Revisiting the properties of delafossite CuCrO{sub 2}: A single crystal study
- Laboratoire CRISMAT, UMR 6508 CNRS, ENSICAEN, 6 Bd. du Marechal Juin, 14050 Caen Cedex (France)
- Laboratoire Leon Brillouin, CEA-CNRS UMR12, CEA-Saclay, 91191 Gif-sur-Yvette Cedex (France)
Platelet-like single-crystals of delafossite CuCrO{sub 2} have been successfully grown and characterised by X-ray diffraction and pole figures, scanning electron and atomic force microscopy. Transport measurements reveal that the resistivity is highly anisotropic, with a ratio of about 35 at 300 K between the in- and out-of-plane directions, reflecting the layered crystal structure. The magnetization and specific heat data show that CuCrO{sub 2} undergoes a unique antiferromagnetic transition at T{sub N}=24.0 K, in contrast to a recent report on CuCrO{sub 2} single-crystals showing the existence of two magnetic transitions, T{sub N1}=24.2 K and T{sub N2}=23.6 K, depending on the orientation of the applied magnetic field along and perpendicular to c, respectively. - Graphical abstract: 3R-CuCrO{sub 2} platelet-like single crystals have been successfully grown by the flux method. As revealed by {chi}(T) and C(T) measurements, their properties are characterised by a unique antiferromagnetic transition at T{sub N}=24 K. Interestingly, despite a very small magnetic anisotropy, a large one is evidenced by the resistivity ratio, {rho}{sub c}/{rho}{sub ab}{approx}35, at 300 K. This suggests an easier charge hopping in the [CrO{sub 2}] planes rather than along (Cr-O-Cu) pathways, i.e. along c axis. Highlights: Black-Right-Pointing-Pointer R-CuCrO{sub 2} plate-like single crystals have been synthesised by the flux method. Black-Right-Pointing-Pointer Growth takes place layer-by-layer and some growth defects have been observed. Black-Right-Pointing-Pointer CuCrO{sub 2} single crystals exhibit a unique antiferromagnetic transition at T{sub N}=24 K. Black-Right-Pointing-Pointer Transport measurements reveal that the resistivity is highly anisotropic.
- OSTI ID:
- 21612850
- Journal Information:
- Journal of Solid State Chemistry, Vol. 185; Other Information: DOI: 10.1016/j.jssc.2011.10.047; PII: S0022-4596(11)00589-5; Copyright (c) 2011 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 0022-4596
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
ANISOTROPY
ANTIFERROMAGNETISM
ATOMIC FORCE MICROSCOPY
CHROMIUM OXIDES
DEFECTS
ELECTRICAL PROPERTIES
ELECTRON SCANNING
LAYERS
MAGNETIC FIELDS
MAGNETIC PROPERTIES
MONOCRYSTALS
MORPHOLOGY
SPECIFIC HEAT
X-RAY DIFFRACTION
CHALCOGENIDES
CHROMIUM COMPOUNDS
COHERENT SCATTERING
CRYSTALS
DIFFRACTION
MAGNETISM
MICROSCOPY
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SCATTERING
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS