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Localized 5f electrons in superconducting PuCoIn₅: consequences for superconductivity in PuCoGa₅.
E D Bauer1, M M Altarawneh, P H Tobash
1Los Alamos National Laboratory, Los Alamos, NM 87545, USA.
Journal of Physics. Condensed Matter : an Institute of Physics Journal
|December 24, 2011
Summary
Researchers studied PuCoIn(5) superconductors, finding their properties differ significantly from PuCoGa(5). This suggests different mechanisms drive their superconductivity, with PuCoIn(5) linked to quantum critical points.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Superconductivity
Background:
- The PuMGa(5) (M = Co, Rh) family exhibits complex superconducting properties.
- Understanding the role of Pu 5f electrons is crucial for explaining superconductivity in these materials.
Purpose of the Study:
- To investigate the physical properties of PuCoIn(5), the first Indium analog in the PuMGa(5) family.
- To compare the electronic and magnetic properties of PuCoIn(5) with PuCoGa(5).
- To elucidate the underlying mechanisms responsible for superconductivity in PuCoIn(5).
Main Methods:
- Synthesis and characterization of PuCoIn(5) single crystals.
- Physical property measurements, including magnetic susceptibility and resistivity.
- Analysis of unit cell volume and spin-fluctuation energy scales.
Main Results:
- PuCoIn(5) has a unit cell volume 28% larger than PuCoGa(5).
- The spin-fluctuation energy scale in PuCoIn(5) is 3-4 times smaller than in PuCoGa(5).
- Pu 5f electrons in PuCoIn(5) appear more localized than in PuCoGa(5).
Conclusions:
- The observed differences suggest distinct origins for superconductivity in PuCoIn(5) and PuCoGa(5).
- PuCoGa(5)'s high T(c) may relate to proximity to a valence instability.
- PuCoIn(5)'s superconductivity at T(c) = 2.5 K is likely mediated by antiferromagnetic spin fluctuations near a quantum critical point.
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