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Unusual butterfly-shaped magnetization signals and spin-glass-like behaviour in highly oriented pyrolytic graphite

Taallah, Ayoub, Wen, Jiqiu, Wang, Shanling, Grasso, Salvatore, He, Yi, Xia, JiaChen, Shuai, Gao, Odunmbaku, Omololu, Corrias, Anna, Boi, Filippo S. and others. (2020) Unusual butterfly-shaped magnetization signals and spin-glass-like behaviour in highly oriented pyrolytic graphite. Carbon, . ISSN 0008-6223. (In press) (doi:10.1016/j.carbon.2020.05.104) (Access to this publication is currently restricted. You may be able to access a copy if URLs are provided) (KAR id:81476)

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We report a novel investigation on the relationship between magnetic-ordering and graphitic-structure in highly-oriented-pyrolytic-graphite (HOPG). By employing orientation-dependent-X-ray-diffraction, Raman-spectroscopy and temperature-dependent-superconductive-quantum-interference-device (T-SQUID) we examined the presence of ferromagnetic- and superconductive-ordering in HOPG systems with 1) disordered (HOPG1, containing carbon-vacancy-rich weak-Bernal-stacking and Moiré-superlattices with θmisfit ∼ 0.5°) and 2) ordered (HOPG2, containing higher-degree of Bernal-stacking and Moiré-superlattices with θmisfit ∼ 0.5°, 0.8°, 11°) graphitic-layer-arrangement. A perfect-HOPG is expected to exhibit a diamagnetic-response to an applied-magnetic-field. Instead, additional 1) ferromagnetic-signals presenting a characteristic width-enhancement with the field increasing in HOPG1 and 2) complex butterfly-shaped ferromagnetic signals in HOPG2, are demonstrated. Temperature-dependent-magnetometry evidenced further the presence of randomly oriented ferromagnetic clusters originating from topological disorder in both HOPG1 and HOPG2. These magnetic signals were explained on the basis of the percolative-type model.

Item Type: Article
DOI/Identification number: 10.1016/j.carbon.2020.05.104
Subjects: Q Science
Divisions: Faculties > Sciences > School of Physical Sciences
Depositing User: Anna Corrias
Date Deposited: 01 Jun 2020 13:33 UTC
Last Modified: 02 Jun 2020 09:10 UTC
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