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Multiphase superconductivity in PdBi.
Nat Commun
January 2025
Department of Physics and Astronomy, University of Manchester, Manchester, UK.
Unconventional superconductivity, where electron pairing does not involve electron-phonon interactions, is often attributed to magnetic correlations in a material. Well known examples include high-T cuprates and uranium-based heavy fermion superconductors. Less explored are unconventional superconductors with strong spin-orbit coupling, where interactions between spin-polarised electrons and external magnetic field can result in multiple superconducting phases and field-induced transitions between them, a rare phenomenon in the superconducting state.
View Article and Find Full Text PDFBroadened quantum critical ground state in a disordered superconducting thin film.
Nat Commun
March 2024
Department of Physics, Tokyo Institute of Technology, 2-12-1 Ohokayama, Meguro-ku, Tokyo, 152-8551, Japan.
Article Synopsis
- The superconductor-insulator transition (SIT) in two dimensions represents a key quantum phase transition with a quantum critical point at absolute zero temperature (T=0).
- In certain weakly disordered or crystalline thin films, an anomalous metallic (AM) state shows up between superconducting and insulating states, complicating the traditional QPT understanding of SIT.
- Measurements of the Nernst effect reveal a ghost-temperature line marking a thermal-to-quantum crossover, helping to locate the QCP within the AM state, thereby suggesting that the AM state is a critical extension of the SIT.
Iron Vacancy Tunable Superconductor-Insulator Transition in FeSe/SrTiO_{3} Monolayer.
Phys Rev Lett
December 2023
National Laboratory of Solid State Microstructures, School of Physics, Nanjing University, Nanjing 210093, China.
The Fe_{4}Se_{5} with a sqrt[5]×sqrt[5] Fe vacancy order is suggested to be a Mott insulator and the parent state of bulk FeSe superconductor. The iron vacancy ordered state has been considered as a Mott insulator and the parent compound of bulk FeSe-based superconductors. However, for the superconducting FeSe/SrTiO_{3} monolayer (FeSe/STO) with an interface-enhanced high transition temperature (T_{c}), the electronic evolution from its Fe vacancy ordered parent phase to the superconducting state, has not been explored due to the challenge to realize an Fe vacancy order in the FeSe/STO monolayer, even though important to the understanding of superconductivity mechanism.
View Article and Find Full Text PDFQuantum phase transitions in two-dimensional superconductors: a review on recent experimental progress.
Rep Prog Phys
December 2023
International Center for Quantum Materials, School of Physics, Peking University, Beijing 100871, People's Republic of China.
Article Synopsis
- - The superconductor-insulator/metal transition (SMT) is a key topic in quantum phase transition research, particularly in two-dimensional (2D) superconductors, highlighting recent advancements in fabrication and measurement techniques.
- - The review emphasizes the discovery of quantum Griffiths singularity (QGS) in ultrathin crystalline Ga films and other 2D superconductors, showcasing its critical role in understanding the effects of quenched disorder on these quantum phase transitions.
- - Additionally, the emergence of anomalous metallic states in high-temperature superconducting films suggests a new classification of metals in low-temperature regimes, with strong evidence supporting the existence of a bosonic nature in the observed quantum metal states.
Chaotic dynamics from coupled magnetic monodomain and Josephson current.
Phys Rev E
February 2023
Department of Physics, Institute for Advanced Studies in Basic Sciences, Zanjan 45137-66731, Iran.
The ordinary (superconductor-insulator-superconductor) Josephson junction cannot exhibit chaos in the absence of an external ac drive, whereas in the superconductor-ferromagnet-superconductor Josephson junction, known as the φ_{0} junction, the magnetic layer effectively provides two extra degrees of freedom that can facilitate chaotic dynamics in the resulting four-dimensional autonomous system. In this work, we use the Landau-Lifshitz-Gilbert model for the magnetic moment of the ferromagnetic weak link, while the Josephson junction is described by the resistively capacitively shunted-junction model. We study the chaotic dynamics of the system for parameters surrounding the ferromagnetic resonance region, i.
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