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Title: Specific heat versus field in the 30 K superconductor BaFe2⁢(As0.7⁢P0.3)2

Journal Article · · Physical Review. B, Condensed Matter and Materials Physics
 [1];  [1];  [1];  [2];  [2];  [2];  [2]
  1. University of Florida, Gainesville, FL (United States)
  2. Kyoto University (Japan)
+ Show Author Affiliations

We report specific heat measurements on the Fe-based superconductor BaFe2(As0.7P0.3)2, a material 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. Here, we discuss possible reasons for this apparent contradiction.

Research Organization:
University of Florida, Gainesville, FL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
FG02-86ER45268; FG02-05ER46236
OSTI ID:
2484125
Journal Information:
Physical Review. B, Condensed Matter and Materials Physics, Journal Name: Physical Review. B, Condensed Matter and Materials Physics Journal Issue: 21 Vol. 81; ISSN 1098-0121
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

References (29)

Bound Fermion states on a vortex line in a type II superconductor journal May 1964
Vortex contribution to specific heat of dirty d-wave superconductors: Breakdown of scaling journal February 1998
BaT2As2 single crystals (T=Fe, Co, Ni) and superconductivity upon Co-doping journal May 2009
Measurement of low‐temperature specific heat journal January 1983
Cascaded Optical Buffer Based on Nonlinear Polarization Rotation in Semiconductor Optical Amplifiers journal October 2008
Specific heat anomalies for T\ll T_{\mathrm {c}} in superconducting single crystal doped BaFe 2 As 2 : comparison of different flux growth methods journal June 2009
Superconductivity up to 30 K in the vicinity of the quantum critical point in BaFe 2 (As 1− x P x ) 2 journal August 2009
Near-degeneracy of several pairing channels in multiorbital models for the Fe pnictides journal February 2009
Gap structure in the electron-doped iron–arsenide superconductor Ba(Fe 0.92 Co 0.08 ) 2 As 2 : low-temperature specific heat study journal February 2010
High-field specific heat of CeCu 2 Si 2 and CeAl 3 journal April 1989
Specific heat of YBa 2 Cu 3 O 7 − δ journal February 1997
Direct observation and anisotropy of the contribution of gap nodes in the low-temperature specific heat of YBa 2 Cu 3 O 7 journal February 2001
Low temperature specific heat of the hole-doped Ba 0.6 K 0.4 Fe 2 As 2 single crystals journal May 2009
Origin of gap anisotropy in spin fluctuation models of the iron pnictides journal June 2009
Pnictogen height as a possible switch between high- T c nodeless and low- T c nodal pairings in the iron-based superconductors journal June 2009
Momentum dependence and nodes of the superconducting gap in the iron pnictides journal October 2009
Functional renormalization-group study of the doping dependence of pairing symmetry in the iron pnictide superconductors journal November 2009
Theory of thermal conductivity in extended- s state superconductors: Application to ferropnictides journal December 2009
P 31 and A 75 s NMR evidence for a residual density of states at zero energy in superconducting BaFe 2 ( As 0.67 P 0.33 ) 2 journal January 2010
Phase diagram and gap anisotropy in iron-pnictide superconductors journal February 2010
Nodes in the gap function of LaFePO, the gap function of the Fe(Se,Te) systems, and the STM signature of the s ± pairing journal May 2010
Evolution from non-Fermi- to Fermi-liquid transport via isovalent doping in BaFe 2 ( As 1 − x P x ) 2 superconductors journal May 2010
Unconventional Pairing Originating from the Disconnected Fermi Surfaces of Superconducting LaFeAsO 1 − x F x journal August 2008
Functional Renormalization-Group Study of the Pairing Symmetry and Pairing Mechanism of the FeAs-Based High-Temperature Superconductor journal January 2009
Unconventional London Penetration Depth in Single-Crystal Ba ( Fe 0.93 Co 0.07 ) 2 As 2 Superconductors journal March 2009
Evolution of the Fermi Surface of BaFe 2 ( As 1 − x P x ) 2 on Entering the Superconducting Dome journal February 2010
Doping Dependence of Heat Transport in the Iron-Arsenide Superconductor Ba ( Fe 1 − x Co x ) 2 As 2 : From Isotropic to a Strongly k -Dependent Gap Structure journal February 2010
Magnetic Field Dependence of the Density of States of Y Ba 2 Cu 3 O 6.95 as Determined from the Specific Heat journal November 1994
To What Extent Iron-Pnictide New Superconductors Have Been Clarified: A Progress Report journal June 2009

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75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY