TY - JOUR
T1 - Electron–phonon coupling in superconducting 1T-PdTe2
AU - Anemone, Gloria
AU - Casado Aguilar, Pablo
AU - Garnica, Manuela
AU - Calleja, Fabian
AU - Al Taleb, Amjad
AU - Kuo, Chia Nung
AU - Lue, Chin Shan
AU - Politano, Antonio
AU - Vázquez de Parga, Amadeo L.
AU - Benedek, Giorgio
AU - Farías, Daniel
AU - Miranda, Rodolfo
N1 - Funding Information:
Work partially supported by the Ministerio de Economía y Competitividad (MINECO) projects MAT2015–65356–C3–3–R and FIS2015–67367 C2–1–P, the Ministerio de Ciencia, Innovación y Universidades projects PGC2018–093291–B–I00, PGC2018-097028–A–I00, PGC2018-098613–B–C21 and PID2019-109525RB-I00 and the Comunidad de Madrid (CM) projects Nanomag COST-CM,P2018/NMAT-4321 and NMAT2D-CM P2018/NMT-4511. We acknowledge financial support from the Spanish Ministry of Science and Innovation, through project PID2019–109525RB–I00 and the "María de Maeztu" Programme for Units of Excellence in R&D (CEX2018–000805–M). IMDEA Nanociencia acknowledges support from the ’Severo Ochoa’ Programme for Centres of Excellence in R&D (MINECO, Grant SEV-2016-0686). M.G. has received financial support through the Postdoctoral Junior Leader Fellowship Programme from "la Caixa” Banking Foundation.
Publisher Copyright:
© 2021, The Author(s).
PY - 2021/12
Y1 - 2021/12
N2 - We have determined the electron–phonon interaction in type II Dirac semimetallic 1T-PdTe2 by means of helium atom scattering. While 1T-PdTe2 is isostructural with 1T-PtTe2, only the former is superconductor. The difference can be traced to the substantially larger value of the electron–phonon coupling in 1T-PdTe2, λ = 0.58, obtained from the Debye-Waller attenuation of the He specular peak. With this value and the surface Debye temperature, ΘD = 106.2 K, we have figured out the superconducting critical temperature, Tc = 1.83 K given by the BCS theory, which is in good agreement with Tc = (1.95 ± 0.03) K obtained with low-temperature scanning tunneling microscopy. The value of the effective mass related to ΘD indicates that the large electron–phonon coupling in 1T-PdTe2 is due to coupling, not only with the zone-center optical mode O2 at 9.2 meV, as proposed in a recent theoretical study, but also with the zone-boundary acoustic mode LA. Our results suggest that the topological states of a Dirac cone play a negligible role on the onset of superconductivity.
AB - We have determined the electron–phonon interaction in type II Dirac semimetallic 1T-PdTe2 by means of helium atom scattering. While 1T-PdTe2 is isostructural with 1T-PtTe2, only the former is superconductor. The difference can be traced to the substantially larger value of the electron–phonon coupling in 1T-PdTe2, λ = 0.58, obtained from the Debye-Waller attenuation of the He specular peak. With this value and the surface Debye temperature, ΘD = 106.2 K, we have figured out the superconducting critical temperature, Tc = 1.83 K given by the BCS theory, which is in good agreement with Tc = (1.95 ± 0.03) K obtained with low-temperature scanning tunneling microscopy. The value of the effective mass related to ΘD indicates that the large electron–phonon coupling in 1T-PdTe2 is due to coupling, not only with the zone-center optical mode O2 at 9.2 meV, as proposed in a recent theoretical study, but also with the zone-boundary acoustic mode LA. Our results suggest that the topological states of a Dirac cone play a negligible role on the onset of superconductivity.
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U2 - 10.1038/s41699-021-00204-5
DO - 10.1038/s41699-021-00204-5
M3 - Article
AN - SCOPUS:85101663566
VL - 5
JO - npj 2D Materials and Applications
JF - npj 2D Materials and Applications
SN - 2397-7132
IS - 1
M1 - 25
ER -