Wednesday, December 10, 2014

Abstract-Observation and Structural Control of Charge-Density-Waves resonating with Terahertz Frequencies in NdNiO3
Formation of charge-density-waves in ordered electronic phases (such as charge-order) is an emergent phenomenon in the perovskite class of correlated oxides. This scenario is visualized to prevail in exotic RNiO3 (R=rare-earth) nickelates in which the structure controls the incipient charge-order to form in weak localization limit. However, any consequent effect demonstrating these nickelates in rare category of charge-density-waves conductors with controlled charge-lattice interactions has been a fundamental challenge so-far. Here, we present first evidence of the charge-density-waves in a prototypical NdNiO3 system employing terahertz time-domain spectroscopy along selective crystal axes. A finite peak structure at 5meV in the terahertz conductivity displays all the characteristics of a charge-density-wave condensate. Contrasting charge-dynamics of collective charge-density-waves mode and Drude conductivity emerging, respectively, from orthorhombic and cubic symmetries disentangle charge-ordering from the insulating state, establish a novel structure-property cause-effect relationship, and present opportunities to harness these diverse attributes in oxide electronics.
Subjects:Strongly Correlated Electrons (cond-mat.str-el)
Cite as:arXiv:1412.3244 [cond-mat.str-el]
 (or arXiv:1412.3244v1 [cond-mat.str-el] for this version)

Submission history

From: Rakesh Rana [view email]
[v1] Wed, 10 Dec 2014 10:12:40 GMT (1766kb)

No comments: