Substitution of Ni for Fe in superconducting Fe0.98Te0.5Se0.5 depresses the normal-state conductivity but not the magnetic spectral weight

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

doi:10.1103/PhysRevB.91.014501

Title: Substitution of Ni for Fe in superconducting ${Fe}_{0.98} {Te}_{0.5} {Se}_{0.5}$ depresses the normal-state conductivity but not the magnetic spectral weight

Journal Article · Mon Jan 05 00:00:00 EST 2015 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PhysRevB.91.014501· OSTI ID:1182503

Wang, Jinghui ^[1]; Zhong, Ruidan ^[2]; Li, Shichao ^[1]; Gan, Yuan ^[1]; Xu, Zhijun ^[3]; Zhang, Cheng ^[2]; Ozaki, T. ^[4]; Matsuda, M. ^[5]; Zhao, Yang ^[6]; Li, Qiang ^[4]; Xu, Guangyong ^[4]; Gu, Genda ^[4]; Tranquada, J. M. ^[4]; Birgeneau, R. J. ^[3]; Wen, Jinsheng ^[1]

Nanjing Univ., Nanjing (China)
Brookhaven National Lab. (BNL), Upton, NY (United States); Stony Brook Univ., Stony Brook, NY (United States)
Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Brookhaven National Lab. (BNL), Upton, NY (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
National Institute of Standards and Technology, Gaithersburg, MD (United States); Univ. of Maryland, College Park, MD (United States)

In this study, we have performed systematic resistivity and inelastic neutron scattering measurements on Fe_0.98-zNi_zTe_0.5Se_0.5 samples to study the impact of Ni substitution on the transport properties and the low-energy (≤12meV) 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 concentration. 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.

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Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). High Flux Isotope Reactor (HFIR)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC00112704; AC02-05CH11231; AC02-98CH10886; AC05-00OR22725

OSTI ID:: 1182503

Alternate ID(s):: OSTI ID: 1181446; OSTI ID: 1265269

Report Number(s):: BNL-107409-2015-JA; PRBMDO; R&D Project: PO010; KC0201060

Journal Information:: Physical Review. B, Condensed Matter and Materials Physics, Vol. 91, Issue 1; ISSN 1098-0121

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 7 works

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Title: Substitution of Ni for Fe in superconducting Fe 0.98 Te 0.5 Se 0.5 depresses the normal-state conductivity but not the magnetic spectral weight

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Title: Substitution of Ni for Fe in superconducting ${Fe}_{0.98} {Te}_{0.5} {Se}_{0.5}$ depresses the normal-state conductivity but not the magnetic spectral weight