Positive magnetic susceptibility in polygonal nanotube tori | Zendy

Ryo Tamura | Zendy; Mitsuhiro Ikuta | Zendy; Toru Hirahara | Zendy; Masaru Tsukada | Zendy

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Positive magnetic susceptibility in polygonal nanotube tori

Author(s) -

Ryo Tamura,

Mitsuhiro Ikuta,

Toru Hirahara,

Masaru Tsukada

Publication year - 2005

Publication title -

physical review b

Language(s) - English

Resource type - Journals

eISSN - 1538-4489

pISSN - 1098-0121

DOI - 10.1103/physrevb.71.045418

Subject(s) - diamagnetism , torus , paramagnetism , magnetic flux , condensed matter physics , magnetic moment , graphite , nanotube , materials science , flux (metallurgy) , carbon nanotube , persistent current , magnetic field , physics , nanotechnology , geometry , superconductivity , mathematics , quantum mechanics , composite material , metallurgy

A type of large paramagnetic persistent current is revealed in polygonal carbon nanotube sCNTd tori through calculation of the persistent current-induced magnetic moment using a tight binding model. Polygonal CNT tori, constructed by apices formed at heptagonal and pentagonal defects on the inner and outer fringes, exhibit paramagnetism related to the semimetallic band structures of the periodic CNT junctions, despite the inherent diamagnetism of graphite. This type of persistent current differs from that originating from metallic band structures, and is caused by both magnetic flux in the inner hole sAharonov-Bohm fluxd and the magnetic flux penetrating the graphite plane directly sdirect fluxd. This magnetic moment is close to that calculated based on the Aharonov-Bohm alone for a cross section that includes the region of direct flux.

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