تقرير
Lifshitz critical point in the cuprate superconductor YBa2Cu3Oy from high-field Hall effect measurements
| العنوان: | Lifshitz critical point in the cuprate superconductor YBa2Cu3Oy from high-field Hall effect measurements |
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| المؤلفون: | LeBoeuf, David, Doiron-Leyraud, Nicolas, Vignolle, B., Sutherland, Mike, Ramshaw, B. J., Levallois, J., Daou, R., Laliberté, Francis, Cyr-Choinière, Olivier, Chang, Johan, Jo, Y. J., Balicas, L., Liang, Ruixing, Bonn, D. A., Hardy, W. N., Proust, Cyril, Taillefer, Louis |
| المصدر: | Phys. Rev. B 83, 054506 (2011) |
| سنة النشر: | 2010 |
| المجموعة: | Condensed Matter |
| مصطلحات موضوعية: | Condensed Matter - Superconductivity, Condensed Matter - Strongly Correlated Electrons |
| الوصف: | The Hall coefficient R_H of the cuprate superconductor YBa2Cu3Oy was measured in magnetic fields up to 60 T for a hole concentration p from 0.078 to 0.152, in the underdoped regime. In fields large enough to suppress superconductivity, R_H(T) is seen to go from positive at high temperature to negative at low temperature, for p > 0.08. This change of sign is attributed to the emergence of an electron pocket in the Fermi surface at low temperature. At p < 0.08, the normal-state R_H(T) remains positive at all temperatures, increasing monotonically as T \to 0. We attribute the change of behaviour across p = 0.08 to a Lifshitz transition, namely a change in Fermi-surface topology occurring at a critical concentration p_L = 0.08, where the electron pocket vanishes. The loss of the high-mobility electron pocket across p_L coincides with a ten-fold drop in the conductivity at low temperature, revealed in measurements of the electrical resistivity $\rho$ at high fields, showing that the so-called metal-insulator crossover of cuprates is in fact driven by a Lifshitz transition. It also coincides with a jump in the in-plane anisotropy of $\rho$, showing that without its electron pocket the Fermi surface must have strong two-fold in-plane anisotropy. These findings are consistent with a Fermi-surface reconstruction caused by a unidirectional spin-density wave or stripe order. Comment: 16 pages, 13 figures, see associated Viewpoint: M. Vojta, Physics 4, 12 (2011) |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1103/PhysRevB.83.054506 |
| URL الوصول: | http://arxiv.org/abs/1009.2078 |
| رقم الأكسشن: | edsarx.1009.2078 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1103/PhysRevB.83.054506 |
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