Observation of Coexisting Weak Localization and Superconducting Fluctuations in Strained Sn_1-InTe Thin Films

Area of Science:

• Condensed Matter Physics
• Materials Science
• Quantum Computing

Background:

• Topological superconductors are promising for hosting Majorana zero modes crucial for topological quantum computing.
• Understanding the electronic properties of candidate materials under specific growth and strain conditions is essential.

Purpose of the Study:

• To investigate quantum interference effects and superconducting fluctuations in strained Sn_1-InTe thin films.
• To analyze the normal state magnetoresistance to understand the origin of superconductivity.
• To re-examine the pairing symmetry of the material under quantum confinement and lattice strain.

Main Methods:

• Growth of Sn_1-InTe thin films (0 < x < 0.3) using molecular beam epitaxy.
• Application of (111) plane strain to the thin films.
• Analysis of normal state magnetoresistance to identify quantum interference effects.
• Observation of conductivity enhancements above the critical temperature (Tc).

Main Results:

• Observed quantum interference effects coexisting with superconducting fluctuations above Tc.
• Consistent crossover from weak antilocalization to localization in superconducting samples.
• Indication that superconductivity originates from trivial, strongly spin-orbit split charge carrier states.
• Significant enhancement of conductivity above Tc, confirming superconducting fluctuations.

Conclusions:

• The study reveals complex electronic behaviors in strained Sn_1-InTe thin films, including quantum interference and significant superconducting fluctuations.
• Results suggest superconductivity in this system stems from trivial states, challenging previous assumptions.
• The findings necessitate a re-evaluation of the pairing symmetry in topological superconductor thin films subjected to strain and quantum confinement.