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Updated: Sep 13, 2025
08:12
Ohmic Contact Fabrication Using a Focused-ion Beam Technique and Electrical Characterization for Layer Semiconductor Nanostructures
Published on: December 5, 2015
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Misfit layered superconductor (PbSe)1.14(NbSe2)3 with possible layer-selective FFLO state.
Yuki M Itahashi1,2, Yamato Nohara2, Michiya Chazono3
1RIKEN Center for Emergent Matter Science (CEMS), Wako, Japan.
Nature Communications
|July 31, 2025
Summary
Researchers explored bulk two-dimensional (2D) superconductors using a novel misfit layered compound. They discovered two distinct superconducting phases, including a unique layer-selective Fulde-Ferrell-Larkin-Ovchinnikov state.
Area of Science:
- Condensed Matter Physics
- Materials Science
Background:
- Two-dimensional (2D) superconductors exhibit novel phenomena but are limited by experimental probes.
- Bulk 2D superconductors offer enhanced measurement capabilities.
- Misfit layered compounds provide a platform for studying bulk 2D superconductivity.
Purpose of the Study:
- To synthesize and characterize a novel bulk 2D superconductor with a misfit structure.
- To explore the superconducting states and phase transitions in this material.
- To investigate the emergence of exotic superconducting phases like the Fulde-Ferrell-Larkin-Ovchinnikov state.
Main Methods:
- Synthesis of single crystals of the misfit layered compound (PbSe)1.14(NbSe2)3.
- Resistivity measurements.
- Tunnel diode oscillator measurements.
- Theoretical analysis of superconducting states.
Main Results:
- Successful synthesis of a bulk 2D superconductor, (PbSe)1.14(NbSe2)3, maintaining 2D Ising superconductivity.
- Identification of two distinct superconducting phases in the magnetic field vs. temperature phase diagram.
- Evidence for a layer-selective Fulde-Ferrell-Larkin-Ovchinnikov state in the high-magnetic-field phase.
Conclusions:
- Misfit layered bulk 2D superconductors enable advanced studies of superconductivity.
- The unique tri-layer structure facilitates the mixing of Ising and finite-q superconductivity.
- This material offers new avenues for interlayer engineering and understanding exotic superconducting states.
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