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Direct transition between a singlet Mott insulator and a superconductor.
M Capone1, M Fabrizio, E Tosatti
1International School for Advanced Studies (SISSA), and Istituto Nazionale per la Fisica della Materia (INFM) Unità Trieste-SISSA, Via Beirut 2-4, I-34014 Trieste, Italy.
Physical Review Letters
|June 1, 2001
Summary
A normal Fermi liquid and a spin-gapped Mott insulator require an intermediate phase for connection. This study identifies superconductivity as the crucial intervening phase, revealing new quantum material insights.
Area of Science:
- Condensed Matter Physics
- Quantum Materials Science
Background:
- The relationship between metallic Fermi liquids and insulating Mott states is complex.
- Continuous transitions between these phases are not always possible, suggesting intermediate states.
Purpose of the Study:
- To investigate the nature of the intermediate phase between a Fermi liquid and a Mott insulator.
- To explore scenarios where orbital degeneracy and inverted Hund's coupling stabilize a Mott insulator.
Main Methods:
- Theoretical modeling of electronic phases.
- Analysis of systems with orbital degeneracy and specific coupling parameters.
- Investigating phase transitions in strongly correlated electron systems.
Main Results:
- A normal Fermi liquid and a singlet, spin-gapped Mott insulator cannot be continuously connected.
- An intermediate phase is required to bridge these two states.
- Superconductivity emerges as the identified intermediate phase in a specific case study.
Conclusions:
- The transition from a Fermi liquid to a Mott insulator is not direct.
- Superconductivity can act as a crucial intermediary phase in certain quantum materials.
- This finding has implications for understanding exotic phases in correlated electron systems.