Evidence of unconventional superconductivity on the surface of the nodal semimetal CaAg1−xPdxP

Rikizo Yano (), Shota Nagasaka, Naoki Matsubara, Kazushige Saigusa, Tsuyoshi Tanda, Seiichiro Ito, Ai Yamakage, Yoshihiko Okamoto (), Koshi Takenaka and Satoshi Kashiwaya ()
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Rikizo Yano: Nagoya University
Shota Nagasaka: Nagoya University
Naoki Matsubara: Nagoya University
Kazushige Saigusa: Nagoya University
Tsuyoshi Tanda: Nagoya University
Seiichiro Ito: Nagoya University
Ai Yamakage: Nagoya University
Yoshihiko Okamoto: Nagoya University
Koshi Takenaka: Nagoya University
Satoshi Kashiwaya: Nagoya University

Nature Communications, 2023, vol. 14, issue 1, 1-6

Abstract: Abstract Surface states of topological materials provide extreme electronic states for unconventional superconducting states. CaAg1−xPdxP is an ideal candidate for a nodal-line Dirac semimetal with drumhead surface states and no additional bulk bands. Here, we report that CaAg1−xPdxP has surface states that exhibit unconventional superconductivity (SC) around 1.5 K. Extremely sharp magnetoresistance, tuned by surface-sensitive gating, determines the surface origin of the ultrahigh-mobility “electrons.” The Pd-doping elevates the Fermi level towards the surface states, and as a result, the critical temperature (Tc) is increased up to 1.7 K from 1.2 K for undoped CaAgP. Furthermore, a soft point-contact study at the surface of Pd-doped CaAgP proved the emergence of unconventional SC on the surface. We observed the bell-shaped conductance spectra, a hallmark of the unconventional SC. Ultrahigh mobility carriers derived from the surface flat bands generate a new class of unconventional SC.

Date: 2023
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DOI: 10.1038/s41467-023-42535-5

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