Low Temperature Magnetic Ordering of the Magnetic Ionic Plastic Crystal, Choline[FeCl4]

7th Meeting of the Spanish Neutron Scattering Association

De Pedro, I.^1 ; García-Saiz, A.^1 ; Andreica, D.^2 ; Barquín, L Fernández^1 ; Fernández-Díaz, M.T.^3 ; Blanco, J.A.^4 ; Amato, A.^5 ; Fernández, J Rodríguez^1

CITIMAC, Facultad de Ciencias, Universidad de Cantabria, Santander

39005, Spain^1

Faculty of Physics, Babes-Bolyai University, Cluj-Napoca

400084, Romania^2

Institut Laue-Langevin, BP 156X, Grenoble Cedex

F-38042, France^3

Departamento de Física, Universidad de Oviedo, Oviedo

33007, Spain^4

Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institut, Villigen PSI

5232, Switzerland^5

关键词: Antiferromagnetic orderings;    Calorimetric measurements;    Heat capacity measurements;    Incommensurate magnetic structures;    Magnetic phase transitions;    Muon spin relaxation;    Neutron diffraction data;    Plastic crystals;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/663/1/012012/pdf
DOI  :  10.1088/1742-6596/663/1/012012

来源: IOP

【 摘 要 】

We report on the nature of the low temperature magnetic ordering of a magnetic ionic plastic crystal, Choline[FeCl4]. This investigation was carried out using heat capacity measurements, neutron diffraction experiments and muon spin relaxation (μSR) spectroscopy. The calorimetric measurements show the onset of an unusual magnetic ordering below 4 K with a possible second magnetic phase transition below 2 K. Low temperature neutron diffraction data reveal a three dimensional antiferromagnetic ordering at 2 K compatible with the previous magnetometry results. The analysis of μSR spectra indicates a magnetic phase transition below 2.2 K. At 1.6 K, the analysis of the shape of the μSR spectra suggests the existence of an additional magnetic phase with features of a possible incommensurate magnetic structure.