Evidence for a new excitation at the interface between a high-Tc superconductor and a topological insulator

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.

doi:10.1103/PhysRevB.90.241106

Title: Evidence for a new excitation at the interface between a high- $T_{c}$ superconductor and a topological insulator

Journal Article · Tue Dec 09 00:00:00 EST 2014 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PhysRevB.90.241106· OSTI ID:1182522

Zareapour, Parisa ^[1]; Hayat, Alex ^[1]; Zhao, Shu Yang F. ^[1]; Kreshchuk, Michael ^[1]; Lee, Yong Kiat ^[1]; Reijnders, Anjan A. ^[2]; Jain, Achint ^[1]; Xu, Zhijun ^[3]; Liu, T. S. ^[4]; Gu, G. D. ^[3]; Jia, Shuang ^[5]; Cava, Robert J. ^[5]; Burch, Kenneth S. ^[6]

Univ. of Toronto, Toronto, ON (Canada)
Montana Instruments, Bozeman, MT (United States)
Brookhaven National Lab. (BNL), Upton, NY (United States)
Brookhaven National Lab. (BNL), Upton, NY (United States); North Univ. of China (China)
Princeton Univ., Princeton, NJ (United States)
Univ. of Toronto, Toronto, ON (Canada); Boston College, Chestnut Hill, MA (United States)

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 (T_c ~ 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.

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Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC00112704; AC02-98CH10886

OSTI ID:: 1182522

Alternate ID(s):: OSTI ID: 1180972

Report Number(s):: BNL-107520-2015-JA; PRBMDO; R&D Project: PO010; KC0201060

Journal Information:: Physical Review. B, Condensed Matter and Materials Physics, Vol. 90, Issue 24; ISSN 1098-0121

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 9 works

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Title: Evidence for a new excitation at the interface between a high- $T_{c}$ superconductor and a topological insulator