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23 April 2024 |
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Resistivity and Thermoelectric power of NaxCoO2 (x =1.0, 0.7 and 0.6) system | | H. Kishan
; V.P.S. Awana
; M.A. Ansari
; Anurag Gupta
; R.B. Saxena
; V. Ganesan
; A.V. Narlikar
; C. A. Cardoso
; R. Nirmala
; Devendra Buddhikot
; S.K. Malik
; | | Date: |
6 Dec 2004 | | Subject: | Strongly Correlated Electrons; Superconductivity | cond-mat.str-el cond-mat.supr-con | | Affiliation: | NPL, New Delhi, India) V. Ganesan and A.V. Narlikar (IUC, Indore, INDIA), C. A. Cardoso (Univ. Maryland USA), R. Nirmala, Devendra Buddhikot and S.K. Malik (TIFR, Mumbai, India | | Abstract: | Results of thermo-electric power (S) and electrical resistivity (r) measurements are reported on NaxCoO2 compounds with x = 1.0, 0.7 and 0.6. These are single-phase compounds crystallizing in the hexagonal structure (space group P63/mmc) at room temperature. Thermo-electric power values at 300K (S300K) are, 80mV/K, 39mV/K and 37mV/K for x = 1.0, 0.7 and 0.6 samples, respectively. The samples with x=0.7 and 1.0 are metallic down to 5 K, while the x = 0.6 sample is semiconducting. The value of r300K for x = 1.0 sample is ~0.895 mW-cm and the power factor (S2/r) is = 7.04 x 10-3 W/mK2 which qualifies it as a good thermo-electric material. In x =1.0 sample, S(T) is positive throughout 300-5K temperature range and decreases monotonically to zero as temperature T= 0. In contrast, S(T) of x = 0.7 and 0.6 samples changes sign and shows negative values between 90 K and 16 K before approaching zero as T = 0. Anomalous S(T) behavior of x = 0.6 and 0.7 samples, which are coincidentally the precursor materials to the reported superconductivity in this class of materials, indicates a dramatic change in the electronic structure of these compounds on lowering the Na content. | | Source: | arXiv, cond-mat/0412122 | | Services: | Forum | Review | PDF | Favorites | |
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