NDLI: High-Temperature Thermoelectric Power of The Metal Oxides: La$_{2−}$ $_{ x }$Sr$_{ x }$CuO$_{4}$ and Bi$_{1−}$ $_{ x }$Sr$_{ x }$MnO$

Content Provider	SpringerLink
Author	Park, Y. W. Kim, B. H. Kim, J. S. Kim, D. C. Kim, Boggi
Copyright Year	2006
Abstract	We have investigated the high-temperature thermoelectric power (TEP) of La$_{2−}$ $_{ x }$Sr$_{ x }$CuO$_{4}$ (0.05 ≤ x ≤ 0.35) and Bi$_{1−}$ $_{ x }$Sr$_{ x }$MnO$_{3}$ (0.5 ≤ x ≤ 0.8) up to 700 K. Based on the TEP results we have discussed the phase transitions on each case. In the case of high-T $_{C}$ cuprates, La$_{2−}$ $_{ x }$Sr$_{ x }$CuO$_{4}$ (0.05 ≤ x ≤ 0.35), the TEP shows different temperature dependences in three temperature regions. At low temperature, the positive TEP rises showing a broad peak at temperature T $_{P}$, which shifts to lower temperature upon Sr doping. Right above T $_{P}$, the TEP decreases linearly as temperature increases. At high temperature, TEP deviates from the linear-T dependence at a certain temperature, T $_{H}$, showing a saturation behavior. The systematic change of the TEP behavior is discussed in terms of the two-fluids model, which is an intrinsically inhomogeneous state, consisted of bound pairs and independent carriers in the normal state of the high-T $_{C}$ superconductors. For Bi$_{1−}$ $_{ x }$Sr$_{ x }$MnO$_{3}$ (0.5 ≤ x ≤ 0.8), the negative TEP is almost temperature-independent in the high temperature regime (T $_{CO}$ < T < 700 K). Near the charge ordering temperature (T $_{CO}$), however, TEP suddenly decreases with decrease of temperature, indicating the suppression of carrier mobility with charge ordering transition. As Bi concentration decreases, T $_{CO}$ shifts to lower temperature from T $_{CO}$ ∼ 520 K for x = 0.5 to T $_{CO}$ ∼ 435 K for x = 0.8, which suggests that charge ordering is related to the local lattice distortion due to highly polarizable 6s$^{2}$ character of Bi$^{3+}$ ion. In comparison with the resistivity data, the TEP results have been discussed in terms of the carrier localization accompanied by local lattice distortion.
Starting Page	743
Ending Page	748
Page Count	6
File Format	PDF
ISSN	08961107
Journal	Journal of Superconductivity and Novel Magnetism
Volume Number	18
Issue Number	5-6
e-ISSN	15729605
Language	English
Publisher	Kluwer Academic Publishers-Plenum Publishers
Publisher Date	2006-01-10
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	Strongly Correlated Systems, Superconductivity Magnetism, Magnetic Materials Condensed Matter Physics Characterization and Evaluation of Materials
Content Type	Text
Resource Type	Article

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