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Anomalous Hall Effect and Quantum Criticality in Geometrically Frustrated Heavy Fermion Metals.
Phys Rev Lett
September 2024
Department of Physics & Astronomy, Rice University, Houston, Texas 77005, USA.
Studies on the heavy-fermion pyrochlore iridate (Pr_{2}Ir_{2}O_{7}) point to the role of time-reversal-symmetry breaking in geometrically frustrated Kondo lattices. Here, we address the effect of Kondo coupling and chiral spin liquids in a J_{1}-J_{2} model on a square lattice and a model on a kagome lattice via a large-N method, based on a fermionic representation of the spin operators, and consider a new mechanism for anomalous Hall effect for the chiral phases. We calculate the anomalous Hall response for the chiral states of both the Kondo destroyed and Kondo screened phases.
View Article and Find Full Text PDFSingular Hall Response from a Correlated Ferromagnetic Flat Nodal-Line Semimetal.
Adv Mater
August 2024
Department of Physics, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, 34141, South Korea.
Topological quantum phases are largely understood in weakly correlated systems, which have identified various quantum phenomena, such as the spin Hall effect, protected transport of helical fermions, and topological superconductivity. Robust ferromagnetic order in correlated topological materials particularly attracts attention, as it can provide a versatile platform for novel quantum devices. Here, a singular Hall response arising from a unique band structure of flat topological nodal lines in combination with electron correlation in a van der Waals ferromagnetic semimetal, FeGaTe, with a high Curie temperature of T = 347 K is reported.
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 PDFField-induced compensation of magnetic exchange as the possible origin of reentrant superconductivity in UTe.
Nat Commun
January 2024
Univ. Grenoble Alpes, CEA, Grenoble-INP, IRIG, PHELIQS, 38000, Grenoble, France.
The potential spin-triplet heavy-fermion superconductor UTe exhibits signatures of multiple distinct superconducting phases. For field aligned along the b axis, a metamagnetic transition occurs at μH ≈ 35 T. It is associated with magnetic fluctuations that may be beneficial for the field-reinforced superconductivity surviving up to H.
View Article and Find Full Text PDFEvidence for charge delocalization crossover in the quantum critical superconductor CeRhIn.
Nat Commun
November 2023
Center for Quantum Materials and Superconductivity (CQMS), Sungkyunkwan University, Suwon, South Korea.
The nature of charge degrees-of-freedom distinguishes scenarios for interpreting the character of a second order magnetic transition at zero temperature, that is, a magnetic quantum critical point (QCP). Heavy-fermion systems are prototypes of this paradigm, and in those, the relevant question is where, relative to a magnetic QCP, does the Kondo effect delocalize their f-electron degrees-of-freedom. Herein, we use pressure-dependent Hall measurements to identify a finite-temperature scale E that signals a crossover from f-localized to f-delocalized character.
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