Antiferromagnetic transition in EuFe(2)As(2): A possible parent compound for superconductors

作者：Ren Zhi^*; Zhu Zengwei; Jiang Shuai; Xu Xiangfan; Tao Qian; Wang Cao; Feng Chunmu; Cao Guanghan; Xu Zhu'an

来源：Physical Review B, 2008, 78(5): 052501.

DOI：10.1103/PhysRevB.78.052501

Ternary iron arsenide EuFe(2)As(2) with ThCr(2)Si(2)-type structure has been studied by magnetic susceptibility, resistivity, thermopower, Hall, and specific-heat measurements. The compound undergoes two magnetic phase transitions at about 200 and 20 K, respectively. The former was found to be accompanied with a slight drop in magnetic susceptibility (after subtracting the Curie-Weiss paramagnetic contribution), a rapid decrease in resistivity, a large jump in thermopower, and a sharp peak in specific heat with decreasing temperature, all of which point to a spin-density-wave-like anti ferromagnetic transition. The latter was proposed to be associated with an A-type antiferromagnetic ordering of Eu(2+) moments. Comparing with the physical properties of the isostructural compounds BaFe(2)As(2) and SrFe(2)As(2), we expect that superconductivity could be induced in EuFe(2)As(2) through appropriate doping.

• 出版日期2008-8
• 单位浙江大学