Observation of superconductivity and its enhancement at the charge density wave critical point in LaAgSb2

Kazuto Akiba; Nobuaki Umeshita; Tatsuo C. Kobayashi

doi:10.1103/PhysRevB.106.L161113

Observation of superconductivity and its enhancement at the charge density wave critical point in LaAgSb2

Kazuto Akiba, Nobuaki Umeshita, Tatsuo C. Kobayashi

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1 Citation (Scopus)

Abstract

We discover superconductivity (SC) in LaAgSb2 at ambient pressure and its close correlation with a charge density wave (CDW) under pressure. The superconducting transition temperature (Tc) exhibits a sharp peak at a CDW critical pressure of 3.2 GPa. We demonstrate that the carriers inhabiting the Sb-square net are crucial not only in the formation of CDW but also in SC for their relatively strong electron-phonon coupling (EPC). Furthermore, theoretical EPC strength in pristine LaAgSb2 cannot explain the observed peak with Tc∼1 K, which indicates that an additional mechanism reinforces SC only around the CDW critical pressure.

Original language	English
Article number	L161113
Journal	Physical Review B
Volume	106
Issue number	16
DOIs	https://doi.org/10.1103/PhysRevB.106.L161113
Publication status	Published - Oct 15 2022

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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title = "Observation of superconductivity and its enhancement at the charge density wave critical point in LaAgSb2",

abstract = "We discover superconductivity (SC) in LaAgSb2 at ambient pressure and its close correlation with a charge density wave (CDW) under pressure. The superconducting transition temperature (Tc) exhibits a sharp peak at a CDW critical pressure of 3.2 GPa. We demonstrate that the carriers inhabiting the Sb-square net are crucial not only in the formation of CDW but also in SC for their relatively strong electron-phonon coupling (EPC). Furthermore, theoretical EPC strength in pristine LaAgSb2 cannot explain the observed peak with Tc∼1 K, which indicates that an additional mechanism reinforces SC only around the CDW critical pressure.",

author = "Kazuto Akiba and Nobuaki Umeshita and Kobayashi, {Tatsuo C.}",

note = "Funding Information: We thank J. Otsuki and H. Harima for valuable discussion and comments. This research was supported by JSPS KAKENHI Grants No. JP19K14660, No. JP21H01042, and No. JP22K14006. Publisher Copyright: {\textcopyright} 2022 American Physical Society.",

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AU - Umeshita, Nobuaki

AU - Kobayashi, Tatsuo C.

N1 - Funding Information: We thank J. Otsuki and H. Harima for valuable discussion and comments. This research was supported by JSPS KAKENHI Grants No. JP19K14660, No. JP21H01042, and No. JP22K14006. Publisher Copyright: © 2022 American Physical Society.

PY - 2022/10/15

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N2 - We discover superconductivity (SC) in LaAgSb2 at ambient pressure and its close correlation with a charge density wave (CDW) under pressure. The superconducting transition temperature (Tc) exhibits a sharp peak at a CDW critical pressure of 3.2 GPa. We demonstrate that the carriers inhabiting the Sb-square net are crucial not only in the formation of CDW but also in SC for their relatively strong electron-phonon coupling (EPC). Furthermore, theoretical EPC strength in pristine LaAgSb2 cannot explain the observed peak with Tc∼1 K, which indicates that an additional mechanism reinforces SC only around the CDW critical pressure.

AB - We discover superconductivity (SC) in LaAgSb2 at ambient pressure and its close correlation with a charge density wave (CDW) under pressure. The superconducting transition temperature (Tc) exhibits a sharp peak at a CDW critical pressure of 3.2 GPa. We demonstrate that the carriers inhabiting the Sb-square net are crucial not only in the formation of CDW but also in SC for their relatively strong electron-phonon coupling (EPC). Furthermore, theoretical EPC strength in pristine LaAgSb2 cannot explain the observed peak with Tc∼1 K, which indicates that an additional mechanism reinforces SC only around the CDW critical pressure.

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Observation of superconductivity and its enhancement at the charge density wave critical point in LaAgSb2

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