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	Springer Nature Link
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
Subject	3100/3101 Condensed Matter Physics Electronic, Optical and Magnetic Materials

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