Dielectric spectroscopy study of crystallization kinetics of N-(4-nitrophenyl)-(L)-prolinol glass

Abstract

Two-step kinetic crystallization processes from the glass-like disordered state of N-(4-nitrophenyl)-(L)-prolinol have been found during the monitoring of the time evolution of dielectric strength and these are discussed within steady state theory. The dynamics of structure relaxation in the disordered state have been investigated by broadband dielectric spectroscopy. The temperature dependence of the relaxation times is described by the Vogel-Fulcher equation with an anomalous pre-exponential parameter. The anomaly is discussed within the framework of the two-order parameter model of glass formation proposed by H Tanaka (1999 J. Chem. Phys. 111 3163; 1998 J. Phys.: Condens. Matter 10 L207).

Tuning Stoichiometry for Enhanced Spin‐Charge Interconversion in Transition Metal Oxides

“…[30][31][32] To this end, there is tremendous on-going research focused on tuning the spin-to-charge conversion efficiency and electrical resistivity in oxides, which together determine the figureof-merit for the spin-current source and detector. To date, current approaches mainly rely on engineering the crystalline structure of oxide films by epitaxy strain, [8,25,26,33] substrate orientation, [10][11][12] interfacial geometry coupling, [13] and postannealing. [6] In transition metal oxides, the off-stoichiometry is another common but important phenomenon, which has been widely observed in titanates, [34] cobaltates, [35] ruthenates, [36][37][38][39][40][41] iridates, [42,43] etc.…”