Separating the ferromagnetic and glassy behavior within the metal-organic magnet Ni(TCNQ)2

Berlie, A.; Terry, I.; Szablewski, M.; Giblin, S.R.

doi:10.1103/physrevb.92.184431

Separating the ferromagnetic and glassy behavior within the metal-organic magnet Ni(TCNQ)2

Berlie, A.; Terry, I.; Szablewski, M.; Giblin, S.R.

Authors

A. Berlie

Dr Ian Terry ian.terry@durham.ac.uk
Associate Professor

Professor Marek Szablewski marek.szablewski@durham.ac.uk
Professor

S.R. Giblin

Abstract

An in-depth study of the metal-organic magnet Ni(TCNQ)2 was conducted where the deuterated form was synthesised both to attempt to alter the magnetic properties of the material and to be advantageous in techniques such as neutron scattering and muon spectroscopy. Deuteration saw a 3 K increase in TC with magnetization and heat capacity measurements demonstrating a spin wave contribution at low temperatures confirming the 3D nature of the ferromagnetic state shown by Ni(TCNQ−D4)2. AC susceptibility results suggest there is a glassy component associated with the magnetically ordered state, though muon spectroscopy measurements did not support the presence of a spin glass state. Instead muon spectroscopy at zero magnetic field indicated the presence of two magnetic transitions, one at 20 K and another below 6 K; the latter is likely due to the system entering a quasistatic regime, similar to what one might expect of a superspin or cluster glass. Neutron diffraction measurements further supported this by revealing very weak magnetic Bragg peaks suggesting that the magnetism may have a short coherence length and be confined to small grains or clusters. The separation of the ferromagnetic and glassy magnetic components of the material's properties suggest that this system may show promise as a metal-organic magnet which is easily modified to change its magnetic properties, providing larger grain sizes can be synthesized.

Citation

Berlie, A., Terry, I., Szablewski, M., & Giblin, S. (2015). Separating the ferromagnetic and glassy behavior within the metal-organic magnet Ni(TCNQ)2. Physical review B, 92(18), Article 184431. https://doi.org/10.1103/physrevb.92.184431

Journal Article Type	Article
Acceptance Date	Oct 15, 2015
Online Publication Date	Nov 30, 2015
Publication Date	Nov 30, 2015
Deposit Date	Dec 1, 2015
Publicly Available Date	Dec 4, 2015
Journal	Physical Review B
Print ISSN	1098-0121
Electronic ISSN	1550-235X
Publisher	American Physical Society
Peer Reviewed	Peer Reviewed
Volume	92
Issue	18
Article Number	184431
DOI	https://doi.org/10.1103/physrevb.92.184431

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