Magnetic and transport properties of RCr{sub 0.3}Ge{sub 2} (R=Tb, Dy, Ho and Er) compounds

Journal Article · Tue Feb 15 00:00:00 EST 2011 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2010.10.026· OSTI ID:21494196

Gil, A ^[1]; Kaczorowski, D ^[2]; Penc, B ^[3]; Hoser, A ^[4]; SzytuLa, A ^[3]

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1. Department of Mathematics and Natural Science, J. DLugosz University Czestochowa, Armii Krajowej 13/15, 42-200 Czestochowa (Poland)
2. Institute of Low Temperature and Structure Research, Polish Academy of Sciences, P.O. Box 1410, 50-950 WrocLaw (Poland)
3. M. Smoluchowski Institute of Physics, Jagiellonian University, Reymonta 4, 30-059 Krakow (Poland)
4. BENSC, Helmholtz-Zentrum Berlin, Glienicker Str. 100, 14-109 Berlin (Germany)

The magnetic and transport properties of ternary rare-earth chromium germanides RCr{sub 0.3}Ge{sub 2} (R=Y and Tb-Er) have been determined. X-ray and neutron diffraction studies indicate that these compounds have the CeNiSi{sub 2}-type structure (space group Cmcm) . Magnetic measurements reveal the antiferromagnetic ordering below T{sub N} equal to 18.5 K (R=Tb), 11.8 K (Dy), 5.8 K (Ho) and 3.4 K (Er). From the neutron diffraction data the magnetic structures have been determined. For TbCr{sub 0.3}Ge{sub 2} and DyCr{sub 0.3}Ge{sub 2} at low temperatures the magnetic ordering can be described by two vectors k{sub 1}=(1/2 ,0,0) and k{sub 2}=(1/4 ,0,1/4), and k{sub 1}'=(1/2 ,0,0) and k{sub 2}'=(1/2 ,0,1/2), respectively. In HoCr{sub 0.3}Ge{sub 2} and ErCr{sub 0.3}Ge{sub 2} the ordering can be described by one propagation vector equal to (1/2 ,1/2 ,0) and (0,0,0.4187(2)), respectively. In DyCr{sub 0.3}Ge{sub 2} some change in the magnetic ordering is observed at T{sub t}=5.1 K. In temperature range from T{sub t} to T{sub N} the magnetic ordering is given by one propagation vector k=(1/2 ,0,0). YCr{sub 0.3}Ge{sub 2} is a Pauli paramagnet down to 1.72 K which suggests that in the entire RCr{sub 0.3}Ge{sub 2} series the Cr atoms do not carry magnetic moments. All compounds studied exhibit metallic character of the electrical conductivity. The temperature dependencies of the lattice parameters reveal strong magnetostriction effect at the respective Neel temperatures. -- Graphical abstract: In the neutron diffraction pattern of TbCr{sub 0.3}Ge{sub 2} compound collected at 1.5 K the additional peaks of magnetic origin form two groups. The first one, with strong intensities, can be indexed by the propagation vector k=(1/2 ,0,0) (a), while the second one, with small intensities, can be described by the propagation vector k=(1/4 ,0,1/4) (b). The analysis of the magnetic peak intensities indicates that the Tb magnetic moments located at the positions Tb1 (0,y,1/4), Tb2 (0,-y,3/4), Tb3 (1/2 ,1/2 +y,1/4) and Tb4 (1/2 ,1/2 -y,3/4) form a collinear structure with the (+ + - -) sequence in the crystallographic unit cell for the first component and (- + + -) for the second. Display Omitted

• OSTI ID: 21494196
• Journal Information: Journal of Solid State Chemistry, Vol. 184, Issue 2; Other Information: DOI: 10.1016/j.jssc.2010.10.026; PII: S0022-4596(10)00483-4; Copyright (c) 2010 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; ISSN 0022-4596
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ANTIFERROMAGNETISM
CHROMIUM COMPOUNDS
CRYSTALLOGRAPHY
DYSPROSIUM COMPOUNDS
ELECTRIC CONDUCTIVITY
ERBIUM COMPOUNDS
GERMANIDES
HOLMIUM COMPOUNDS
LATTICE PARAMETERS
MAGNETIC MOMENTS
MAGNETIZATION
MAGNETOSTRICTION
NEEL TEMPERATURE
NEUTRON DIFFRACTION
ORTHORHOMBIC LATTICES
SPACE GROUPS
TERBIUM COMPOUNDS
VECTORS
X-RAY DIFFRACTION
COHERENT SCATTERING
CRYSTAL LATTICES
CRYSTAL STRUCTURE
DIFFRACTION
ELECTRICAL PROPERTIES
GERMANIUM COMPOUNDS
MAGNETIC PROPERTIES
MAGNETISM
PHYSICAL PROPERTIES
RARE EARTH COMPOUNDS
SCATTERING
SYMMETRY GROUPS
TENSORS
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE