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Time-reversal symmetry breaking in frustrated superconductor ReHf
Manasi Manda, Anshu Kataria, Chandan Patra +5
Geometrical frustration leads to novel quantum phenomena such as the spin-liquid phase in triangular and Kagomé lattices. Intra-band and inter-band Fermi surface (FS) nesting can d…
SR study of unconventional pairing symmetry in the quasi-1D NaCrAs superconductor
A Bhattacharyya, D T Adroja, Y Feng +4
We report the finding of a novel pairing state in a newly discovered superconductor NaCrAs. This material has a noncentrosymmetric quasi-one-dimensional crystal structu…
Spectroscopic evidence of multi-gap superconductivity in non-centrosymmetric AuBe
Soumya Datta, Aastha Vasdev, Partha Sarathi Rana +5
AuBe is a chiral, non-centrosymmetric superconductor with transition temperature 3.25 K. The broken inversion symmetry in its crystal structure makes AuBe a possible…
Superconductivity in Infinite-layer Nickelates : Role of Non-zero f-ness
Subhadeep Bandyopadhyay, Priyo Adhikary, Tanmoy Das +2
Employing first-principles density functional theory calculations and Wannierization of the low energy band structure, we analyze the electronic structure of undoped, infinite-laye…
Orbital Selective Superconductivity in a Two-band Model of Infinite-Layer Nickelates
Priyo Adhikary, Subhadeep Bandyopadhyay, Tanmoy Das +2
In the present study, we explore superconductivity in NdNiO and LaNiO employing a first-principles derived low-energy model Hamiltonian, consisting of two orbitals: Ni $x^{…
Prediction of -wave pairing symmetry in YBaCuO cuprates
Priyo Adhikary, Tanmoy Das
We perform a numerical simulation of a three-band Hubbard model with two CuO planes and a single CuO chain layer for YBCO cuprates. The spin-fluctuation mediated pairing intera…
Reciprocity between local moments and collective magnetic excitations in the phase diagram of BaFe(AsP)
Jonathan Pelliciari, Kenji Ishii, Yaobo Huang +12
Unconventional superconductivity arises at the border between the strong coupling regime with local magnetic moments and the weak coupling regime with itinerant electrons, and stem…
Spin-orbit driven spin depolarization in the ferromagnetic Weyl semimetal Co3Sn2S2
Sandeep Howlader, Surabhi Saha, Ritesh Kumar +4
CoSnS has recently emerged as a ferromagnetic Weyl semi-metal. Theoretical investigation of the spin-split bands predicted half metalicity in the compound. Here, we rep…
Novel attractive pairing interaction in strongly correlated superconductors
Priyo Adhikary, Tanmoy Das
Conventional and unconventional superconductivity, respectively, arise from attractive (electron-phonon) and repulsive (many-body Coulomb) interactions with fixed-sign and sign-rev…
Investigation of Superconducting Gap Structure in HfIrSi using muon spin relaxation/rotation
A. Bhattacharyya, K. Panda, D. T. Adroja +6
Appearance of strong spin-orbit coupling (SOC) is apparent in ternary equiatomic compounds with 5-electrons due to the large atomic radii of transition metals. SOC plays a signi…
Probing the superconducting ground state of ZrIrSi: A SR study
K. Panda, A. Bhattacharyya, D. T. Adroja +6
The superconducting ground state of newly reported ZrIrSi is probed by means of SR technique along with resistivity measurement. The occurrence of superconductivity at $T_\mathr…
Evidence of Nodal Line in the Superconducting Gap Symmetry of Noncentrosymmetric ThCoC
A. Bhattacharyya, D. T. Adroja, K. Panda +7
The newly discovered noncentrosymmetric superconductor ThCoC exhibits numerous unconventional behavior in the field dependent heat capacity data. Here we present the first me…
Multi-band superconductivity driven by a site-selective mechanism in MoGa
Anshu Sirohi, Surabhi Saha, Prakriti Neha +4
The family of the endohedral gallide cluster compounds recently emerged as a new family of superconductors which is expected to host systems displaying unconventional physics. Mo$_…
Mixed type I and type II superconductivity due to intrinsic electronic inhomogeneities in the type II Dirac semimetal PdTe2
Anshu Sirohi, Shekhar Das, Rajeswari Roy Chowdhuri +4
The type II Dirac semimetal PdTe is unique in the family of topological parent materials because it displays a superconducting ground state below 1.7 K. Despite wide speculatio…
Direct Evidence for Time-Reversal Symmetry Breaking in Topological Superconductor Sr0.1Bi2Se3
P. Neha, P. K. Biswas, Tanmoy Das +1
The single helical Fermi surface on the surface state of three-dimensional topological insulator Bi2Se3 is constrained by the time-reversal invariant bulk topology to possess a spi…
Wannier Pairs in the Superconducting Twisted Bilayer Graphene and Related Systems
Sujay Ray, Jeil Jung, Tanmoy Das
Unconventional superconductivity often arises from Cooper pairing between neighboring atomic sites, stipulating a characteristic pairing symmetry in the reciprocal space. The twist…
Theory of superconductivity with non-Hermitian and parity-time reversal symmetric cooper pairing symmetry
Ananya Ghatak, Tanmoy Das
Recently developed parity (P) and time-reversal (T) symmetric non-Hermitian systems govern a rich variety of new and characteristically distinct physical properties, which may or m…
Intra-layer doping effects on the high-energy magnetic correlations in NaFeAs
Jonathan Pelliciari, Yaobo Huang, Tanmoy Das +8
We have used Resonant Inelastic X-ray Scattering (RIXS) and dynamical susceptibility calculations to study the magnetic excitations in NaFeCoAs (x = 0, 0.03, and 0.08).…
Unusual Dirac fermions on the surface of noncentrosymmetric - BiPd superconductor
S. Thirupathaiah, Soumi Ghosh, Rajveer Jha +8
Combining multiple emergent correlated properties such as superconductivity and magnetism within the topological matrix can have exceptional consequences in garnering new and exoti…
Quantum oscillations from `open' Fermi surface in quasi-one-dimensional lattices: Application to YBa2Cu3O6 cuprates, organic salts, ladder compounds, and related systems
Pranoy S. Varma, Tanmoy Das
According to the celebrated Onsagar-Lifshitz paradigm, the observation of Shubnikov de-Haas and de-Haas van Alphen (SdHvA) oscillations is an indication of the presence of `closed'…
Two types of superconducting domes in unconventional superconductors
Tanmoy Das, Christos Panagopoulos
Uncovering the origin of unconventional superconductivity is often plagued by the overwhelming material diversity with varying normal and superconducting (SC) properties. In this a…
Superconducting dome in MoS2 and TiSe2 generated by quasiparticle-phonon coupling
Tanmoy Das, Kapildeb Dolui
We use a first-principles based self-consistent momentum-resolved density fluctuation (MRDF) model to compute the combined effects of electron-electron and electron-phonon interact…
Intermediate Coupling Model of the Cuprates
Tanmoy Das, R. S. Markiewicz, A. Bansil
We review the intermediate coupling model for treating electronic correlations in the cuprates. Spectral signatures of the intermediate coupling scenario are identified and used to…
Nodeless superconducting gap induced by odd parity pair density wave in underdoped cuprates
Tanmoy Das
We present a theoretical model to show that the transition from an antiferromagnetic (AFM) phase to the -wave superconductivity occurs through a robust companion of a…