307 citations · 1.1k across the 30 of their papers we have counts for
17 papers · 1 filter
Unconventional fully-gapped superconductivity in the heavy-fermion metal CeCuSi
Michael Smidman, Oliver Stockert, Emilian M. Nica +4
The heavy-fermion metal CeCuSi was the first discovered unconventional, non-phonon-mediated superconductor, and for a long time was believed to exhibit single-band -wave…
Multiple superconducting phases in heavy-fermion metals
Emilian M. Nica, Sheng Ran, Lin Jiao +1
Symmetry breaking beyond a global U(1) phase is the key signature of unconventional superconductors. As prototypical strongly correlated materials, heavy-fermion metals provide ide…
Multiorbital spin-triplet pairing and spin resonance in the heavy-fermion superconductor
Lei Chen, Haoyu Hu, Christopher Lane +3
The heavy-fermion system is a candidate for spin-triplet superconductivity, which is of considerable interest to quantum engineering. Among the outstanding issues…
Superconductivity in a quintuple-layer square-planar nickelate
Grace A. Pan, Dan Ferenc Segedin, Harrison LaBollita +18
Since the discovery of high-temperature superconductivity in the copper oxide materials, there have been sustained efforts to both understand the origins of this phase and discover…
Matrix-pairing states in the alkaline Fe-selenide superconductors: exotic Josephson junctions
Emilian M. Nica, Qimiao Si, Onur Erten
True to their unconventional nature, multi-band alkaline Fe-selenides and, more recently, the heavy-fermion CeCuSi have shown signatures of fully-gapped but sign-changi…
Resonance from antiferromagnetic spin fluctuations for superconductivity in UTe
Chunruo Duan, R. E. Baumbach, Andrey Podlesnyak +7
Superconductivity originates from the formation of bound (Cooper) pairs of electrons that can move through the lattice without resistance below the superconducting transition tempe…
Theory of pairing in mixed-valent correlated metals
Emilian M. Nica, Onur Erten
Motivated by the recent discovery of superconductivity in square-planar nickelates as well as by longstanding puzzling experiments in heavy-fermion superconductors, we study Cooper…
Orbital selectivity in electron correlations and superconducting pairing of iron-based superconductors
Rong Yu, Haoyu Hu, Emilian M. Nica +2
Electron correlations play a central role in iron-based superconductors. In these systems, multiple Fe -orbitals are active in the low-energy physics, and they are not all dege…
Theoretical investigation of superconductivity in trilayer square-planar nickelates
Emilian M. Nica, Jyoti Krishna, Rong Yu +3
The discovery of superconductivity in Sr-doped NdNiO is a crucial breakthrough in the long pursuit for nickel oxide materials with electronic and magnetic properties similar…
Multiorbital singlet pairing and superconductivity
Emilian M. Nica, Qimiao Si
Recent experiments in multiband Fe-based and heavy-fermion superconductors have challenged the long-held dichotomy between simple - and -wave spin-singlet pairing states. Her…
Interacting Majorana fermions in strained nodal superconductors
Emilian M. Nica, Onur Erten
Landau levels (LL) have been predicted to emerge in systems with Dirac nodal points under applied non-uniform strain. We consider 2D, singlet (2D-S) and 3D equ…
Interplay between unconventional superconductivity and heavy-fermion quantum criticality: CeCuSi versus YbRhSi
M. Smidman, O. Stockert, J. Arndt +25
In this paper the low-temperature properties of two isostructural canonical heavy-fermion compounds are contrasted with regards to the interplay between antiferromagnetic (AF) quan…
Landau levels from neutral Bogoliubov particles in two-dimensional nodal superconductors under strain and doping gradients
Emilian M. Nica, Marcel Franz
Motivated by recent work on strain-induced pseudo-magnetic fields in Dirac and Weyl semimetals, we analyze the possibility of analogous fields in two-dimensional nodal superconduct…
Orbital selective pairing and superconductivity in iron selenides
Emilian M. Nica, Rong Yu, Qimiao Si
An important challenge in condensed matter physics is understanding iron-based superconductors. Among these systems, the iron selenides hold the record for highest superconducting…
Fully gapped -wave superconductivity in CeCuSi
G. M. Pang, M. Smidman, J. L. Zhang +13
The nature of the pairing symmetry of the first heavy fermion superconductor CeCuSi has recently become the subject of controversy. While CeCuSi was generally belie…
Orbital selectivity and emergent superconducting state from quasi-degenerate and wave pairing channels in iron-based superconductors
Emilian M. Nica, Rong Yu, Qimiao Si
A major puzzle about the nature of the iron-based superconductivity appears in the case of the alkaline iron selenides. Compared to the iron pnictides, these systems have only elec…
Glide reflection symmetry, Brillouin zone folding and superconducting pairing for the space group
Emilian M. Nica, Rong Yu, Qimiao Si
Motivated by the studies of the superconducting pairing states in the iron-based superconductors, we analyze the effects of Brillouin zone folding procedure from a space group symm…