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

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The specific heat of two polymorphs of BaPd2As2 was measured. The ThCr2Si2-type polymorph (space group I4/mmm, D174h, No. 139) is a previously reported superconductor with a transition temperature Tc ≃ 3:5 K, while the CeMg2Si2-type polymorph (P4/mmm, D14h, 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
Issue number6
Publication statusPublished - Jun 15 2017

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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