Thermal conductivity, thermoelectric power and Mössbauer investigations on atiferromagnetic CeFe1.7Ir0.3Al10

Thermal conductivity, thermoelectric power and Mössbauer investigations on atiferromagnetic CeFe1.7Ir0.3Al10
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反铁磁 CeFe1.7Ir0.3Al10 的热导率、热电势和穆斯堡尔研究

DOI:
10.1016/j.jmmm.2022.169370
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发表时间:
2022
影响因子:
2.7
通讯作者:
Anand V
Anand V
中科院分区:
材料科学3区
文献类型:
--
作者:
Anand V

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已知CeFe2Al10表现出近藤半导体行为,没有任何长程磁有序的特征。发现Ce Fe2 Al10中铁的部分Ir替代导致了系统的长程磁有序,15%Ir替代导致了Ce Fe1.7Ir 0.3Al10中的反铁磁有序态低于3.1(2)K。我们给出了多晶Ce Fe1.7Ir 0.3Al10的电阻率ρ、热导率κ和热电势S的测量结果,以及多晶CEFe1.7Ir0.3Al10的5 7Fe穆斯堡尔谱。ρ(T)表现出近藤晶格行为,并为反铁磁态形成超带隙提供了证据。我们估算了近藤温度T K≈18K,κ(T)没有表现出任何反常,反映了声子主导的热输运。发现洛伦兹数L(T)=κ(T)ρ(T)/T远大于理论索末菲尔德值L 0,这也反映了声子占优势。S(T)在低T时最小(S最小≈−2.3μV/K,T S最小≈30K),在高T时最大(S最大≈5.4μV/K,T S最大≈225K)。S(T)数据由两个洛伦兹形f带贡献的双带模型描述。根据S(T)的分析,我们推断一个贡献f带位于费米能EF以下22K,另一个贡献f带在EF上方190K。零场下采集的57Fe穆斯堡尔谱没有显示出明显的磁有序的证据,然而,在外场中的穆斯堡尔测量支持CEFe1.7Ir0.3Al10的反铁磁有序。
CeFe 2 Al 10 is known to exhibit a Kondo semiconducting behavior without any signature of long range magnetic ordering. A partial Ir substitution for Fe in CeFe 2 Al 10 is found to drive the system towards long range magnetic ordering, and a 15% Ir substitution is found to result in an antiferromagnetically ordered state below 3.1 (2) K in CeFe 1.7 Ir 0.3 Al 10. We present the results of the electrical resistivity ρ, thermal conductivity κ and thermoelectric power S measurements as a function of temperature T, and 57 Fe Mössbauer spectroscopy on polycrystalline CeFe 1.7 Ir 0.3 Al 10. The ρ (T) exhibits Kondo lattice behavior and presents evidence for the formation of a superzone gap in antiferromagnetic state. We estimate Kondo temperature T K≈ 18 K. The κ (T) does not show any anomaly and reflects a phonon dominated thermal transport. The Lorenz number L (T)= κ (T) ρ (T)/T is found to be much larger than the theoretical Sommerfeld value L 0 which also reflects a phonon dominance. The S (T) exhibits a minimum at low T (S min≈− 2. 3 μ V/K, T S min≈ 30 K) and a maximum at high T (S max≈ 5. 4 μ V/K, T S max≈ 225 K). The S (T) data are described by a two-band model with contributions from two Lorentzian shaped f-bands. From the analysis of S (T), we infer that while one of the contributing f-band lies 22 K below the Fermi energy E F, the other one is at 190 K above E F. The 57 Fe Mössbauer spectra collected in zero field do not show clear evidence of magnetic ordering, however, the Mössbauer measurements in external fields support an antiferromagnetic ordering in CeFe 1.7 Ir 0.3 Al 10.
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