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Title: Neutron diffraction studies of RSn{sub 1+x}Ge{sub 1-x} (R=Tb-Er) compounds

Abstract

The magnetic structures of RSn{sub 1+x}Ge{sub 1-x} (R=Tb, Dy, Ho and Er, x{approx}0.1) compounds have been determined by neutron diffraction studies on polycrystalline samples. The data recorded in a paramagnetic state confirmed the orthorhombic crystal structure described by the space group Cmcm. These compounds are antiferromagnets at low temperatures. The magnetic ordering in TbSn{sub 1.12}Ge{sub 0.88} is sine-modulated described by the propagation vector k=(0.4257(2), 0, 0.5880(3)). Tb magnetic moment equals 9.0(1) {mu}{sub B} at 1.62 K. It lies in the b-c plane and form an angle {theta}=17.4(2) deg. with the c-axis. This structure is stable up to the Neel temperature equal to 31 K. The magnetic structures of RSn{sub 1+x}Ge{sub 1-x}, where R are Dy, Ho and Er at low temperatures are described by the propagation vector k=(1/2, 1/2, 0) with the sequence (++-+) of magnetic moments in the crystal unit cell. In DySn{sub 1.09}Ge{sub 0.91} and HoSn{sub 1.1}Ge{sub 0.9} magnetic moments equal 7.25(15) and 8.60(6) {mu}{sub B} at 1.55 K, respectively. The moments are parallel to the c-axis. For Ho-compound this ordering is stable up to T{sub N}=10.7 K. For ErSn{sub 1.08}Ge{sub 0.92}, the Er magnetic moment equals 7.76(7) {mu}{sub B} at T=1.5 K and it is parallel tomore » the b-axis. At T{sub t}=3.5 K it tunes into the modulated structure described by the k=(0.496(1), 0.446(4), 0). With the increase of temperature there is a slow decrease of k{sub x} component and a quick decrease of k{sub y} component. The Er magnetic moment is parallel to the b-axis up to 3.9 K while at 4 K and above it lies in the b-c plane and form an angle 48(3) deg. with the c-axis. In compounds with R=Tb, Ho and Er the magnetostriction effect at the Neel temperature is observed. - Graphical abstract: The magnetic structures of RSn{sub 1+x}Ge{sub 1-x} (R=Tb, Dy, Ho and Er, x{approx}0.1) compounds have been determined by neutron diffraction studies on polycrystalline samples. The magnetic ordering in TbSn{sub 1.12}Ge{sub 0.88} (a) is sine-modulated described by the propagation vector k=(0.426, 0, 0.588). The magnetic structures of RSn{sub 1+x}Ge{sub 1-x} where R are Dy (b), Ho (b) and Er (c) at temperatures close to 1.5 K are described by the propagation vector k=(1/2, 1/2, 0) with the sequence (++-+) of magnetic moments in the crystal unit cell. For Ho- and Dy-compound this ordering is stable up to T{sub N} while for Er-compound at T{sub t}=3.5 K it tunes into a modulated structure (d). Highlights: > We determine crystal and magnetic structures of RSn{sub 1+x}Ge{sub 1-x} (R=Tb, Dy, Ho, Er, x{approx}0.1) compounds. > We compare the results with those for RT{sub x}X{sub 2} (X=Ge, Sn) compounds. > We examine the influence of other components (T, Sn, Ge) on magnetic ordering in R-sublattices. > Magnetic ordering in RSn{sub 1+x}Ge{sub 1-x} compounds is similar to those observed in RT{sub x}X{sub 2} compounds. > Other elements (T, Sn, Ge) have not got significant influence on stability of magnetic ordering.« less

Authors:
 [1]; ;  [2];  [3];  [2]
  1. Department of Mathematics and Natural Sciences, J. Dlugosz University Czestochowa, Armii Krajowej 13/15, PL 42-200 Czestochowa (Poland)
  2. M. Smoluchowski Institute of Physics, Jagiellonian University, Reymonta 4, PL 30-059 Krakow (Poland)
  3. BENSC, Helmholtz-Zentrum Berlin, Hahn-Meitner-Platz 1, D 14109 Berlin (Germany)
Publication Date:
OSTI Identifier:
21580165
Resource Type:
Journal Article
Journal Name:
Journal of Solid State Chemistry
Additional Journal Information:
Journal Volume: 184; Journal Issue: 7; Other Information: DOI: 10.1016/j.jssc.2011.04.040; PII: S0022-4596(11)00221-0; Copyright (c) 2011 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Journal ID: ISSN 0022-4596
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; DYSPROSIUM COMPOUNDS; ERBIUM COMPOUNDS; HOLMIUM COMPOUNDS; INDIUM COMPOUNDS; INTERMETALLIC COMPOUNDS; MAGNETIC MOMENTS; MAGNETIZATION; MAGNETOSTRICTION; NEEL TEMPERATURE; NEUTRON DIFFRACTION; ORTHORHOMBIC LATTICES; PARAMAGNETISM; POLYCRYSTALS; RARE EARTHS; SPACE GROUPS; STABILITY; TEMPERATURE RANGE 0065-0273 K; TIN COMPOUNDS; VECTORS; ALLOYS; COHERENT SCATTERING; CRYSTAL LATTICES; CRYSTAL STRUCTURE; CRYSTALS; DIFFRACTION; ELEMENTS; MAGNETIC PROPERTIES; MAGNETISM; METALS; PHYSICAL PROPERTIES; RARE EARTH COMPOUNDS; SCATTERING; SYMMETRY GROUPS; TEMPERATURE RANGE; TENSORS; THERMODYNAMIC PROPERTIES; TRANSITION TEMPERATURE

