Origin of the hardness in the monolayer nanographene

Publication date: Available online 26 April 2019Source: Physics Letters AAuthor(s): Yasin Göktürk YıldızAbstractIn this paper, we investigated the lattice distorsion displacement effects (LDDE) on magnetizations versus temperature in a monolayer nanographene (MLNG) by using effective field theory developed by Kaneyoshi. To obtain the LDDE, we used the twinning angle (Θ) of the zigzag edge of the MLNG and obtain the M-T curves for Θ=100-1800 with 10 steps. We find that MLNG has a minimum Curie temperature (TCmin=2.738) for a certain critical twinning angle (ΘCTA=1300) of the zigzag edge of the MLNG. The TC increases (TC>TCmin) as the Θ increases or decreases from the ΘCTA=1300 (both Θ<ΘCTA and at Θ>ΘCTA cases). Since the hardness is directly proportional with the Tc, the hardness of the MLNG increases for both Θ<ΘCTA and at Θ>ΘCTA cases. Thus, the MLNG has a resistance against to the any changing in the ΘCTA. Therefore, we suggest that the origin of the hardness in nanographene is ΘCTA.
Source: Physics Letters A - Category: Physics Source Type: research
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