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![]() LISUNOV, Konstantin, ARUSHANOV, Ernest, WIZENT, Nadja, WASKE, Anja, WERNER, Johannes, TRISTAN, Neumann, SEKAR, Chinnathambi, KRABBES, Gernot, BEHR, Gunther U., BUCHNER, Bernd B.. Quasi one-dimensional hopping conductivity of the non-stoichiometric spin-ladder CaCu2O3 single crystals. In: Moldavian Journal of the Physical Sciences, 2009, nr. 1(8), pp. 36-40. ISSN 1810-648X. |
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Moldavian Journal of the Physical Sciences | |
Numărul 1(8) / 2009 / ISSN 1810-648X /ISSNe 2537-6365 | |
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Pag. 36-40 | |
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Rezumat | |
Resistivity, ρ (T), of the spin-ladder compound CaCu2O3 is investigated between T ~
100 − 350 K. Both nearest-neighbor hopping, ρ (T) ~ exp (Ea/kT), and variable-range hopping,
ρ (T) ~ exp [(T0/T)3/4
], quasi one-dimensional conductivity mechanisms are observed above
and below T ~ 200 K, respectively. The activation energy Ea and the VRH characteristic temperature T0 exhibit high sensitivity to the cation (Ca, Cu) content, attributable to a corresponding variation of the concentration of intrinsic defects associated with Cu vacancies. On the
other hand, no direct dependence of Ea and T0 on the excess oxygen concentration is found. |
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