| Autor: |
Ryotaro Sekine, Denholme, Saleem J., Akio Tsukada, Susumu Kawashima, Mitsumasa Minematsu, Takashi Inose, Satoshi Mikusu, Kazuyasu Tokiwa, Tsuneo Watanabe, Nobuaki Miyakawa |
| Zdroj: |
Journal of the Physical Society of Japan; 2016, Vol. 85 Issue 2, p1-7, 7p |
| Abstrakt: |
We report the temperature dependence of tunneling conductance from 5 to 190K for overdoped TlBa2Ca2Cu3O8.5+δ (Tl1223) with TC ~ 112 K. The tunneling conductances exhibit clear dips at a voltage, Vdip, below TC, suggesting that the dip is of superconducting origin. Moreover, we have found that the mode energy Ω is 38 meV and independent of temperature, where Ω is defined as the difference between eVdip and the superconducting gap Δ. In addition, the temperature dependence of the tunneling dip strength is similar to that of the magnetic resonance intensity at (π, π) observed in inelastic neutron scattering experiments. We found that the relationship between the average mode energy ... and Δ for Tl1223 is a common feature of Bi2Sr2CaCu2O8+δ, where .../Δ increases with decreasing Δ, but does not exceed 2. These characteristic features of the tunneling dips are consistent with not only those of resonance spin excitation but also pairing models in which the (π, π) resonance is a collective spin excitation. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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