Low-Temperature Penetration Depth ofκ−(ET)2Cu[N(CN)2]Brandκ−(ET)2Cu(NCS)2
| Autor: | Aravinda M. Kini, Russell W Giannetta, John A. Schlueter, Urs Geiser, A. Carrington, Ruslan Prozorov, Ismardo Bonalde, Hau H. Wang, Jack M. Williams |
|---|---|
| Rok vydání: | 1999 |
| Předmět: | |
| Zdroj: | Physical Review Letters. 83:4172-4175 |
| ISSN: | 1079-7114 0031-9007 |
| DOI: | 10.1103/physrevlett.83.4172 |
| Popis: | We present high-precision measurements of the penetration depth of single crystals of $\ensuremath{\kappa}\ensuremath{-}(\mathrm{ET}{)}_{2}\mathrm{Cu}[\mathrm{N}(\mathrm{CN}{)}_{2}]\mathrm{Br}$ and $\ensuremath{\kappa}\ensuremath{-}(\mathrm{ET}{)}_{2}\mathrm{Cu}(\mathrm{NCS}{)}_{2}$ at temperatures down to 0.4 K. We find that, at low temperatures, the in-plane penetration depth $({\ensuremath{\lambda}}_{\ensuremath{\parallel}})$ varies as a fractional power law, ${\ensuremath{\lambda}}_{\ensuremath{\parallel}}\ensuremath{\sim}{T}^{\frac{3}{2}}$. While this may be taken as evidence for novel pair excitation processes, we show that the data are also consistent with a quasilinear variation of the superfluid density, as is expected for a $d$-wave superconductor with impurities or a small residual gap. Our data for the interplane penetration depth show similar features and give a direct measurement of the absolute value, ${\ensuremath{\lambda}}_{\ensuremath{\perp}}(0)\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}100\ifmmode\pm\else\textpm\fi{}20\ensuremath{\mu}\mathrm{m}$. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|