Lifting of Gap Nodes by Disorder in Tetragonal Superconductors

T Nagashima, K Ishihara, K Imamura, M Kobayashi… - Physical Review Letters, 2024 - APS
The observation of time-reversal symmetry breaking and large residual density of states in
tetragonal FeSe 1-x S x suggests a novel type of ultranodal superconducting state with …

Unconventional localization of electrons inside of a nematic electronic phase

LS Farrar, Z Zajicek, AB Morfoot… - Proceedings of the …, 2022 - National Acad Sciences
The magnetotransport behavior inside the nematic phase of bulk FeSe reveals unusual
multiband effects that cannot be reconciled with a simple two-band approximation proposed …

Multiband description of the upper critical field of bulk FeSe

M Bristow, A Gower, JCA Prentice, MD Watson… - Physical Review B, 2023 - APS
The upper critical field of multiband superconductors can be an essential quantity to unravel
the nature of superconducting pairing and its interplay with the electronic structure. Here we …

Cometal Addition Effect on Superconducting Properties and Granular Behaviours of Polycrystalline FeSe0.5Te0.5

M Manasa, M Azam, T Zajarniuk, R Diduszko, T Cetner… - Materials, 2023 - mdpi.com
The enhanced performance of superconducting FeSe0. 5Te0. 5 materials with added micro-
sized Pb and Sn particles is presented. A series of Pb-and Sn-added FeSe0. 5Te0. 5 …

Comparison of Gd addition effect on the superconducting properties of FeSe0. 5Te0. 5 bulks under ambient and high-pressure conditions

M Manasa, M Azam, T Zajarniuk, R Diduszko… - Ceramics …, 2024 - Elsevier
We have prepared a series of (FeSe 0.5 Te 0.5+ xGd) bulk samples, with x= 0, 0.03, 0.05,
0.07, 0.1 and 0.2, through the convenient solid-state reaction method at ambient pressure …

Resurgence of superconductivity and the role of dxy hole band in FeSe1−xTex

AB Morfoot, TK Kim, MD Watson… - Communications …, 2023 - nature.com
Iron-chalcogenide superconductors display rich phenomena caused by orbital-dependent
band shifts and electronic correlations. Additionally, they are potential candidates for …

Effect of Pb addition on microstructure, transport properties, and the critical current density in a polycrystalline FeSe0.5Te0.5

SJ Singh, R Diduszko, P Iwanowski, T Cetner… - Applied Physics A, 2022 - Springer
We have investigated the effects of lead (Pb) additions (x) up to 40 wt%(x= 0–0.4) on the
structure, electrical properties, and magnetic properties of FeSe0. 5Te0. 5 superconductor …

Robust superconductivity and fragile magnetism induced by the strong Cu impurity scattering in the high-pressure phase of FeSe

Z Zajicek, SJ Singh, AI Coldea - Physical Review Research, 2022 - APS
Superconductivity in FeSe is strongly enhanced under applied pressure and it is proposed
to emerge from anomalously coupled structural and magnetic phases. Small impurities …

Collapse of metallicity and high-Tc superconductivity in the high-pressure phase of FeSe0.89S0.11

P Reiss, A McCollam, Z Zajicek, AA Haghighirad… - npj Quantum …, 2024 - nature.com
We investigate the high-pressure phase of the iron-based superconductor FeSe0. 89S0. 11
using transport and tunnel diode oscillator studies using diamond anvil cells. We construct …

Lifting of gap nodes by disorder in ultranodal superconductor candidate FeSe1-xSx

T Nagashima, K Ishihara, K Imamura… - arXiv preprint arXiv …, 2024 - arxiv.org
The observation of time-reversal symmetry breaking and large residual density of states in
tetragonal FeSe $ _ {1-x} $ S $ _x $ suggests a novel type of ultranodal superconducting …