Superconducting Density of States of PtPb4

PtPb4 is a type II superconductor with a bulk critical temperature Tc ≈ 3 K and an upper critical field of Hc2 = 0.36T. PtPb4 is related to non-superconducting PtSn4, which presents nodal arc states at the surface. Here, we measure the superconducting density of states of PtPb4 using millikelvin Sca...

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Autores: García Talavera, Pablo, Moreno Flores, José Antonio, Herrera Vasco, Edwin, Buzdin, Alexander I., Bud’ko, Sergey, Canfield, Paul C., Guillamón Gómez, Isabel, Suderow Rodríguez, Hermann Jesús
Tipo de recurso: artículo
Fecha de publicación:2025
País:España
Institución:Universidad Autónoma de Madrid
Repositorio:Biblos-e Archivo. Repositorio Institucional de la UAM
Idioma:inglés
OAI Identifier:oai:repositorio.uam.es:10486/720047
Acceso en línea:http://hdl.handle.net/10486/720047
https://dx.doi.org/10.1007/s10948-025-06995-8
Access Level:acceso abierto
Palabra clave:Superconductivity
Critical temperature
Twinning planes
Binary intermetallic compounds
Scanning Tunneling Microscopy
Very low temperatures
Física
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spelling Superconducting Density of States of PtPb4García Talavera, PabloMoreno Flores, José AntonioHerrera Vasco, EdwinBuzdin, Alexander I.Bud’ko, SergeyCanfield, Paul C.Guillamón Gómez, IsabelSuderow Rodríguez, Hermann JesúsSuperconductivityCritical temperatureTwinning planesBinary intermetallic compoundsScanning Tunneling MicroscopyVery low temperaturesFísicaPtPb4 is a type II superconductor with a bulk critical temperature Tc ≈ 3 K and an upper critical field of Hc2 = 0.36T. PtPb4 is related to non-superconducting PtSn4, which presents nodal arc states at the surface. Here, we measure the superconducting density of states of PtPb4 using millikelvin Scanning Tunneling Microscopy (STM). We observe a fully opened superconducting gap of = 0.48 meV similar to expectations from Bardeen, Cooper and Schrieffer (BCS) theory (0 = 1.76kB Tc = 0.49 meV). Measurements under magnetic fields applied perpendicular to the surface show a spatially inhomogeneous gap structure, presenting superconducting signatures at fields as high as 1.5 T, significantly above Hc2 = 0.36 T. On some locations, we find that the superconducting density of states does not vanish above Tc. We can find signatures of a superconducting gap up to 5 K. We discuss possible reasons for the observation of superconducting properties above Tc andHc2, emphasizing the role played by structural defectsWe acknowledge support by the Spanish State Research Agency (PID2020-114071RB-I00, PID2023-150148OB-I00, CEX2023-001316-M, TED2021-130546B-I00), by the Comunidad de Madrid through program NMag4TIC-CM (Program No. TEC2024/TEC-380), and PhD thesis support (PIPF-2023/TEC-30683), and by EU (VectorFieldImaging Grant Agreement 101069239, ISABEL project under Grant Agreement No 871106 and COST superqumap CA21144). We acknowledge the QUASURF project (SI4/PJI/2024- 00062) funded by the Comunidad de Madrid through the agreement to promote and encourage research and technology transfer at the Universidad Autónoma de Madrid. Segainvex and Sidi at UAM, Madrid, are acknowledged for help in STM construction and sample characterization. Work done at Ames Laboratory was supported by the U.S. Department of Energy, Office of Basic Energy Science, Division of Materials Sciences and Engineering. Ames Laboratory is operated for the U.S. Department of Energy by Iowa State University under Contract No. DE-AC02-07CH11358SpringerDepartamento de Física de la Materia CondensadaFacultad de Ciencias20252025-05-30research articlehttp://purl.org/coar/resource_type/c_2df8fbb1VoRhttp://purl.org/coar/version/c_970fb48d4fbd8a85info:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10486/720047https://dx.doi.org/10.1007/s10948-025-06995-8reponame:Biblos-e Archivo. Repositorio Institucional de la UAMinstname:Universidad Autónoma de MadridInglésengopen accesshttp://purl.org/coar/access_right/c_abf2Attribution 4.0 Internationalhttp://creativecommons.org/licenses/by/4.0/info:eu-repo/semantics/openAccessoai:repositorio.uam.es:10486/7200472026-06-23T12:46:27Z
