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Chinese Physics, 2002, Vol. 11(12): 1294-1299    DOI: 10.1088/1009-1963/11/12/314
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES Prev   Next  

Study of ac hopping conductivity on one-dimensional nanometre systems

Xu Hui (徐慧), Song Yi-Pu (宋祎璞)
Department of Applied Physics, Central South University, Changsha 410083, China
Abstract  In this paper, we establish a one-dimensional random nanocrystalline chain model, we derive a new formula of ac electron-phonon-field conductance for electron tunnelling transfer in one-dimensional nanometre systems. By calculating the ac conductivity, the relationship between the electric field, temperature and conductivity is analysed, and the effect of crystalline grain size and distortion of interfacial atoms on the ac conductance is discussed. A characteristic of negative differential dependence of resistance and temperature in the low-temperature region for a nanometre system is found. The ac conductivity increases linearly with rising frequency of the electric field, and it tends to increase as the crystalline grain size increases and to decrease as the distorted degree of interfacial atoms increases.
Keywords:  ac hopping conductivity      nanometre crystalline grain      distortion of interfacial atoms  
Received:  03 June 2002      Revised:  10 August 2002      Accepted manuscript online: 
PACS:  72.20.Ee (Mobility edges; hopping transport)  
  63.22.-m (Phonons or vibrational states in low-dimensional structures and nanoscale materials)  

Cite this article: 

Xu Hui (徐慧), Song Yi-Pu (宋祎璞) Study of ac hopping conductivity on one-dimensional nanometre systems 2002 Chinese Physics 11 1294

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