[HTML][HTML] On the remarkable superconductivity of FeSe and its close cousins

A Kreisel, PJ Hirschfeld, BM Andersen - Symmetry, 2020‏ - mdpi.com
Emergent electronic phenomena in iron-based superconductors have been at the forefront
of condensed matter physics for more than a decade. Much has been learned about the …

Exotic superconducting states in FeSe-based materials

T Shibauchi, T Hanaguri, Y Matsuda - Journal of the Physical Society …, 2020‏ - journals.jps.jp
High-temperature superconductivity and a wide variety of exotic superconducting states
discovered in FeSe-based materials have been at the frontier of research on condensed …

Unusual crossover from Bardeen-Cooper-Schrieffer to Bose-Einstein-condensate superconductivity in iron chalcogenides

Y Mizukami, M Haze, O Tanaka, K Matsuura… - Communications …, 2023‏ - nature.com
Abstract The BCS-BEC (Bardeen-Cooper-Schrieffer–Bose-Einstein-condensate) crossover
from strongly overlap** Cooper pairs to non-overlap** composite bosons in the strong …

Evidence for an Fulde-Ferrell-Larkin-Ovchinnikov state with segmented vortices in the BCS-BEC-crossover superconductor FeSe

S Kasahara, Y Sato, S Licciardello, M Čulo… - Physical review …, 2020‏ - APS
We present resistivity and thermal-conductivity measurements of superconducting FeSe in
intense magnetic fields up to 35 T applied parallel to the ab plane. At low temperatures, the …

High-pressure phase diagrams of FeSe1−xTex: correlation between suppressed nematicity and enhanced superconductivity

K Mukasa, K Matsuura, M Qiu, M Saito… - Nature …, 2021‏ - nature.com
The interplay among magnetism, electronic nematicity, and superconductivity is the key
issue in strongly correlated materials including iron-based, cuprate, and heavy-fermion …

Two distinct superconducting pairing states divided by the nematic end point in FeSe1−xSx

T Hanaguri, K Iwaya, Y Kohsaka, T Machida… - Science …, 2018‏ - science.org
Unconventional superconductivity often competes or coexists with other electronic orders. In
iron-based superconductors, a central issue has been the relationship between …

Pure nematic quantum critical point accompanied by a superconducting dome

K Ishida, Y Onishi, M Tsujii, K Mukasa, M Qiu… - Proceedings of the …, 2022‏ - pnas.org
When a symmetry-breaking phase of matter is suppressed to a quantum critical point (QCP)
at absolute zero, quantum-mechanical fluctuations proliferate. Such fluctuations can lead to …

Two superconducting states with broken time-reversal symmetry in FeSe1−xSx

K Matsuura, M Roppongi, M Qiu, Q Sheng… - Proceedings of the …, 2023‏ - pnas.org
Iron-chalcogenide superconductors FeSe1− x S x possess unique electronic properties such
as nonmagnetic nematic order and its quantum critical point. The nature of superconductivity …

Bose-Einstein condensation superconductivity induced by disappearance of the nematic state

T Hashimoto, Y Ota, A Tsuzuki, T Nagashima… - Science …, 2020‏ - science.org
The crossover from the superconductivity of the Bardeen-Cooper-Schrieffer (BCS) regime to
the Bose-Einstein condensation (BEC) regime holds a key to understanding the nature of …

Highly anisotropic superconducting gap near the nematic quantum critical point of FeSe1−xSx

PK Nag, K Scott, VS de Carvalho, JK Byland, X Yang… - Nature Physics, 2024‏ - nature.com
Nematic phases, in which electrons in a solid spontaneously break rotational symmetry
while preserving translational symmetry, exist in several families of unconventional …