Pressure effects on spin-lattice coupling of CdCr2S4

G. N.P. Oliveira; A. M. dos Santos; Zheng Gai; G. Halder; J. P. Araújo; A. M.L. Lopes; A. M. Pereira

doi:10.1016/j.jallcom.2017.04.265

Pressure effects on spin-lattice coupling of CdCr₂S₄

G. N.P. Oliveira, A. M. dos Santos, Zheng Gai, G. Halder, J. P. Araújo, A. M.L. Lopes, A. M. Pereira

Research output: Contribution to journal › Article › peer-review

2 Scopus citations

Abstract

Results of DC magnetization and x-ray diffraction measurements under hydrostatic pressure are reported for the CdCr₂S₄ spinel compound. Magnetization measurements were performed in a polycrystalline sample up to 14 kbar in the 20–220 K temperature range. At low applied magnetic fields an anomalous susceptibility behavior, associated to magnetic clusters, persists up to 14 kbar. X-ray synchrotron diffraction spectra acquired under pressure show a strong linear correlation between the variation of lattice parameters under pressure and the variation of the Cr–Cr distance. In contrast, the S-Cr-S angles remain constant. Clearly, the CdCr₂S₄ magnetic properties are strongly sensitive to pressure variations and the Cr local distortions observed in this compound promote a competition between direct antiferromagnetic and super-exchange ferromagnetic interactions within such short-range magnetic clusters.

Original language	English
Pages (from-to)	83-90
Number of pages	8
Journal	Journal of Alloys and Compounds
Volume	715
DOIs	https://doi.org/10.1016/j.jallcom.2017.04.265
State	Published - 2017

Funding

This work was performed within Proj. Nano Oakridge. Research at the Oak Ridge National Laboratory's Spallation Neutron Source and Center for Nanophase Materials Science was sponsored by the Scientific User Facilities Division, Office of Basic Energy Sciences, of the U.S. Department of Energy. The use of the Advanced Photon Source, an Office of Science User Facility operated for the U.S. Department of Energy (DOE) by the Argonne National Laboratory, was supported by the U.S. DOE under contract no. DE-AC02-06CH11357. G.N.P.O. gratefully thank the FCT-Portugal for his FCT Grant SFRH/BD/80112/2011 and projects IF/00686/2014 and CERN/FIS-NUC/0004/2015.

Funders	Funder number
FCT-Portugal
Scientific User Facilities Division
U.S. Department of Energy	DE-AC02-06CH11357
Office of Science
Basic Energy Sciences
Argonne National Laboratory
Oak Ridge National Laboratory
Fundação para a Ciência e a Tecnologia	SFRH/BD/80112/2011, CERN/FIS-NUC/0004/2015, IF/00686/2014

Keywords

Clusters
Crystal structure
Ferroelectrics
Magnetic measurements

Access to Document

10.1016/j.jallcom.2017.04.265

Cite this

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title = "Pressure effects on spin-lattice coupling of CdCr2S4",

abstract = "Results of DC magnetization and x-ray diffraction measurements under hydrostatic pressure are reported for the CdCr2S4 spinel compound. Magnetization measurements were performed in a polycrystalline sample up to 14 kbar in the 20–220 K temperature range. At low applied magnetic fields an anomalous susceptibility behavior, associated to magnetic clusters, persists up to 14 kbar. X-ray synchrotron diffraction spectra acquired under pressure show a strong linear correlation between the variation of lattice parameters under pressure and the variation of the Cr–Cr distance. In contrast, the S-Cr-S angles remain constant. Clearly, the CdCr2S4 magnetic properties are strongly sensitive to pressure variations and the Cr local distortions observed in this compound promote a competition between direct antiferromagnetic and super-exchange ferromagnetic interactions within such short-range magnetic clusters.",

keywords = "Clusters, Crystal structure, Ferroelectrics, Magnetic measurements",

author = "Oliveira, {G. N.P.} and {dos Santos}, {A. M.} and Zheng Gai and G. Halder and Ara{\'u}jo, {J. P.} and Lopes, {A. M.L.} and Pereira, {A. M.}",

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doi = "10.1016/j.jallcom.2017.04.265",

language = "English",

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journal = "Journal of Alloys and Compounds",

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T1 - Pressure effects on spin-lattice coupling of CdCr2S4

AU - Oliveira, G. N.P.

AU - dos Santos, A. M.

AU - Gai, Zheng

AU - Halder, G.

AU - Araújo, J. P.

AU - Lopes, A. M.L.

AU - Pereira, A. M.

PY - 2017

Y1 - 2017

N2 - Results of DC magnetization and x-ray diffraction measurements under hydrostatic pressure are reported for the CdCr2S4 spinel compound. Magnetization measurements were performed in a polycrystalline sample up to 14 kbar in the 20–220 K temperature range. At low applied magnetic fields an anomalous susceptibility behavior, associated to magnetic clusters, persists up to 14 kbar. X-ray synchrotron diffraction spectra acquired under pressure show a strong linear correlation between the variation of lattice parameters under pressure and the variation of the Cr–Cr distance. In contrast, the S-Cr-S angles remain constant. Clearly, the CdCr2S4 magnetic properties are strongly sensitive to pressure variations and the Cr local distortions observed in this compound promote a competition between direct antiferromagnetic and super-exchange ferromagnetic interactions within such short-range magnetic clusters.

AB - Results of DC magnetization and x-ray diffraction measurements under hydrostatic pressure are reported for the CdCr2S4 spinel compound. Magnetization measurements were performed in a polycrystalline sample up to 14 kbar in the 20–220 K temperature range. At low applied magnetic fields an anomalous susceptibility behavior, associated to magnetic clusters, persists up to 14 kbar. X-ray synchrotron diffraction spectra acquired under pressure show a strong linear correlation between the variation of lattice parameters under pressure and the variation of the Cr–Cr distance. In contrast, the S-Cr-S angles remain constant. Clearly, the CdCr2S4 magnetic properties are strongly sensitive to pressure variations and the Cr local distortions observed in this compound promote a competition between direct antiferromagnetic and super-exchange ferromagnetic interactions within such short-range magnetic clusters.

KW - Clusters

KW - Crystal structure

KW - Ferroelectrics

KW - Magnetic measurements

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