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Quasi-Two-Dimensional Antiferromagnetic Spin Fluctuations in the Spin-Triplet Superconductor Candidate CeRh_{2}As_{2}.
Phys Rev Lett
December 2024
Johns Hopkins University, Institute for Quantum Matter and Department of Physics and Astronomy, Baltimore, Maryland 21218, USA.
The tetragonal heavy-fermion superconductor CeRh_{2}As_{2} (T_{c}=0.3 K) exhibits an exceptionally high critical field of 14 T for B∥c. It undergoes a field-driven first-order phase transition between superconducting states, potentially transitioning from spin-singlet to spin-triplet superconductivity.
View Article and Find Full Text PDFSuperconductivity and Mott Physics in Organic Charge Transfer Materials.
Phys Rev Lett
September 2024
Max-Planck-Institut für Festkörperforschung, Heisenbergstraße 1, 70569 Stuttgart, Germany.
Article Synopsis
- Quasi two-dimensional organic superconductors exhibit complex behaviors due to strong electron correlations, including unconventional superconductivity, metal-insulator transitions, and unique magnetic properties.
- The study uses the Hubbard model on an anisotropic triangular lattice to analyze these compounds, employing advanced quantum embedding techniques that respect the lattice's symmetry.
- Findings indicate a transition from Fermi liquid metal to Mott insulator linked to a pseudogap, with a distinctive pattern in the Fermi surface that inspires further experimental research, aligning well with the existing phase diagrams of κ-BEDT organics.
Large transverse thermoelectric effect induced by the mixed-dimensionality of Fermi surfaces.
Nat Commun
May 2024
Institute for Materials Research, Tohoku University, Oarai, Ibaraki, Japan.
Transverse thermoelectric effect, the conversion of longitudinal heat current into transverse electric current, or vice versa, offers a promising energy harvesting technology. Materials with axis-dependent conduction polarity, known as p × n-type conductors or goniopolar materials, are potential candidate, because the non-zero transverse elements of thermopower tensor appear under rotational operation, though the availability is highly limited. Here, we report that a ternary metal LaPtB with unique crystal structure exhibits axis-dependent thermopower polarity, which is driven by mixed-dimensional Fermi surfaces consisting of quasi-one-dimensional hole sheet with out-of-plane velocity and quasi-two-dimensional electron sheets with in-plane velocity.
View Article and Find Full Text PDFQuasi-2D spin-Peierls transition through interstitial anionic electrons in K(NH).
Sci Bull (Beijing)
April 2024
National Laboratory of Solid State Microstructures, School of Physics and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China. Electronic address:
Electron-phonon interactions and electron-electron correlations represent two crucial facets of condensed matter physics. For instance, in a half-filled spin-1/2 anti-ferromagnetic chain, the lattice dimerization induced by electron-nucleus interaction can be intensified by onsite Coulomb repulsion, resulting in a spin-Peierls state. Through first-principles calculations and crystal structure prediction methods, we have identified that under mild pressures, potassium and ammonia can form stable compounds: R3¯m K(NH), Pm3¯m K(NH), and Cm K(NH).
View Article and Find Full Text PDFSuperconductivity in a Layered Cobalt Oxychalcogenide NaCoSeO with a Triangular Lattice.
J Am Chem Soc
March 2024
Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100190, China.
Unconventional superconductivity in bulk materials under ambient pressure is extremely rare among the 3d transition metal compounds outside the layered cuprates and iron-based family. It is predominantly linked to highly anisotropic electronic properties and quasi-two-dimensional (2D) Fermi surfaces. To date, the only known example of a Co-based exotic superconductor is the hydrated layered cobaltate, NaCoO·HO, and its superconductivity is realized in the vicinity of a spin-1/2 Mott state.
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