@article{e84be655b3104130ab3d56c2950025ba,
title = "Low-carrier density and fragile magnetism in a Kondo lattice system",
abstract = "Kondo-based semimetals and semiconductors are of extensive current interest as a viable platform for strongly correlated states in the dilute carrier limit. It is thus important to explore the routes to understand such systems. One established pathway is through the Kondo effect in metallic nonmagnetic analogs, in the so called half-filling case of one conduction electron and one 4f electron per site. Here, we demonstrate that Kondo-based semimetals develop out of conduction electrons with a low-carrier density in the presence of an even number of rare-earth sites. We do so by studying the Kondo material Yb3Ir4Ge13 along with its closed-4f-shell counterpart, Lu3Ir4Ge13. Through magnetotransport, optical conductivity, and thermodynamic measurements, we establish that the correlated semimetallic state of Yb3Ir4Ge13 below its Kondo temperature originates from the Kondo effect of a low-carrier conduction-electron background. In addition, it displays fragile magnetism at very low temperatures, which in turn, can be tuned to a Griffiths-phase-like regime through Lu-for-Yb substitution. These findings are connected with recent theoretical studies in simplified models. Our results can pave the way to exploring strong correlation physics in a semimetallic environment.",
author = "Rai, {Binod K.} and Oswald, {Iain W.H.} and Wenjing Ban and Huang, {C. L.} and V. Loganathan and Hallas, {A. M.} and Wilson, {M. N.} and Luke, {G. M.} and L. Harriger and Q. Huang and Y. Li and Sami Dzsaber and Chan, {Julia Y.} and Wang, {N. L.} and Silke Paschen and Lynn, {J. W.} and Nevidomskyy, {Andriy H.} and Pengcheng Dai and Q. Si and E. Morosan",
note = "Funding Information: We thank B. S. Hitti for assistance with the μ SR measurements, and J. M. Santiago for assistance with the neutron diffraction measurements. We thank K. Iwasa and M. S. Foster for fruitful discussions. B.K.R., C.-L.H., and E.M. acknowledge support from the Gordon and Betty Moore Foundation EPiQS Initiative through Grant No. GBMF 4417. N.L.W. is supported by the National Science Foundation of China (No. 11888101) and the National Key Research and Development Program of China (No. 2016YFA0300902 and No. 2017YFA0302904). A.M.H., M.N.W., and G.M.L. acknowledge support from NSERC of Canada. The neutron scattering work at Rice is supported by the U.S. DOE, BES under Contract No. DE-SC0012311 (P.D.). A part of the material characterization work at Rice is supported by the Robert A. Welch Foundation Grant No. C-1839 (P.D.). The theoretical work at Rice University was supported by NSF CAREER Grant No. DMR-1350237 (A.H.N.) and the Robert A. Welch Foundation Grant No. C-1818 (V.L. and A.H.N.), as well as by the NSF Grant No. DMR-1611392 and the Robert A. Welch Foundation Grant No. C-1411 (Q.S.), with travel support provided by the ARO Grant No. W911NF-14-1-0525. UT Dallas acknowledges support from NSF DMR-1700030. S.D. acknowledges Junior Short Award ICAM-I2CAM QuantEmX scientific report. S.D. and S.P. gratefully acknowledge financial support from the Austrian Science Funds (FWF doctoral program W1243 and FWF I2535-N27) and the U.S. Army research office (Grant No. W911NF-14-1-0496). The identification of any commercial product or trade name does not imply endorsement or recommendation by the National Institute of Standards and Technology. Publisher Copyright: {\textcopyright} 2019 American Physical Society.",
year = "2019",
month = feb,
day = "12",
doi = "10.1103/PhysRevB.99.085120",
language = "English",
volume = "99",
journal = "Physical Review B",
issn = "2469-9950",
publisher = "American Physical Society",
number = "8",
}