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Title: Pressure effects on spin-lattice coupling of CdCr 2 S 4

Authors:
; ; ; ; ; ; ORCiD logo
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1397658
Grant/Contract Number:
AC02-06CH11357; SFRH/BD/80112/2011; IF/00686/2014; CERN/FIS-NUC/0004/2015
Resource Type:
Journal Article: Publisher's Accepted Manuscript
Journal Name:
Journal of Alloys and Compounds
Additional Journal Information:
Journal Volume: 715; Journal Issue: C; Related Information: CHORUS Timestamp: 2017-10-04 21:34:21; Journal ID: ISSN 0925-8388
Publisher:
Elsevier
Country of Publication:
Netherlands
Language:
English

Citation Formats

Oliveira, G. N. P., dos Santos, A. M., Gai, Zheng, Halder, G., Araújo, J. P., Lopes, A. M. L., and Pereira, A. M.. Pressure effects on spin-lattice coupling of CdCr 2 S 4. Netherlands: N. p., 2017. Web. doi:10.1016/j.jallcom.2017.04.265.
Oliveira, G. N. P., dos Santos, A. M., Gai, Zheng, Halder, G., Araújo, J. P., Lopes, A. M. L., & Pereira, A. M.. Pressure effects on spin-lattice coupling of CdCr 2 S 4. Netherlands. doi:10.1016/j.jallcom.2017.04.265.
Oliveira, G. N. P., dos Santos, A. M., Gai, Zheng, Halder, G., Araújo, J. P., Lopes, A. M. L., and Pereira, A. M.. 2017. "Pressure effects on spin-lattice coupling of CdCr 2 S 4". Netherlands. doi:10.1016/j.jallcom.2017.04.265.
@article{osti_1397658,
title = {Pressure effects on spin-lattice coupling of CdCr 2 S 4},
author = {Oliveira, G. N. P. and dos Santos, A. M. and Gai, Zheng and Halder, G. and Araújo, J. P. and Lopes, A. M. L. and Pereira, A. M.},
abstractNote = {},
doi = {10.1016/j.jallcom.2017.04.265},
journal = {Journal of Alloys and Compounds},
number = C,
volume = 715,
place = {Netherlands},
year = 2017,
month = 8
}

Journal Article:
Free Publicly Available Full Text
This content will become publicly available on May 3, 2018
Publisher's Accepted Manuscript

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  • Interplay between structural disorder and magnetic interaction is investigated here for a multiferroic candidate material, CdCr{sub 2}Se{sub 4}. Ferromagnetic order in CdCr{sub 2}Se{sub 4} sets in below T{sub C} ∼ 130 K as a result of competition between the direct Cr-Cr spin coupling and the near neighbour Cr-Se-Cr exchange interactions. Hence, a small change in the crystal structure is expected to drastically affect its magnetic order. In this report, local lattice distortions within the overall cubic symmetry were brought about by replacing a small percentage of Se by isovalent S. Detailed crystal structure study using EXAFS and Raman Spectroscopy reflects the presence ofmore » local distortions within the overall cubic symmetry. Contrary to the expectation, magnetic properties of the substituted compositions do not show any drastic changes. Though, a signature of spin-phonon coupling is present across the magnetic ordering temperature. No structural phase transition occurs within the investigated temperature range of 80–300 K.« less
  • Using the time dependence of high-frequency permeability in strong pulsed electric fields, we investigated the heating of a spin system by drifting current carriers in CdCr/sub 2/Se/sub 4/ and EuO. Both overheating and underheating of the spin system with respect to the lattice were observed.
  • The decrease of the magnetization and of the electric conductivity of the magnetic semiconductors EuO and CdCr/sub 2/Se/sub 4/ in a strong electric field, due to spin-wave excitation by the carriers, is investigated.
  • We present a theoretical investigation of the electronic and magnetic structure of spinel CdCr{sub 2}Te{sub 4} using density functional theory, its extensions via onsite Hubbard U interactions, and a screened-hybrid-functional exchange potential. We find that the ground state is semiconducting within the latter approach, and within this magnetic-semiconducting system, we compute the complex band structure, finding a slowly decaying evanescent Δ{sup ~}{sub 1} state possibly suitable for realizing a spin-dependent symmetry filter effect.