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Nonlocal Kondo effect and quantum critical phase in heavy-fermion metals
- Source :
- Physical Review B. 104
- Publication Year :
- 2021
- Publisher :
- American Physical Society (APS), 2021.
-
Abstract
- Heavy fermion metals typically exhibit unconventional quantum critical point or quantum critical phase at zero temperature due to competition of Kondo effect and magnetism. Previous theories were often based on certain local type of assumptions and a fully consistent explanation of experiments has not been achieved. Here we develop an efficient algorithm for the Schwinger boson approach to explore the effect of spatial correlations on the Kondo lattice and introduce the concept of nonlocal Kondo effect in the quantum critical region with deconfined spinons. We predict a global phase diagram containing a non-Fermi liquid quantum critical phase with a hidden holon Fermi surface and a partially enlarged electron Fermi surface for strong quantum fluctuations while a single quantum critical point for weak quantum fluctuations. This explains the unusual metallic spin liquid recently reported in the frustrated Kondo lattice CePdAl and resolves the Fermi volume puzzle in YbRh$_2$Si$_2$. Our theory highlights the importance of nonlocal physics and provides a unified understanding of heavy fermion quantum criticality.<br />11 pages, 6 figures
- Subjects :
- Physics
Strongly Correlated Electrons (cond-mat.str-el)
Condensed matter physics
Lattice (group)
FOS: Physical sciences
Fermi surface
Spinon
Condensed Matter - Strongly Correlated Electrons
Quantum critical point
Condensed Matter::Strongly Correlated Electrons
Kondo effect
Quantum spin liquid
Quantum
Quantum fluctuation
Subjects
Details
- ISSN :
- 24699969 and 24699950
- Volume :
- 104
- Database :
- OpenAIRE
- Journal :
- Physical Review B
- Accession number :
- edsair.doi.dedup.....dd4656de14e0c7fd7d2b8c4f12a15ae9