Low-carrier density and fragile magnetism in a Kondo lattice system.

Autor: Rai BK; Department of Physics and Astronomy and Rice Center for Quantum Materials, Rice University, Houston, Texas 77005, USA., H Oswald IW; Department of Chemistry, University of Texas at Dallas, Richardson, Texas 75080, USA., Ban W; International Center for Quantum Materials, School of Physics, Peking University, Beijing 100871, China., Huang CL; Department of Physics and Astronomy and Rice Center for Quantum Materials, Rice University, Houston, Texas 77005, USA., Loganathan V; Department of Physics and Astronomy and Rice Center for Quantum Materials, Rice University, Houston, Texas 77005, USA., Hallas AM; Department of Physics and Astronomy and Rice Center for Quantum Materials, Rice University, Houston, Texas 77005, USA.; Department of Physics and Astronomy, McMaster University, Hamilton, Ontario, Canada L8S 4M1., Wilson MN; Department of Physics and Astronomy, McMaster University, Hamilton, Ontario, Canada L8S 4M1., Luke GM; Department of Physics and Astronomy, McMaster University, Hamilton, Ontario, Canada L8S 4M1.; Canadian Institute for Advanced Research, 661 University Ave, Suite 505, Toronto, Ontario, Canada M5G 1M1.; TRIUMF, 4004 Wesbrook Mall, Vancouver, B.C., Canada V6T 2A3., Harriger L; NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA., Huang Q; NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA., Li Y; Department of Physics and Astronomy and Rice Center for Quantum Materials, Rice University, Houston, Texas 77005, USA., Dzsaber S; Institute of Solid State Physics, Vienna University of Technology, Wiedner Hauptstrasse 8-10, 1040 Vienna, Austria., Chan JY; Department of Chemistry, University of Texas at Dallas, Richardson, Texas 75080, USA., Wang NL; International Center for Quantum Materials, School of Physics, Peking University, Beijing 100871, China., Paschen S; Institute of Solid State Physics, Vienna University of Technology, Wiedner Hauptstrasse 8-10, 1040 Vienna, Austria., Lynn JW; NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA., Nevidomskyy AH; Department of Physics and Astronomy and Rice Center for Quantum Materials, Rice University, Houston, Texas 77005, USA., Dai P; Department of Physics and Astronomy and Rice Center for Quantum Materials, Rice University, Houston, Texas 77005, USA., Si Q; Department of Physics and Astronomy and Rice Center for Quantum Materials, Rice University, Houston, Texas 77005, USA., Morosan E; Department of Physics and Astronomy and Rice Center for Quantum Materials, Rice University, Houston, Texas 77005, USA.
Jazyk: angličtina
Zdroj: Physical review. B [Phys Rev B] 2019 Feb 12; Vol. 99.
DOI: 10.1103/PhysRevB.99.085120
Abstrakt: 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 4 f 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 Yb 3 Ir 4 Ge 13 along with its closed-4 f -shell counterpart, Lu 3 Ir 4 Ge 13 . Through magnetotransport, optical conductivity, and thermodynamic measurements, we establish that the correlated semimetallic state of Yb 3 Ir 4 Ge 13 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.
Databáze: MEDLINE