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High-pressure synthesis and characterizations of a new ternary Ce-based compound CeTiAs.
J Phys Condens Matter
October 2024
Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China.
Article Synopsis
- A new cerium-based compound, CeTiAs, was synthesized under high-pressure and high-temperature conditions, featuring a hexagonal structure with zig-zag Ce chains.
- This metallic compound has a magnetic phase transition at 13 K and a metamagnetic transition at approximately 0.7 T, indicating complex magnetic behavior.
- Its heavy Fermion behavior, evidenced by a Sommerfeld coefficient of about 215 mJ/(Ce-mol*K), and unique resistivity profile suggest the influence of crystal electric fields and magnetic scattering interactions.
Unraveling the origin of Kondo-like behavior in the 3-electron heavy-fermion compound YFeGe.
Proc Natl Acad Sci U S A
September 2024
Department of Physics and Fribourg Center for Nanomaterials, University of Fribourg, Fribourg CH-1700, Switzerland.
The heavy fermion (HF) state of [Formula: see text]-electron systems is of great current interest since it exhibits various exotic phases and phenomena that are reminiscent of the Kondo effect in [Formula: see text]-electron HF systems. Here, we present a combined infrared spectroscopy and first-principles band structure calculation study of the [Formula: see text]-electron HF compound YFe[Formula: see text]Ge[Formula: see text]. The infrared response exhibits several charge-dynamical hallmarks of HF and a corresponding scaling behavior that resemble those of the [Formula: see text]-electron HF systems.
View Article and Find Full Text PDFModulation of Kondo Behavior in a Two-Dimensional Epitaxial Bilayer Bi(111)/FeGeTe Moiré Heterostructure.
ACS Nano
August 2024
School of Physics, Beihang University, Beijing 100191, China.
Artificial two-dimensional (2D) moiré superlattices provide a platform for generating exotic quantum matter or phenomena. Here, an epitaxial heterostructure composed of bilayer Bi(111) and an FeGeTe substrate with a zero-twist angle is acquired by molecular beam epitaxy. Scanning tunneling microscopy and spectroscopy studies reveal the spatially tailored Kondo resonance and interfacial magnetism within this moiré superlattice.
View Article and Find Full Text PDFA single crystal study of Kagome metals UMnGe and UFeGe.
J Phys Condens Matter
May 2024
Department of Physics, Washington University in St. Louis, St. Louis, MO 63130, United States of America.
Single crystals of UMnGe and UFeGe with a Kagome lattice structure were synthesized using a high-temperature self-flux crystal growth method. The physical properties of these crystals were characterized through measurements of resistivity, magnetism, and specific heat. UFeGe exhibits ferromagnetic ground state and anomalous Hall effect, and UMnGe demonstrates a complex magnetic structure.
View Article and Find Full Text PDFMigdal-Eliashberg superconductivity in a Kondo lattice.
J Phys Condens Matter
May 2024
Department of Physics, Kent State University, Kent, OH 44242, United States of America.
We apply the Migdal-Eliashberg theory of superconductivity to heavy-fermion and mixed valence materials. Specifically, we extend the Anderson lattice model to a case when there exists a strong coupling between itinerant electrons and lattice vibrations. Using the saddle-point approximation, we derive a set of coupled nonlinear equations which describe competition between the crossover to a heavy-fermion or mixed-valence regimes and conventional superconductivity.
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