching 4.0 Bohr magnetons per atom of holmium in contrast to the 10 Bohr magnetons per atom expected on the basis of the spectroscopically determined quantum numbers. The actual results are explained on the basis of crystalline electric field splitting of the ground term of holmium and application of the Pauli exclusion principle. In the liquid belium range, there is a pronounced hysteresis; i.e., the moment at 10,000 gauss is 50% higher in decreasing fields than inmore » increasing fields. The remanence is 0.22 Bohr magneton per atom of holmium at 4.2 ction prod- K and 0.42 Bohr magneton per atom at 1.3 ction prod- K. A sample motion technique was used to measure the magnetic moment of the 5-gram sample. The equipment was calibrated with iron and nickel. (auth)« less