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

Parisa Zareapour; Alex Hayat; Shu Yang F. Zhao; Michael Kreshchuk; Yong Kiat Lee; Anjan A. Reijnders; Achint Jain; Zhijun Xu; T. S. Liu; G. D. Gu; Shuang Jia; Robert J. Cava; Kenneth S. Burch

doi:10.1103/PhysRevB.90.241106

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

Parisa Zareapour, Alex Hayat, Shu Yang F. Zhao, Michael Kreshchuk, Yong Kiat Lee, Anjan A. Reijnders, Achint Jain, Zhijun Xu, T. S. Liu, G. D. Gu, Shuang Jia, Robert J. Cava, Kenneth S. Burch

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Abstract

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∼85K) 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.

Original language	English (US)
Article number	241106
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	90
Issue number	24
DOIs	https://doi.org/10.1103/PhysRevB.90.241106
State	Published - Dec 9 2014

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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10.1103/PhysRevB.90.241106

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Zareapour, P., Hayat, A., Zhao, S. Y. F., Kreshchuk, M., Lee, Y. K., Reijnders, A. A., Jain, A., Xu, Z., Liu, T. S., Gu, G. D., Jia, S., Cava, R. J., & Burch, K. S. (2014). Evidence for a new excitation at the interface between a high- Tc superconductor and a topological insulator. Physical Review B - Condensed Matter and Materials Physics, 90(24), Article 241106. https://doi.org/10.1103/PhysRevB.90.241106

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

abstract = "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∼85K) 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.",

author = "Parisa Zareapour and Alex Hayat and Zhao, {Shu Yang F.} and Michael Kreshchuk and Lee, {Yong Kiat} and Reijnders, {Anjan A.} and Achint Jain and Zhijun Xu and Liu, {T. S.} and Gu, {G. D.} and Shuang Jia and Cava, {Robert J.} and Burch, {Kenneth S.}",

note = "Publisher Copyright: {\textcopyright} 2014 American Physical Society.",

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doi = "10.1103/PhysRevB.90.241106",

language = "English (US)",

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Zareapour, P, Hayat, A, Zhao, SYF, Kreshchuk, M, Lee, YK, Reijnders, AA, Jain, A, Xu, Z, Liu, TS, Gu, GD, Jia, S, Cava, RJ & Burch, KS 2014, 'Evidence for a new excitation at the interface between a high- Tc superconductor and a topological insulator', Physical Review B - Condensed Matter and Materials Physics, vol. 90, no. 24, 241106. https://doi.org/10.1103/PhysRevB.90.241106

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T1 - Evidence for a new excitation at the interface between a high- Tc superconductor and a topological insulator

AU - Zareapour, Parisa

AU - Hayat, Alex

AU - Zhao, Shu Yang F.

AU - Kreshchuk, Michael

AU - Lee, Yong Kiat

AU - Reijnders, Anjan A.

AU - Jain, Achint

AU - Xu, Zhijun

AU - Liu, T. S.

AU - Gu, G. D.

AU - Jia, Shuang

AU - Cava, Robert J.

AU - Burch, Kenneth S.

PY - 2014/12/9

Y1 - 2014/12/9

N2 - 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∼85K) 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.

AB - 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∼85K) 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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Evidence for a new excitation at the interface between a high- Tc superconductor and a topological insulator

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