Quasi one-dimensional hopping conductivity of the non-stoichiometric spin-ladder CaCu2O3 single crystals

Lisunov Konstantin; Arushanov Ernest; Wizent Nadja; Waske Anja; Werner Johannes; Tristan Neumann; Sekar Chinnathambi; Krabbes Gernot; Behr Gunther U.; Buchner Bernd B.

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2020-10-18 21:35

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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

Quasi one-dimensional hopping conductivity of the non-stoichiometric spin-ladder CaCu₂O₃ single crystals

Pag. 36-40

Lisunov Konstantin¹, Arushanov Ernest¹², Wizent Nadja³, Waske Anja³, Werner Johannes³, Tristan Neumann³, Sekar Chinnathambi³, Krabbes Gernot³, Behr Gunther U.³, Buchner Bernd B.³

¹ Institute of Applied Physics, Academy of Sciences of Moldova,
² Leibniz Institute for Solid State and Materials Reseach, Dresden,
³ Institut fuer Integrative Nanowissenschaften, Leibniz-Institut fuer Festkoerper- und Werkstoffforschung Dresden

Disponibil în IBN: 14 decembrie 2013

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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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<title xml:lang='en'>Quasi one-dimensional hopping conductivity of the non-stoichiometric spin-ladder CaCu2O3 single crystals</title>
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<description xml:lang='en' descriptionType='Abstract'>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. </description>
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