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Thermal properties of PrBa2Cu4O8prepared at ambient oxygen pressure

Physica C Superconductivity
Publication Date
DOI: 10.1016/s0921-4534(97)00800-9
  • Earth Science


Abstract Polycrystalline PrBa 2Cu 4O 8 (Pr124) has been prepared at ambient oxygen pressure by nitrite pyrolysis method. Powder x-ray-diffraction patterns show a nearly single R124 phase. Thermogravimetric analysis indicates that its thermal stability is distinct from that of Pr123. Specific heat C has been measured from 0.5 to 40 K, and is very similar to that of Pr123. A maximum of C occurs around 17 K which could be due to a magnetic ordering. Entropy difference ΔS has been calculated from ΔC/ T between Pr124 and Y124. The possible origins of ΔS and the related magnetic properties are discussed. Resistivity ϱ( T) of Pr124 shows a nearly metallic behavior similar to what was observed in Pr124 made by the O 2-HIP technique. The metallic ϱ( T) at low temperatures is of interest and will be discussed.

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