La,.i7Ca"24SroixMn03 single crystals with high quali^r' have been prepared by using floaling /one technique. The slniclural, Iransport. magnelic and tliennal properlies of Ihe hole doped Lafl7Ca,j,24Sr",0(5MnO3 single crystal, liave been studied using various experimental lecluuques. The resistivitj^ data shows tlie metal to insulator transition (Ml) occurs at T^^n = 281 K along tlic c-axis and TMT = 270 K along tlic rtft-planc. It is observed that the T^,^ data is higher along the c-;ixis as compared to that in the ofi-plane. thus indicating more fa\'ourdble hoping of electrons is along the c-axis. Tliis MI transition and large magnetoresistance peak 79 % is closely near to the ferromagnetic -paramagnetic transition T^. wliich was confimied from the magnetization data (at -275 K). it was also confimied from the ac susceptibilitj" data (at -275 K) and Ihe specific heal data (at -270 K), wliich in tenn is indicali\e of Uie onset of long range order. The enlropy change associated with this Iransilion is found to be 2,3 J/niol K, For bolometric applications point of view, the temperature coefficient of resistance (TCR) along abplaneisfound-23%K'.
We report the transport, magnetic, and thermal properties of La0.7Ca0.24Sr0.06MnO3single crystal. It was prepared using floating zone technique used under oxygen pressure of 1 bar with a typical growth rate of 1 mm/hr. The resistivity data shows the metal to insulator transition (M-I) occuring atTMI=290 K along thec-axis and atTMI=280 K along theab-plane. It is observed that theTMIis higher along thec-axis as compared to that in theab-plane, thus indicating that more favorable hoping of electrons is along thec-axis. From bolometric application point of view, the temperature coefficient of resistance (TCR) is found to be ~28% K−1. Theac-susceptibility measurement shows that this material exhibits ferromagnetic to paramagnetic transition temperature (TC) 277 K. Sharp peak around this temperature in heat capacity data indicates the onset of long-range ordering. The entropy change associated with this transition is found to be 2.3 J/mol K.
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