New results for superconductivity inκ-(BEDT-TTF)2Cu(NCS)2 when an applied magnetic field is aligned parallel to the conducting planes
Superconductivity And Other Properties
Using a Tunnel Diode Oscillator technique, we have measured the effect of a parallel magnetic field on the in-plane rf penetration depths in organic [α-(BEDT-TTF)2NH4Hg(SCN)4 and k-(BEDT-TTF)2Cu(NCS)2] and heavy fermion (CeCoIn5) superconductors. We show that in this particular geometry, the effects due to vortex activity are minimized. The penetration depth is then governed by the density of superconducting carriers. It is shown in many experiments including rf penetration depth measurement that α-(BEDT-TTF)2NH4Hg(SCN)4 and CeCoIn5 have s-wave and d-wave pairing symmetries, respectively. The pairing symmetry of k-(BEDT-TTF)2-Cu(NCS)2, however, is still an unsolved matter, showing inconsistent results. In this paper, the penetration depth of k-(BEDT-TTF)2Cu(NCS)2 is shown to be more similar to α-(BEDT-TTF)2NH4Hg(SCN)4 than to CeCoIn5, suggesting the pairing is nodeless.
PACS numbers74.70Kn 74.25.Dw 74.20.Rp 74.25.Nf
Y. Nakazawa and K. Kanoda,Physica (Amsterdam)
, 1897 (1997).ADSGoogle Scholar
S. Belin, K. Behnia, and A. Deluzet,Phys. Rev. Lett.
, 4728 (1998).CrossRefADSGoogle Scholar
S. Lefebvre et al.,Phys. Rev. Lett.
, 5420 (2000).CrossRefADSGoogle Scholar
D. R. Harshman et al.,Phys. Rev. Lett.
, 1293 (1990).CrossRefADSGoogle Scholar
M. Lang et al.,Phys. Rev. Lett.
, 1443 (1992).CrossRefADSGoogle Scholar
A. Carrington at al.,Phys. Rev. Lett.
, 4172 (1999).CrossRefADSGoogle Scholar
K. Kanoda et al.,Phys. Rev. Lett.
, 1271 (1990).CrossRefADSGoogle Scholar
L. P. Le et al.,Phys. Rev. Lett.
, 1923 (1992).CrossRefADSGoogle Scholar
D. Achikir et al.,Phys. Rev. B
, 11595 (1993).CrossRefADSGoogle Scholar
P. A. Mansky et al.,Phys. Rev. B
, 15929 (1994).CrossRefADSGoogle Scholar
Y. Nakazawa et al.,Phys. Rev. B
, 12890 (1995).CrossRefADSGoogle Scholar
R. Movshovich, et al.,Phys. Rev. Lett.
, 5152 (2001).CrossRefADSGoogle Scholar
C. T. Van Degrift,Rev. Sci. Instrum.
, 599 (1975).CrossRefADSGoogle Scholar
T. Coffey et al.,Rev. Sci. Instrum.
, 4600 (2000).CrossRefADSGoogle Scholar
M. W. Coffey and J. R. Clem,Phys. Rev. Lett
, 386 (1991).CrossRefADSGoogle Scholar
E. H. Brandt,Phys. Rev. Lett.
, 2219 (1991).CrossRefADSGoogle Scholar
C. Martin et al.,Phys. Rev. B
, 020503 (2005).CrossRefADSGoogle Scholar
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