Physics – Condensed Matter – Superconductivity
Scientific paper
2008-06-09
J. Phys.: Condens. Matter 20, 365220 (2008)
Physics
Condensed Matter
Superconductivity
Submitted to Journal of Physics: Condensed Matter
Scientific paper
10.1088/0953-8984/20/36/365220
Single crystals of the compound LaFePO were prepared using a flux growth technique at high temperatures. Electrical resistivity measurements reveal metallic behavior and a resistive transition to the superconducting state at a critical temperature T_c ~ 6.6 K. Magnetization measurements also show the onset of superconductivity near 6 K. In contrast, specific heat measurements manifest no discontinuity at T_c. These results lend support to the conclusion that the superconductivity is associated with oxygen vacancies that alter the carrier concentration in a small fraction of the sample, although superconductivity characterized by an unusually small gap value can not be ruled-out. Under applied magnetic fields, T_c is suppressed anisotropically for fields perpendicular and parallel to the ab-plane, suggesting that the crystalline anisotropy strongly influences the superconducting state. Preliminary high-pressure measurements show that T_c passes through a maximum of nearly 14 K at ~ 110 kbar, demonstrating that significantly higher T_c values may be achieved in the phosphorus-based oxypnictides.
Baumbach Ryan E.
Hamlin James J.
Maple Brian M.
Sayles T. A.
Zocco Diego A.
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