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arXiv 0907.2961cond-mat.str-elcond-mat.mtrl-scicond-mat.supr-con
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由电阻率、磁化强度和specific heat测量获得的CeFeAs $_{1-x}$ P $_{x}$ O的Phase diagram

Phase diagram of CeFeAs$_{1-x}$P$_{x}$O obtained from electric resistivity, magnetization, and specific heat measurements

Yongkang Luo, Yuke Li, Shuai Jiang, Jianhui Dai, Guanghan Cao, Zhuan Xu

摘要:

通过电阻率、磁化强度和比热等测试手段对CeFeAs $_{1-x}$ P $_{x}$ O($0\leq x\leq 1$)的性质进行了系统的研究。c轴晶格常数随P含量的增加而显著减小,表明存在显著的化学压。Fe-3d电子在P掺杂后表现出增强的金属行为,并在$x \approx 0.4$附近发生磁量子相变。同时,Ce-4f电子在相同掺杂水平附近发展出铁磁有序。在$x=0.9$附近,铁磁序非常小。这些数据表明,像$x\geq 0.95$这样的重费米子行为。在低于2K的温度下没有观察到超导性。结果表明,铁磁有序态作为一个中间相介于反铁磁坏金属和重费米子金属之间,支持了含铈铁磷属元素化合物是一个独特的层状Kondo晶格体系.

英文摘要:

We performed a systematic study on the properties of CeFeAs$_{1-x}$P$_{x}$O ($0\leq x\leq 1$) 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 $x \approx 0.4$. Meanwhile, the Ce-4f electrons develop a ferromagnetic order near the same doping level. The ferromagnetic order is vanishingly small around $x=0.9$. The data suggest a heavy-fermion-like behavior as $x\geq 0.95$. 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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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