paper

Phase diagram of CeFeAsPO obtained from electric resistivity, magnetization, and specific heat measurements

arXiv:0907.2961 · doi:10.1103/PhysRevB.81.134422

Abstract

We performed a systematic study on the properties of CeFeAsPO () by electrical resistivity, magnetization and specific heat measurements. The c-axis lattice constant decreases significantly with increasing P content, suggesting a remarkable chemical pressure. The Fe-3d electrons show the enhanced metallic behavior upon P-doping and undergo a magnetic quantum phase transition around . Meanwhile, the Ce-4f electrons develop a ferromagnetic order near the same doping level. The ferromagnetic order is vanishingly small around . The data suggest a heavy-fermion-like behavior as . No superconductivity is observed down to 2 K. Our results show the ferromagnetic ordered state as an intermediate phase intruding between the antiferromagnetic bad metal and the nonmagnetic heavy fermion metal and support the cerium-containing iron pnictides as a unique layered Kondo lattice system.

7 pages, 6 figures, text and figures revised, references added.

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