dc.title.none.fl_str_mv Superconducting Density of States of PtPb4
title Superconducting Density of States of PtPb4
spellingShingle Superconducting Density of States of PtPb4
García Talavera, Pablo
Superconductivity
Critical temperature
Twinning planes
Binary intermetallic compounds
Scanning Tunneling Microscopy
Very low temperatures
Física
title_short Superconducting Density of States of PtPb4
title_full Superconducting Density of States of PtPb4
title_fullStr Superconducting Density of States of PtPb4
title_full_unstemmed Superconducting Density of States of PtPb4
title_sort Superconducting Density of States of PtPb4
dc.creator.none.fl_str_mv García Talavera, Pablo
Moreno Flores, José Antonio
Herrera Vasco, Edwin
Buzdin, Alexander I.
Bud’ko, Sergey
Canfield, Paul C.
Guillamón Gómez, Isabel
Suderow Rodríguez, Hermann Jesús
author García Talavera, Pablo
author_facet García Talavera, Pablo
Moreno Flores, José Antonio
Herrera Vasco, Edwin
Buzdin, Alexander I.
Bud’ko, Sergey
Canfield, Paul C.
Guillamón Gómez, Isabel
Suderow Rodríguez, Hermann Jesús
author_role author
author2 Moreno Flores, José Antonio
Herrera Vasco, Edwin
Buzdin, Alexander I.
Bud’ko, Sergey
Canfield, Paul C.
Guillamón Gómez, Isabel
Suderow Rodríguez, Hermann Jesús
author2_role author
author
author
author
author
author
author
dc.contributor.none.fl_str_mv Departamento de Física de la Materia Condensada
Facultad de Ciencias
dc.subject.none.fl_str_mv Superconductivity
Critical temperature
Twinning planes
Binary intermetallic compounds
Scanning Tunneling Microscopy
Very low temperatures
Física
topic Superconductivity
Critical temperature
Twinning planes
Binary intermetallic compounds
Scanning Tunneling Microscopy
Very low temperatures
Física
description PtPb4 is a type II superconductor with a bulk critical temperature Tc ≈ 3 K and an upper critical field of Hc2 = 0.36T. PtPb4 is related to non-superconducting PtSn4, which presents nodal arc states at the surface. Here, we measure the superconducting density of states of PtPb4 using millikelvin Scanning Tunneling Microscopy (STM). We observe a fully opened superconducting gap of = 0.48 meV similar to expectations from Bardeen, Cooper and Schrieffer (BCS) theory (0 = 1.76kB Tc = 0.49 meV). Measurements under magnetic fields applied perpendicular to the surface show a spatially inhomogeneous gap structure, presenting superconducting signatures at fields as high as 1.5 T, significantly above Hc2 = 0.36 T. On some locations, we find that the superconducting density of states does not vanish above Tc. We can find signatures of a superconducting gap up to 5 K. We discuss possible reasons for the observation of superconducting properties above Tc andHc2, emphasizing the role played by structural defects
publishDate 2025
dc.date.none.fl_str_mv 2025
2025-05-30
dc.type.none.fl_str_mv research article
http://purl.org/coar/resource_type/c_2df8fbb1
VoR
http://purl.org/coar/version/c_970fb48d4fbd8a85
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv http://hdl.handle.net/10486/720047
https://dx.doi.org/10.1007/s10948-025-06995-8
url http://hdl.handle.net/10486/720047
https://dx.doi.org/10.1007/s10948-025-06995-8
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
Attribution 4.0 International
http://creativecommons.org/licenses/by/4.0/
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
Attribution 4.0 International
http://creativecommons.org/licenses/by/4.0/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Springer
publisher.none.fl_str_mv Springer
dc.source.none.fl_str_mv reponame:Biblos-e Archivo. Repositorio Institucional de la UAM
instname:Universidad Autónoma de Madrid
instname_str Universidad Autónoma de Madrid
reponame_str Biblos-e Archivo. Repositorio Institucional de la UAM
collection Biblos-e Archivo. Repositorio Institucional de la UAM
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,811543

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