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Proceedings Paper

Thermoelectric power of Pr0.5Sr0.5MnO3 with Ru substitution at the Mn site
Author(s): Jun Sung Kim; Dong Chul Kim; G. C. McIntosh; B. J. Kim; Y. C. Kim; A. Maignan; Bernard Raveau; YungWoo Park
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Paper Abstract

Thermoelectric power(TEP) mesurement has been carried out on the series of Pr0.5Sr0.5Mn1-xRuxO3 (0.0 ≤ x ≤ 0.1) under zero and 6 tesla magnetic fields. In Pr0.5Sr0.5MnO3, a large negative peak of TEP was observed below the ferromagnetic(FM) to antiferromagnetic(AFM) transition temperature, TN ~ 165K. Under H = 6 tesla, the magnitude of the negative TEP peak is slightly reduced with decrease of TN down to 105K. For Mn-site doped samples with Ru, however, the negative TEP peak is drasically suppressed by only 2% of Ru doping and completely disappears with further Ru doping. This indicates that the FM metallic state is induced more strongly by Ru substitution than by the magnetic field. In the paramagnetic(PM) regime above the Curie temperature, TC, it was found that TEP as well as resistivity for Pr0.5Sr0.5Mn1-xRuxO3 can be described by the polaronic transport mechanism. The systematic changes of TEP in the PM regime with variation of Ru concentration is discussed in relation to the effects of Ru doping at Mn sites which extends the FM phase at low temperatures and increases TC similarly to the application of magnetic field.

Paper Details

Date Published: 7 November 2002
PDF: 11 pages
Proc. SPIE 4811, Superconducting and Related Oxides: Physics and Nanoengineering V, (7 November 2002); doi: 10.1117/12.455504
Show Author Affiliations
Jun Sung Kim, Seoul National Univ. (South Korea)
Dong Chul Kim, Seoul National Univ. (South Korea)
G. C. McIntosh, Seoul National Univ. (South Korea)
B. J. Kim, Pusan National Univ. (South Korea)
Y. C. Kim, Pusan National Univ. (South Korea)
A. Maignan, Lab. de Cristallographie et Sciences des Materiaux/ISMRA (France)
Bernard Raveau, Lab. de Cristallographie et Sciences des Materiaux/ISMRA (France)
YungWoo Park, Seoul National Univ. (South Korea)


Published in SPIE Proceedings Vol. 4811:
Superconducting and Related Oxides: Physics and Nanoengineering V
Ivan Bozovic; Davor Pavuna, Editor(s)

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