Noncentrosymmetric Superconductor BeAu
ORAL
Abstract
Noncentrosymmetric superconductors have attracted tremendous research interest due to the
possibility of mixed spin-singlet and spin-triplet pairing in these materials. In this work, physical
properties of the noncentrosymmetric superconductor BeAu were investigated. It was established
that BeAu undergoes a structural phase transition from a room-temperature noncentrosymmetric
FeSi structure type to a high-temperature CsCl structure type. The roomtemperature
modification undergoes a superconducting transition below Tc = 3.3 K. The values of
lower (Hc1 = 32 Oe) and upper (Hc2 = 335 Oe) critical field are rather small, confirming that
this Type II (κG-L = 2.3) weakly coupled (λe-p = 0.5, ΔCe/γnTc = 1.26) superconductor can be
well understood within the Bardeen-Cooper-Schriefer theory. The muon spin relaxation analysis
indicates that the time-reversal symmetry is preserved when the superconducting state is entered,
supporting conventional superconductivity in BeAu.
possibility of mixed spin-singlet and spin-triplet pairing in these materials. In this work, physical
properties of the noncentrosymmetric superconductor BeAu were investigated. It was established
that BeAu undergoes a structural phase transition from a room-temperature noncentrosymmetric
FeSi structure type to a high-temperature CsCl structure type. The roomtemperature
modification undergoes a superconducting transition below Tc = 3.3 K. The values of
lower (Hc1 = 32 Oe) and upper (Hc2 = 335 Oe) critical field are rather small, confirming that
this Type II (κG-L = 2.3) weakly coupled (λe-p = 0.5, ΔCe/γnTc = 1.26) superconductor can be
well understood within the Bardeen-Cooper-Schriefer theory. The muon spin relaxation analysis
indicates that the time-reversal symmetry is preserved when the superconducting state is entered,
supporting conventional superconductivity in BeAu.
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Presenters
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Alfred Amon
- MPI-CPfS