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Substitution of Ni for Fe in Superconducting Fe0.98Te0.5Se0.5 Depresses the Normal-State Conductivity but not the Magnetic Spectral Weight



Jinghui Wang, Ruidan Zhong, Shichao Li, Yuan Gan, Zhijun Xu, Cheng Zhang, T Ozaki, M. Matsuda, Yang Zhao, Qiang Li, Guangyong Xu, Genda Gu, J. M. Tranquada, R. J. Birgeneau, Jinsheng Wen


We have performed systematic resistivity and inelastic neutron scattering measurements on Fe0.98-zNizTe0.5Se0.5 samples to study the impact of Ni substitution on the transport properties and the low-energy (less than or equal to} 12 meV) magnetic excitations. It is found that, with increasing Ni doping, both the conductivity and superconductivity are gradually suppressed; in contrast, the low-energy magnetic spectral weight changes little. Comparing with the impact of Co and Cu substitution, we find that the effects on conductivity and superconductivity for the same degree of substitution grow systematically as the atomic number of the substituent deviates from that of Fe. The impact of the substituents as scattering centers appears to be greater than any contribution to carrier density. The fact that low-energy magnetic spectral weight is not reduced by increased electron scattering indicates that the existence of antiferromagnetic correlations does not depend on electronic states close to the Fermi energy.
Physical Review B


Superconductivity, neutron scattering


Wang, J. , Zhong, R. , Li, S. , Gan, Y. , Xu, Z. , Zhang, C. , Ozaki, T. , Matsuda, M. , Zhao, Y. , Li, Q. , Xu, G. , Gu, G. , Tranquada, J. , Birgeneau, R. and Wen, J. (2015), Substitution of Ni for Fe in Superconducting Fe<sub>0.98</sub>Te<sub>0.5</sub>Se<sub>0.5</sub> Depresses the Normal-State Conductivity but not the Magnetic Spectral Weight, Physical Review B, [online], (Accessed May 30, 2023)
Created January 4, 2015, Updated October 12, 2021