Magnetotransport, thermoelectric power, thermal conductivity and specific heat of Pr2/3Sr1/3MnO3 manganite
| Autor: | Ashok Rao, Y. K. Kuo, W. K. Syu, Ratnakar Singh, Netram Kaurav, Neeraj Panwar, S. K. Agarwal |
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| Rok vydání: | 2008 |
| Předmět: |
Condensed Matter::Materials Science
Phase transition Magnetization Materials science Thermal conductivity Ferromagnetism Condensed matter physics Magnetoresistance Seebeck coefficient Transition temperature General Physics and Astronomy Curie temperature Condensed Matter::Strongly Correlated Electrons |
| Zdroj: | Journal of Applied Physics. 104:083906 |
| ISSN: | 1089-7550 0021-8979 |
| DOI: | 10.1063/1.2992521 |
| Popis: | Magnetotransport and thermal studies of Pr2/3Sr1/3MnO3 polycrystalline sintered bulk sample are reported here. The resistivity ρ(T) and thermoelectric power S(T) data show an insulator to metal (I-M) phase transition at TP≈294 K and TS≈290 K, respectively. Magnetization measurement confirms that the sample undergoes a transition from paramagnetic to ferromagnetic phase at a defined Curie temperature TC=280 K. A substantial increase in magnetoresistance from 2.5% at 280 K to 5% at 77 K has been noticed in a low magnetic field 0.15 T. Small polaron hopping model is found to be operative above the transition temperature TP, whereas electron-electron and electron-magnon scattering processes govern the low temperature metallic behavior. A detailed analysis of thermoelectric power in the ferromagnetic regime suggests that the complicated temperature dependence of S may be understood on the basis of electron-magnon scattering. A transition from decreasing high temperature thermal conductivity (due to local anhar... |
| Databáze: | OpenAIRE |
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