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C R Rotundu, D T Keane, B Freelon, S D Wilson, A Kim, P N Valdivia, E Bourret-Courchesne, and R J Birgeneau. Phase diagram of the PrFeAsO_{1-x}F_{x} superconductor. Physical Review B, 80, p. 144517, 2009.

Abstract: The electronic phase diagram of PrFeAsO_{1-x}F_{x} (0<=x<=0.225) has been determined using synchrotron x-ray powder-diffraction, magnetization, and resistivity measurements. The structural transition temperature is suppressed from 154 to [approximate]120 K and the magnetic phase transitions of both iron and praseodymium ions are completely suppressed by x[approximate]0.08 fluorine doping, coinciding with the emergence of superconductivity. The optimal doping is x[approximate]0.15 when TC=47 K while the maximum solubility of fluorine in PrFeAsO_{1-x}F_{x} is reached around x=0.22. The structural, magnetic, and superconducting phase diagram is presented.

Keywords: doping, electrical resistivity, iron compounds, magnetic transitions, magnetisation, phase diagrams, praseodymium compounds, solubility, superconducting materials, X-ray diffraction

URL: http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=PRBMDO000080000014144517000001&idtype=cvips&gifs=yes

Posted by Costel R Rotundu

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