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Updated: Mar 8, 2026
08:53
Angle-resolved Photoemission Spectroscopy At Ultra-low Temperatures
Published on: October 9, 2012
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Spectroscopic evidence of odd frequency superconducting order
Avradeep Pal1, J A Ouassou2, M Eschrig3
1Department of Materials Science, University of Cambridge, 27 Charles Babbage Road, Cambridge CB3 0FS, United Kingdom.
Scientific Reports
|January 21, 2017
Summary
Spin filter superconducting junctions exhibit a significant Zero Bias Conductance Peak (ZBCP) at low temperatures. This anomaly indicates unconventional superconductivity and signals an odd frequency superconducting order.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Quantum Phenomena
Background:
- Superconducting tunnel junctions are crucial for studying superconductivity.
- Zero Bias Conductance Peaks (ZBCP) can indicate unconventional superconducting states.
- Understanding novel superconducting orders is key to advancing quantum technologies.
Purpose of the Study:
- To investigate the nature of superconductivity in spin filter S/I/N tunnel junctions.
- To analyze the origin of the pronounced Zero Bias Conductance Peak (ZBCP).
- To identify signatures of unconventional superconducting orders.
Main Methods:
- Fabrication of niobium nitride/gadolinium nitride/titanium nitride (NbN/GdN/TiN) superconducting tunnel junctions.
- Low-temperature electrical transport measurements.
- Analysis of conductance anomalies, specifically the Zero Bias Conductance Peak (ZBCP).
Main Results:
- Observed a robust and significant Zero Bias Conductance Peak (ZBCP) in NbN/GdN/TiN junctions at low temperatures.
- The ZBCP magnitude was several times the normal state conductance.
- The ZBCP demonstrated a characteristic signature of unconventional superconductivity.
Conclusions:
- The observed ZBCP is a direct signature of an odd frequency superconducting order.
- Spin filter junctions provide a platform for exploring exotic superconducting states.
- Findings contribute to the fundamental understanding of unconventional superconductivity.
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