中国物理学会期刊网
Chin. Phys. Lett.  2008, Vol.25 Issue (6): 2221-2224  
Nodal Gap in Fe-Based Layered Superconductor LaO0.9F0.1-δFeAs Probed by Specific Heat Measurements
National Laboratory for Superconductivity, Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, PO Box 603, Beijing 100190

Abstract

We report the specific heat measurements on the newly discovered Fe-based layered LaO0.9F 0.1-δFeAs superconductor with the onset transition temperature Tc≈28K. A nonlinear magnetic field dependence of the electronic specific heat coefficient γ(H) has been found in the low temperature limit, which is consistent with the prediction for a nodal superconductor. The maximum gap value ∆0≈3.4 ±0.5meV is derived by analysing γ(H) based on the d-wave model. We also detected the electronic specific heat difference between 9T and 0T in a wide temperature range, a specific heat anomaly can be clearly observed near Tc. The Debye temperature of our sample is determined to be about 315.7K. Our results suggest an unconventional mechanism for this new superconductor.
收稿日期:2008-04-30

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[英文]
MU Gang, ZHU Xi-Yu, FANG Lei, SHAN Lei, REN Cong, WEN Hai-Hu. Nodal Gap in Fe-Based Layered Superconductor LaO0.9F0.1-δFeAs Probed by Specific Heat Measurements[J]. CPL, 2008, 25(6): 2221-2224.
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[1]
Tsuei C C and Kirtley J R 2000 Rev. Mod. Phys. 72 969 and references therein
[2]
Sigrist M and Ueda K 1991 Rev. Mod. Phys. 63239
[3]
Kopnin N B and Volovik G E 1996 JETP Lett. 64690
[4]
Volovik G E 1993 JETP Lett. 58 469 Volovik G E 1997 JETP Lett. 65 491
[5]
Moler K A et al 1994 Phys. Rev. Lett. 73 2744 Moler K A et al 1997 Phys. Rev. B 55 12753
[6]
Revaz B et al 1998 Phys. Rev. Lett. 80 3364
[7]
Wright D A et al 1999 Phys. Rev. Lett. 821550
[8]
Phillips N E et al 1999 Physica B 259-261 546
[9]
Nohara M et al 2000 J. Phys. Soc. Jpn. 69 1602
[10]
Chen S J et al 1998 Phys. Rev. B 58 R14753
[11]
Wen H H et al 2004 Phys. Rev. B 70 214505 Wen H H et al 2005 Phys. Rev. B 72 134507
[12]
For a review on the low energy quasiparticles, see HusseyN E 2002 Adv. Phys. 51 1685
[13]
Quebe P et al 2000 J. Alloys Compd. 302 72
[14]
Kamihara Y et al 2006 J. Am. Chem. Soc. 12810012
[15]
Watanabe T et al 2007 Inorg. Chem. 46 7719
[16]
Kamihara Y et al 2008 J. Am. Chem. Soc. 1303296
[17]
McMillan W L 1968 Phys. Rev. 167 331
[18]
Wang Y et al 2007 Phys. Rev. B 76 064512
[19]
Chiao M et al 2000 Phys. Rev. B 62 3554
[20]
Vekhter I et al 2001 Phys. Rev. B 64 064513
[21]
Bouquet F et al 2002 Phys. Rev. Lett. 89257001
[22]
Hanagury T et al 2002 Physica B 329 257001
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