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
中科院分区:
文献类型:
--
作者:
Anand V
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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