Observation of non-Fermi liquid behavior in hole-doped LiFe1-x VxAs

Xing, L. Y.; Shi, X.; Richard, P.; Wang, X. C.; Liu, Q. Q.; Lv, B. Q.; Ma, J. -Z.; Fu, B. B.; Kong, L. -Y.; Miao, H.; Qian, T.; Kim, T. K.; Hoesch, M.; Ding, H.; Jin, C. Q.

doi:10.1103/PhysRevB.94.094524

Title: Observation of non-Fermi liquid behavior in hole-doped LiFe_1-x V_xAs

Journal Article · Wed Sep 28 00:00:00 EDT 2016 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.94.094524· OSTI ID:1336220

Xing, L. Y. ^[1]; Shi, X. ^[1]; Richard, P. ^[2]; Wang, X. C. ^[1]; Liu, Q. Q. ^[1]; Lv, B. Q. ^[1]; Ma, J. -Z. ^[1]; Fu, B. B. ^[1]; Kong, L. -Y. ^[1]; Miao, H. ^[3]; Qian, T. ^[4]; Kim, T. K. ^[5]; Hoesch, M. ^[5]; Ding, H. ^[2]; Jin, C. Q. ^[2]

Chinese Academy of Sciences (CAS), Beijing (China). Inst. of Physics. Beijing National Lab. for Condensed Matter Physics (BNLCP-CAS)
Chinese Academy of Sciences (CAS), Beijing (China). Inst. of Physics. Beijing National Lab. for Condensed Matter Physics (BNLCP-CAS); Collaborative Innovation Center of Quantum Matter, Beijing (China); Univ. of Chinese Academy of Sciences, Beijing (China). School of Physical Sciences
Brookhaven National Lab. (BNL), Upton, NY (United States). Condensed Matter Physics and Materials Science Dept.
Chinese Academy of Sciences (CAS), Beijing (China). Inst. of Physics. Beijing National Lab. for Condensed Matter Physics (BNLCP-CAS); Collaborative Innovation Center of Quantum Matter, Beijing (China)
Science and Technology Facilities Council (STFC), Harwell Campus, Oxford (United Kingdom). Diamond Light Source, Ltd.

Here we synthesized a series of V-doped LiFe_1₋xV_xAs single crystals. The superconducting transition temperature T_c of LiFeAs decreases rapidly at a rate of 7 K per 1% V. The Hall coefficient of LiFeAs switches from negative to positive with 4.2% V doping, showing that V doping introduces hole carriers. This observation is further confirmed by the evaluation of the Fermi surface volume measured by angle-resolved photoemission spectroscopy (ARPES), from which a 0.3 hole doping per V atom introduced is deduced. Interestingly, the introduction of holes does not follow a rigid band shift. We also show that the temperature evolution of the electrical resistivity as a function of doping is consistent with a crossover from a Fermi liquid to a non-Fermi liquid. Our ARPES data indicate that the non-Fermi liquid behavior is mostly enhanced when one of the hole d_xz/dyz Fermi surfaces is well nested by the antiferromagnetic wave vector to the inner electron Fermi surface pocket with the d_xy orbital character. In conclusion, the magnetic susceptibility of LiFe_1₋xV_xAs suggests the presence of strong magnetic impurities following V doping, thus providing a natural explanation to the rapid suppression of superconductivity upon V doping.

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Research Organization:: Brookhaven National Lab. (BNL), Upton, NY (United States)

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

Grant/Contract Number:: SC00112704

OSTI ID:: 1336220

Report Number(s):: BNL-113246-2016-JA; R&D Project: PO011; KC0201060

Journal Information:: Physical Review B, Vol. 94, Issue 9; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 13 works

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Title: Observation of non-Fermi liquid behavior in hole-doped LiFe_1-x V_xAs