Specific heat versus field in the 30 K superconductor BaFe 2(As0.7P0.3)2

J. S. Kim; P. J. Hirschfeld; G. R. Stewart; S. Kasahara; T. Shibauchi; T. Terashima; Y. Matsuda

doi:10.1103/PhysRevB.81.214507

Specific heat versus field in the 30 K superconductor BaFe ₂(As_0.7P_0.3)₂

J. S. Kim, P. J. Hirschfeld, G. R. Stewart, S. Kasahara, T. Shibauchi, T. Terashima, Y. Matsuda

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36 Citations (Scopus)

Abstract

We report specific-heat measurements on well characterized single crystals of the Fe-based superconductor BaFe₂( As_0.7P _0.3)₂, from the same batch on which previous penetration depth, NMR, and thermal-conductivity measurements have observed a high density of low-energy excitations, which have been interpreted in terms of order-parameter nodes. Within the resolution of our measurements, the low-temperature limiting C/T is found to be linear in field, i.e., we find no evidence for a Volovik effect associated with nodal quasiparticles in either the clean or dirty limit. We discuss possible reasons for this apparent contradiction, which may be an intrinsic feature of the multiple Fermi-surface sheets present in the iron pnictide superconductors.

Original language	English
Article number	214507
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	81
Issue number	21
DOIs	https://doi.org/10.1103/PhysRevB.81.214507
Publication status	Published - Jun 4 2010
Externally published	Yes

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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10.1103/PhysRevB.81.214507

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abstract = "We report specific-heat measurements on well characterized single crystals of the Fe-based superconductor BaFe2( As0.7P 0.3)2, from the same batch on which previous penetration depth, NMR, and thermal-conductivity measurements have observed a high density of low-energy excitations, which have been interpreted in terms of order-parameter nodes. Within the resolution of our measurements, the low-temperature limiting C/T is found to be linear in field, i.e., we find no evidence for a Volovik effect associated with nodal quasiparticles in either the clean or dirty limit. We discuss possible reasons for this apparent contradiction, which may be an intrinsic feature of the multiple Fermi-surface sheets present in the iron pnictide superconductors.",

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AU - Kim, J. S.

AU - Hirschfeld, P. J.

AU - Stewart, G. R.

AU - Kasahara, S.

AU - Shibauchi, T.

AU - Terashima, T.

AU - Matsuda, Y.

PY - 2010/6/4

Y1 - 2010/6/4

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AB - We report specific-heat measurements on well characterized single crystals of the Fe-based superconductor BaFe2( As0.7P 0.3)2, from the same batch on which previous penetration depth, NMR, and thermal-conductivity measurements have observed a high density of low-energy excitations, which have been interpreted in terms of order-parameter nodes. Within the resolution of our measurements, the low-temperature limiting C/T is found to be linear in field, i.e., we find no evidence for a Volovik effect associated with nodal quasiparticles in either the clean or dirty limit. We discuss possible reasons for this apparent contradiction, which may be an intrinsic feature of the multiple Fermi-surface sheets present in the iron pnictide superconductors.

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Specific heat versus field in the 30 K superconductor BaFe ₂(As_0.7P_0.3)₂

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