Unconventional superconductivity in locally non-centrosymmetric CeNi2As2
Abstract
Recent years have seen intense research on heavy fermion superconductivity, inspired by the discovery of multiple superconducting phases in UTe2 and CeRh2As2. In the latter material, two superconducting phases observed under applied magnetic field oriented along the crystallographic c direction are associated with local inversion symmetry breaking. To advance understanding of these phenomena, it is highly desirable to find further examples of heavy fermion superconductivity in materials with locally non-centrosymmetric structure. We have succeeded in this quest, by growing single crystals of the CaBe2Ge2 isomorph of CeNi2As2. The resulting superconductivity brings more than we had foreseen. In addition to providing the opportunity to compare and contrast with that of CeRh2As2, the condensation occurs from an incoherent normal state quantitatively similar to that of UBe13. Our findings therefore raise profound questions not just about superconductivity in the locally non-centrosymmetric structures, but about unconventional superconductivity itself.
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BibTeX
@misc{morineau2026unconventional,
title = {{Unconventional superconductivity in locally non-centrosymmetric CeNi$_2$As$_2$}},
author = {Félix Morineau and Jan Knapp and Javier Landaeta and Thomas Lühmann and Lea Richter and Petra Knappova and Soumen Ash and Sushma Lakshmi Ravi Sankar and Konstantin Semeniuk and Elena Hassinger and Christoph Geibel and Manuel Brando and Daniel F. Agterberg and Andrew P. Mackenzie and Seunghyun Khim},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.35004},
eprint = {2609.35004},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.35004},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Unconventional superconductivity in locally non-centrosymmetric CeNi_2As_2
AU - Félix Morineau
AU - Jan Knapp
AU - Javier Landaeta
AU - Thomas Lühmann
AU - Lea Richter
AU - Petra Knappova
AU - Soumen Ash
AU - Sushma Lakshmi Ravi Sankar
AU - Konstantin Semeniuk
AU - Elena Hassinger
AU - Christoph Geibel
AU - Manuel Brando
AU - Daniel F. Agterberg
AU - Andrew P. Mackenzie
AU - Seunghyun Khim
PY - 2026
DA - 2026/09/28
PB - arXiv
DO - 10.48550/arxiv.2609.35004
UR - https://arxiv.org/abs/2609.35004
AB - Recent years have seen intense research on heavy fermion superconductivity, inspired by the discovery of multiple superconducting phases in UTe_2 and CeRh_2As_2. In the latter material, two superconducting phases observed under applied magnetic field oriented along the crystallographic c direction are associated with local inversion symmetry breaking. To advance understanding of these phenomena, it is highly desirable to find further examples of heavy fermion superconductivity in materials with locally non-centrosymmetric structure. We have succeeded in this quest, by growing single crystals of the CaBe_2Ge_2 isomorph of CeNi_2As_2. The resulting superconductivity brings more than we had foreseen. In addition to providing the opportunity to compare and contrast with that of CeRh_2As_2, the condensation occurs from an incoherent normal state quantitatively similar to that of UBe_13. Our findings therefore raise profound questions not just about superconductivity in the locally non-centrosymmetric structures, but about unconventional superconductivity itself.
ER -