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Title: Evidence for a new excitation at the interface between a high- T c superconductor and a topological insulator

Abstract

In this research, high-temperature superconductors exhibit a wide variety of novel excitations. If contacted with a topological insulator, the lifting of spin rotation symmetry in the surface states can lead to the emergence of unconventional superconductivity and novel particles. In pursuit of this possibility, we fabricated high critical-temperature (Tc ~ 85 K) superconductor/topological insulator (Bi₂Sr₂CaCu₂O₈₊δ/Bi₂Te₂Se) junctions. Below 75 K, a zero-bias conductance peak (ZBCP) emerges in the differential conductance spectra of this junction. The magnitude of the ZBCP is suppressed at the same rate for magnetic fields applied parallel or perpendicular to the junction. Furthermore, it can still be observed and does not split up to at least 8.5 T. The temperature and magnetic field dependence of the excitation we observe appears to fall outside the known paradigms for a ZBCP.

Authors:
 [1];  [1];  [1];  [1];  [1];  [2];  [1];  [3];  [4];  [3];  [5];  [5];  [6]
+ Show Author Affiliations
  1. Univ. of Toronto, Toronto, ON (Canada)
  2. Montana Instruments, Bozeman, MT (United States)
  3. Brookhaven National Lab. (BNL), Upton, NY (United States)
  4. Brookhaven National Lab. (BNL), Upton, NY (United States); North Univ. of China (China)
  5. Princeton Univ., Princeton, NJ (United States)
  6. Univ. of Toronto, Toronto, ON (Canada); Boston College, Chestnut Hill, MA (United States)
Publication Date:
Research Org.:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1182522
Alternate Identifier(s):
OSTI ID: 1180972
Report Number(s):
BNL-107520-2015-JA
Journal ID: ISSN 1098-0121; PRBMDO; R&D Project: PO010; KC0201060
Grant/Contract Number:  
SC00112704; AC02-98CH10886
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review. B, Condensed Matter and Materials Physics
Additional Journal Information:
Journal Volume: 90; Journal Issue: 24; Journal ID: ISSN 1098-0121
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Zareapour, Parisa, Hayat, Alex, Zhao, Shu Yang F., Kreshchuk, Michael, Lee, Yong Kiat, Reijnders, Anjan A., Jain, Achint, Xu, Zhijun, Liu, T. S., Gu, G. D., Jia, Shuang, Cava, Robert J., and Burch, Kenneth S. Evidence for a new excitation at the interface between a high-Tc superconductor and a topological insulator. United States: N. p., 2014. Web. doi:10.1103/PhysRevB.90.241106.
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Zareapour, Parisa, Hayat, Alex, Zhao, Shu Yang F., Kreshchuk, Michael, Lee, Yong Kiat, Reijnders, Anjan A., Jain, Achint, Xu, Zhijun, Liu, T. S., Gu, G. D., Jia, Shuang, Cava, Robert J., & Burch, Kenneth S. Evidence for a new excitation at the interface between a high-Tc superconductor and a topological insulator. United States. https://doi.org/10.1103/PhysRevB.90.241106
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Zareapour, Parisa, Hayat, Alex, Zhao, Shu Yang F., Kreshchuk, Michael, Lee, Yong Kiat, Reijnders, Anjan A., Jain, Achint, Xu, Zhijun, Liu, T. S., Gu, G. D., Jia, Shuang, Cava, Robert J., and Burch, Kenneth S. Tue . "Evidence for a new excitation at the interface between a high-Tc superconductor and a topological insulator". United States. https://doi.org/10.1103/PhysRevB.90.241106. https://www.osti.gov/servlets/purl/1182522.
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@article{osti_1182522,
title = {Evidence for a new excitation at the interface between a high-Tc superconductor and a topological insulator},
author = {Zareapour, Parisa and Hayat, Alex and Zhao, Shu Yang F. and Kreshchuk, Michael and Lee, Yong Kiat and Reijnders, Anjan A. and Jain, Achint and Xu, Zhijun and Liu, T. S. and Gu, G. D. and Jia, Shuang and Cava, Robert J. and Burch, Kenneth S.},
abstractNote = {In this research, high-temperature superconductors exhibit a wide variety of novel excitations. If contacted with a topological insulator, the lifting of spin rotation symmetry in the surface states can lead to the emergence of unconventional superconductivity and novel particles. In pursuit of this possibility, we fabricated high critical-temperature (Tc ~ 85 K) superconductor/topological insulator (Bi₂Sr₂CaCu₂O₈₊δ/Bi₂Te₂Se) junctions. Below 75 K, a zero-bias conductance peak (ZBCP) emerges in the differential conductance spectra of this junction. The magnitude of the ZBCP is suppressed at the same rate for magnetic fields applied parallel or perpendicular to the junction. Furthermore, it can still be observed and does not split up to at least 8.5 T. The temperature and magnetic field dependence of the excitation we observe appears to fall outside the known paradigms for a ZBCP.},
doi = {10.1103/PhysRevB.90.241106},
journal = {Physical Review. B, Condensed Matter and Materials Physics},
number = 24,
volume = 90,
place = {United States},
year = {Tue Dec 09 00:00:00 EST 2014},
month = {Tue Dec 09 00:00:00 EST 2014}
}
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https://doi.org/10.1103/PhysRevB.90.241106
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    Works referencing / citing this record:

    Fabricating Nanogaps in YBa 2 Cu 3 O 7 − δ for Hybrid Proximity-Based Josephson Junctions
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