Field-induced quantum critical route to a Fermi liquid in high-temperature superconductors
| Autor: | Shibauchi, T., Krusin-Elbaum, L., Hasegawa, M., Kasahara, Y., Okazaki, R., Matsuda, Y. |
|---|---|
| Rok vydání: | 2008 |
| Předmět: | |
| Zdroj: | Proc. Natl. Acad. Sci. USA 105, 7120-7123 (2008). |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1073/pnas.0712292105 |
| Popis: | In high transition temperature (T_c) superconductivity, charge doping is a natural tuning parameter that takes copper oxides from the antiferromagnet to the superconducting region. In the metallic state above T_c the standard Landau's Fermi-liquid theory of metals as typified by the temperature squared (T^2) dependence of resistivity appears to break down. Whether the origin of the non-Fermi-liquid behavior is related to physics specific to the cuprates is a fundamental question still under debate. We uncover a new transformation from the non-Fermi- to a standard Fermi-liquid state driven not by doping but by magnetic field in the overdoped high-T_c superconductor Tl_2Ba_2CuO_{6+x}. From the c-axis resistivity measured up to 45 T, we show that the Fermi-liquid features appear above a sufficiently high field which decreases linearly with temperature and lands at a quantum critical point near the superconductivity's upper critical field -- with the Fermi-liquid coefficient of the T^2 dependence showing a power-law diverging behavior on the approach to the critical point. This field-induced quantum criticality bears a striking resemblance to that in quasi-two dimensional heavy-Fermion superconductors, suggesting a common underlying spin-related physics in these superconductors with strong electron correlations. Comment: 6 pages, 4 figures |
| Databáze: | arXiv |
| Externí odkaz: |
|