Strong-coupling superconductivity in BaPd2As2 induced by soft phonons in the ThCr2Si2-type polymorph

Kazutaka Kudo, Yoshiaki Yamada, Takaaki Takeuchi, Takumi Kimura, Satoshi Ioka, Genta Matsuo, Yutaka Kitahama, Minoru Nohara

Research output: Contribution to journalArticle

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Abstract

The specific heat of two polymorphs of BaPd2As2 was measured. The ThCr2Si2-type polymorph (space group I4/mmm, D17 4h, No. 139) is a previously reported superconductor with a transition temperature Tc ≃ 3:5 K, while the CeMg2Si2-type polymorph (P4/mmm, D1 4h, No. 123) is a normal metal and does not exhibit superconductivity down to 1.8 K. Our results revealed that the ThCr2Si2-type has an anomalously low Debye temperature, indicative of soft phonons, compared to the CeMg2Si2-type. Moreover, a large specific-heat jump at Tc indicated that the superconductivity of ThCr2Si2-type is a strong-coupling type, which is likely derived from soft phonons.

Original languageEnglish
Article number063704
JournalJournal of the Physical Society of Japan
Volume86
Issue number6
DOIs
Publication statusPublished - Jun 15 2017

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phonons
superconductivity
specific heat
transition temperature
metals

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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Strong-coupling superconductivity in BaPd2As2 induced by soft phonons in the ThCr2Si2-type polymorph. / Kudo, Kazutaka; Yamada, Yoshiaki; Takeuchi, Takaaki; Kimura, Takumi; Ioka, Satoshi; Matsuo, Genta; Kitahama, Yutaka; Nohara, Minoru.

In: Journal of the Physical Society of Japan, Vol. 86, No. 6, 063704, 15.06.2017.

Research output: Contribution to journalArticle

Kudo, Kazutaka ; Yamada, Yoshiaki ; Takeuchi, Takaaki ; Kimura, Takumi ; Ioka, Satoshi ; Matsuo, Genta ; Kitahama, Yutaka ; Nohara, Minoru. / Strong-coupling superconductivity in BaPd2As2 induced by soft phonons in the ThCr2Si2-type polymorph. In: Journal of the Physical Society of Japan. 2017 ; Vol. 86, No. 6.
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AU - Kudo, Kazutaka

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AU - Kimura, Takumi

AU - Ioka, Satoshi

AU - Matsuo, Genta

AU - Kitahama, Yutaka

AU - Nohara, Minoru

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AB - The specific heat of two polymorphs of BaPd2As2 was measured. The ThCr2Si2-type polymorph (space group I4/mmm, D17 4h, No. 139) is a previously reported superconductor with a transition temperature Tc ≃ 3:5 K, while the CeMg2Si2-type polymorph (P4/mmm, D1 4h, No. 123) is a normal metal and does not exhibit superconductivity down to 1.8 K. Our results revealed that the ThCr2Si2-type has an anomalously low Debye temperature, indicative of soft phonons, compared to the CeMg2Si2-type. Moreover, a large specific-heat jump at Tc indicated that the superconductivity of ThCr2Si2-type is a strong-coupling type, which is likely derived from soft phonons.

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