Related Experiment Video
Updated: Mar 19, 2026

Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
Published on: August 2, 2019
Two distinct superconducting phases in LiFeAs
P K Nag1, R Schlegel1, D Baumann1
1IFW Dresden, Institute for Solid State Research, 01171 Dresden, Germany.
Abstract:
A non-trivial temperature evolution of superconductivity including a temperature-induced phase transition between two superconducting phases or even a time-reversal symmetry breaking order parameter is in principle expected in multiband superconductors such as iron-pnictides. Here we present scanning tunnelling spectroscopy data of LiFeAs which reveal two distinct superconducting phases: at = 18 K a partial superconducting gap opens, evidenced by subtle, yet clear features in the tunnelling spectra, i.e. particle-hole symmetric coherence peak and dip-hump structures. At Tc = 16 K, these features substantiate dramatically and become characteristic of full superconductivity. Remarkably, the distance between the dip-hump structures and the coherence peaks remains practically constant in the whole temperature regimeT ≤ . This rules out the connection of the dip-hump structures to an antiferromagnetic spin resonance.
Related Concept Videos
Types Of Superconductors
Superconductor
Phase Transitions
Phase Transitions
Phase Transitions: Melting and Freezing
Phase Transitions: Sublimation and Deposition

