TY - JOUR
T1 - Specific heat versus field in the 30 K superconductor BaFe 2(As0.7P0.3)2
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
N2 - 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.
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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U2 - 10.1103/PhysRevB.81.214507
DO - 10.1103/PhysRevB.81.214507
M3 - Article
AN - SCOPUS:77955880327
SN - 1098-0121
VL - 81
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
IS - 21
M1 - 214507
ER -