Citation Formats

Gil, A., E-mail: a.gil@ajd.czest.pl, Penc, B., Baran, S., Hoser, A., and Szytula, A.. Neutron diffraction studies of RSn{sub 1+x}Ge{sub 1-x} (R=Tb-Er) compounds. United States: N. p., 2011. Web. doi:10.1016/j.jssc.2011.04.040.
Gil, A., E-mail: a.gil@ajd.czest.pl, Penc, B., Baran, S., Hoser, A., & Szytula, A.. Neutron diffraction studies of RSn{sub 1+x}Ge{sub 1-x} (R=Tb-Er) compounds. United States. doi:10.1016/j.jssc.2011.04.040.
Gil, A., E-mail: a.gil@ajd.czest.pl, Penc, B., Baran, S., Hoser, A., and Szytula, A.. Fri . "Neutron diffraction studies of RSn{sub 1+x}Ge{sub 1-x} (R=Tb-Er) compounds". United States. doi:10.1016/j.jssc.2011.04.040.
@article{osti_21580165,
title = {Neutron diffraction studies of RSn{sub 1+x}Ge{sub 1-x} (R=Tb-Er) compounds},
author = {Gil, A., E-mail: a.gil@ajd.czest.pl and Penc, B. and Baran, S. and Hoser, A. and Szytula, A.},
abstractNote = {The magnetic structures of RSn{sub 1+x}Ge{sub 1-x} (R=Tb, Dy, Ho and Er, x{approx}0.1) compounds have been determined by neutron diffraction studies on polycrystalline samples. The data recorded in a paramagnetic state confirmed the orthorhombic crystal structure described by the space group Cmcm. These compounds are antiferromagnets at low temperatures. The magnetic ordering in TbSn{sub 1.12}Ge{sub 0.88} is sine-modulated described by the propagation vector k=(0.4257(2), 0, 0.5880(3)). Tb magnetic moment equals 9.0(1) {mu}{sub B} at 1.62 K. It lies in the b-c plane and form an angle {theta}=17.4(2) deg. with the c-axis. This structure is stable up to the Neel temperature equal to 31 K. The magnetic structures of RSn{sub 1+x}Ge{sub 1-x}, where R are Dy, Ho and Er at low temperatures are described by the propagation vector k=(1/2, 1/2, 0) with the sequence (++-+) of magnetic moments in the crystal unit cell. In DySn{sub 1.09}Ge{sub 0.91} and HoSn{sub 1.1}Ge{sub 0.9} magnetic moments equal 7.25(15) and 8.60(6) {mu}{sub B} at 1.55 K, respectively. The moments are parallel to the c-axis. For Ho-compound this ordering is stable up to T{sub N}=10.7 K. For ErSn{sub 1.08}Ge{sub 0.92}, the Er magnetic moment equals 7.76(7) {mu}{sub B} at T=1.5 K and it is parallel to the b-axis. At T{sub t}=3.5 K it tunes into the modulated structure described by the k=(0.496(1), 0.446(4), 0). With the increase of temperature there is a slow decrease of k{sub x} component and a quick decrease of k{sub y} component. The Er magnetic moment is parallel to the b-axis up to 3.9 K while at 4 K and above it lies in the b-c plane and form an angle 48(3) deg. with the c-axis. In compounds with R=Tb, Ho and Er the magnetostriction effect at the Neel temperature is observed. - Graphical abstract: The magnetic structures of RSn{sub 1+x}Ge{sub 1-x} (R=Tb, Dy, Ho and Er, x{approx}0.1) compounds have been determined by neutron diffraction studies on polycrystalline samples. The magnetic ordering in TbSn{sub 1.12}Ge{sub 0.88} (a) is sine-modulated described by the propagation vector k=(0.426, 0, 0.588). The magnetic structures of RSn{sub 1+x}Ge{sub 1-x} where R are Dy (b), Ho (b) and Er (c) at temperatures close to 1.5 K are described by the propagation vector k=(1/2, 1/2, 0) with the sequence (++-+) of magnetic moments in the crystal unit cell. For Ho- and Dy-compound this ordering is stable up to T{sub N} while for Er-compound at T{sub t}=3.5 K it tunes into a modulated structure (d). Highlights: > We determine crystal and magnetic structures of RSn{sub 1+x}Ge{sub 1-x} (R=Tb, Dy, Ho, Er, x{approx}0.1) compounds. > We compare the results with those for RT{sub x}X{sub 2} (X=Ge, Sn) compounds. > We examine the influence of other components (T, Sn, Ge) on magnetic ordering in R-sublattices. > Magnetic ordering in RSn{sub 1+x}Ge{sub 1-x} compounds is similar to those observed in RT{sub x}X{sub 2} compounds. > Other elements (T, Sn, Ge) have not got significant influence on stability of magnetic ordering.},
doi = {10.1016/j.jssc.2011.04.040},
journal = {Journal of Solid State Chemistry},
issn = {0022-4596},
number = 7,
volume = 184,
place = {United States},
year = {2011},
month = {7}
}