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Systematics In The Thermopower Behaviour Of Several Series Of Bismuth And Thallium Cuprate Superconductors : An Interpretation Of The Temperature Variation And The Sign Of The Thermopower

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dc.contributor.author Rao, C N R
dc.contributor.author Ramakrishnan, T V
dc.contributor.author Kumar, N
dc.date.accessioned 2012-11-27T10:59:17Z
dc.date.available 2012-11-27T10:59:17Z
dc.date.issued 1990-01-15
dc.identifier 0921-4534 en_US
dc.identifier.citation Physica C 165(2), 183-188 (1990) en_US
dc.identifier.uri https://libjncir.jncasr.ac.in/xmlui/10572/1101
dc.description Restricted Access en_US
dc.description.abstract The thermopower, α, of many members of the Bi2Ca1−xYxSr2Cu2O8+δ, Bi2−yPbyCaSr2Cu2O8 +δ, TlyCa1−xYxBa2Cu2O6+δ, TlCa1−xLnxSr2Cu2O6+δ and TlSr2−xLaxCuO5+δ systems is positive down to Tc, but is negat ive in some of them. The slope of the α-T plots above Tc is generally negative independent of the sign of α. The value of α extrapolated to 0 K, α(0), from the high-tem perature regime is finite and generally, positive. Compared to the behaviour of YBa2Cu3O7, the data on the Bi and Tl cuprate systems examined here seem to suggest that electrons may be involved in the conduction process as well, at least in systems where both the α and the α-T slope are negative. Of the different systems examined here, Tl1−xPbxCaSr2Cu2O6+δ contai ning Pb in the 4+state, deserves special mention since it shows negative α over the entire temperature range in addition to a negative slope suggesting that this is likely to be a genuine high-Tc electron-superconductor. The thermopower of cuprates has been discussed in some detail in terms of entropic and quasiparticle contributions. en_US
dc.description.uri http://dx.doi.org/10.1016/0921-4534(90)90166-C en_US
dc.language.iso en en_US
dc.publisher Elsevier Science BV en_US
dc.rights © 1990 Elsevier Science BV en_US
dc.subject Conduction process en_US
dc.subject Cuprates en_US
dc.subject Different systems en_US
dc.subject Entire temperature range en_US
dc.subject Entropic en_US
dc.subject Genuine high-tc electron-superconductor en_US
dc.subject Negative en_US
dc.subject Negative α en_US
dc.subject Positive en_US
dc.subject Quasiparticle contributions en_US
dc.subject Thermopower en_US
dc.subject Tl cuprate systems en_US
dc.subject Tl1−xpbxcasr2cu2o6+δ contai ning pb en_US
dc.subject Tlsr2−xlaxcuo5+δ systems en_US
dc.subject Α-t slope en_US
dc.title Systematics In The Thermopower Behaviour Of Several Series Of Bismuth And Thallium Cuprate Superconductors : An Interpretation Of The Temperature Variation And The Sign Of The Thermopower en_US
dc.type Article en_US


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