تقرير
Gaps and pseudo-gaps at the Mott quantum Critical point in the perovskite rare earth nickelates
| العنوان: | Gaps and pseudo-gaps at the Mott quantum Critical point in the perovskite rare earth nickelates |
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| المؤلفون: | Allen, S. James, Hauser, Adam J., Mikheev, Evgeny, Zhang, Jack Y., Moreno, Nelson E., Son, Junwoo, Ouellette, Daniel G., Kally, James, Kozhanov, Alex, Balents, Leon, Stemmer, Susanne |
| سنة النشر: | 2014 |
| المجموعة: | Condensed Matter |
| مصطلحات موضوعية: | Condensed Matter - Strongly Correlated Electrons |
| الوصف: | We report on tunneling measurements that reveal for the first time the evolution of the quasi-particle state density across the bandwidth controlled Mott metal to insulator transition in the rare earth perovskite nickelates. In this, a canonical class of transition metal oxides, we study in particular two materials close to the T=0 metal-insulator transition: NdNiO3 , an antiferromagnetic insulator, and LaNiO3, a correlated metal. We measure a sharp gap in NdNiO3, which has an insulating ground state, of ~ 30 meV. Remarkably, metallic LaNiO3 exhibits a pseudogap of the same order that presages the metal insulator transition. The smallness of both the gap and pseudogap suggests they arise from a common origin: proximity to a quantum critical point at or near the T=0 metal-insulator transition. It also supports theoretical models of the quantum phase transition in terms of spin and charge instabilities of an itinerant Fermi surface. Comment: 5 figures, 22 pages |
| نوع الوثيقة: | Working Paper |
| URL الوصول: | http://arxiv.org/abs/1404.2544 |
| رقم الأكسشن: | edsarx.1404.2544 |
| قاعدة البيانات: | arXiv |
| الوصف غير متاح. |