Superconductivity in LnFePO (Ln = La, Pr, and Nd) single crystals

Details Superconductivity in LnFePO (Ln = La, Pr, and Nd) single crystals Superconductivity in LnFePO (Ln = La, Pr, and Nd) single crystals

2008-12-03

arxiv.org/abs/0812.0774v1

Physics

Condensed Matter

Superconductivity

submitted to the New Journal of Physics

Scientific paper

10.1088/1367-2630/11/2/025018

Single crystals of the compounds LaFePO, PrFePO, and NdFePO have been prepared by means of a flux growth technique and studied by electrical resistivity, magnetic susceptibility and specific heat measurements. We have found that PrFePO and NdFePO display superconductivity with values of the superconducting critical temperature T_c of 3.2 K and 3.1 K, respectively. The effect of annealing on the properties of LaFePO, PrFePO, and NdFePO is also reported. The LnFePO (Ln = lanthanide) compounds are isostructural with the LnFeAsO_{1-x}F_x compounds that become superconducting with T_c values as high as 55 K for Ln = Sm. A systematic comparison of the occurrence of superconductivity in the series LnFePO and LnFeAsO_{1-x}F_x points to a possible difference in the origin of the superconductivity in these two series of compounds.

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