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Exotic Multigap Structure in UPt_{3} Unveiled by a First-Principles Analysis.
Takuya Nomoto1, Hiroaki Ikeda2
1Department of Physics, Kyoto University, Kyoto 606-8502, Japan.
Physical Review Letters
|December 3, 2016
Summary
Researchers uncovered a novel superconducting gap structure in the heavy-fermion superconductor UPt3, challenging existing models. This unprecedented E2u state, described by a new theoretical framework, offers insights into complex superconductivity.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Quantum Materials
Background:
- Upt3 is a unique spin-triplet superconductor with multiple superconducting phases.
- Understanding its microscopic superconducting gap structure is crucial for explaining its complex properties.
Purpose of the Study:
- To perform a first-principles analysis of the microscopic superconducting gap structure of Upt3.
- To identify and characterize the specific superconducting state responsible for Upt3's properties.
Main Methods:
- First-principles calculations.
- Analysis of superconducting gap structure.
- Group-theoretical analysis of Cooper pairs.
Main Results:
- Identified an unprecedented E2u superconducting gap structure, distinct from previous phenomenological models.
- Observed in-plane twofold vertical line nodes on small Fermi surfaces and point nodes with linear dispersion on a large Fermi surface.
- Demonstrated that these features are described by group-theoretical representation in the total angular momentum j=5/2 space, not conventional spin 1/2 representation.
Conclusions:
- The findings provide a new theoretical framework for understanding the superconductivity of Upt3.
- This work sheds new light on long-standing problems in Upt3 superconductivity.
- The unprecedented E2u state offers a pathway to understanding complex superconducting phenomena.
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