UV resonance Raman studies of Group 6 transition-metal carbonyls: evidence of Jahn-Teller distortion in the excited states of the lowest allowed charge-transfer transitions

1990 ◽  
Vol 94 (10) ◽  
pp. 4055-4060 ◽  
Author(s):  
David. Adelman ◽  
Daniel P. Gerrity
Keyword(s):  
Charge Transfer ◽  
Transition Metal ◽  
Excited States ◽  
Metal Carbonyls ◽  
Teller Distortion ◽  
Uv Resonance Raman ◽  
Charge Transfer Transitions ◽  
Transition Metal Carbonyls ◽  
Jahn Teller ◽  
Jahn Teller Distortion

scholarly journals Chemical Modulation of Local Transition Metal Environment Enables Reversible Oxygen Redox in Mn-Based Layered Cathodes

2021 ◽  
Author(s):  
Muhammad Mominur Rahman ◽  
Scott McGuigan ◽  
Shaofeng Li ◽  
Lina Gao ◽  
Dong Hou ◽  
...  
Keyword(s):  
Transition Metal ◽  
Metal Layer ◽  
Chemical Transformations ◽  
Teller Distortion ◽  
Structural Stabilization ◽  
Factors Affecting ◽  
Jahn Teller ◽  
Chemical Modulation ◽  
Jahn Teller Distortion ◽  
Layered Cathodes

<p>Oxygen redox plays a prominent role in enhancing the energy density of Mn-based layered cathodes. However, understanding the factors affecting the reversibility of oxygen redox is nontrivial due to the complicated concurrent structural and chemical transformations. Herein, we show that local Mn‒O symmetry induced structural and chemical evolutions majorly dictate the reversibility of oxygen redox of Na<sub>x</sub>Li<sub>y</sub>Mn<sub>1-y</sub>O<sub>2</sub> in Na cells. We find that Na<sub>x</sub>Li­<sub>y</sub>Mn<sub>1-y</sub>O<sub>2</sub> with Jahn-Teller distorted MnO<sub>6</sub> octahedra undergoes severe Mn dissolution during cycling, which destabilizes the transition metal layer resulting in poor Li retention and irreversible oxygen redox. Jahn-Teller distortion of MnO<sub>6</sub> octahedra can be suppressed by modulating the local charge of Mn and Mn‒O distance through Mg/Ti dual doping. This leads to reduced Mn dissolution resulting in more reversible oxygen redox. Such stabilization significantly improves the electrochemical performance of Mg/Ti dual doped Na<sub>x</sub>Li<sub>y</sub>Mn<sub>1-y</sub>O<sub>2</sub>. Through this work, we show that promoting reversible oxygen redox can benefit from structural stabilization at local length scale, and that modifying the chemical environment through doping chemistry is an efficient strategy to promote local structural stability and thus, oxygen redox.</p>

Variation of the Jahn–Teller distortion with pressure in perovskite layers A2CuCl4. Influence on the charge-transfer band

2007 ◽  
Vol 244 (1) ◽  
pp. 156-161 ◽  
Author(s):  
F. Rodríguez ◽  
F. Aguado ◽  
R. Valiente ◽  
M. Hanfland ◽  
J. P. Itiè
Keyword(s):  
Charge Transfer ◽  
Charge Transfer Band ◽  
Teller Distortion ◽  
Jahn Teller ◽  
Jahn Teller Distortion

High-Temperature Reorientation Of Distortions In The Excited State Of The VGaTeAs Complexes In n-Type GaAs

1996 ◽  
Vol 442 ◽  
Author(s):  
A. A. Gutkin ◽  
M. A. Reshchikov ◽  
V. E. Sedov
Keyword(s):  
Experimental Data ◽  
Excited State ◽  
Excited States ◽  
Thermal Emission ◽  
Polarized Light ◽  
Dipole Approximation ◽  
Model Parameters ◽  
Teller Distortion ◽  
Jahn Teller ◽  
Jahn Teller Distortion

AbstractWe have investigated polarization of photoluminescence from the VGaTeAs complexes in n-GaAs induced through resonant excitation by polarized light. Experimental data in temperature range from 77 to 240 K were described by classic one-dipole approximation within the model of the VGaTeAs complex subjected to the Jahn-Teller distortion in the ground and excited states. It is shown that depolarization of photoluminescence at temperatures over ∼ 120 K may be explained by concurrent action of i) thermal emission and back capture of holes bound to the complexes in the excited state and ii) reorientation of complex distortion during a life of this state. The model parameters have been estimated.

scholarly journals Nano-imaging of strain-tuned stripe textures in a Mott crystal

2021 ◽  
Vol 6 (1) ◽  
Author(s):  
A. S. McLeod ◽  
A. Wieteska ◽  
G. Chiriaco ◽  
B. Foutty ◽  
Y. Wang ◽  
...  
Keyword(s):  
Transition Metal ◽  
Transition Metal Oxides ◽  
Electrical Current ◽  
Teller Distortion ◽  
Self Organized ◽  
Imaging Results ◽  
Insulator Metal Transition ◽  
Jahn Teller ◽  
Nano Imaging ◽  
Jahn Teller Distortion

AbstractThe 4d transition metal perovskites Can+1RunO3n+1 have attracted interest for their strongly interacting electronic phases showing pronounced sensitivity to controllable stimuli like strain, temperature, and even electrical current. Through multi-messenger low-temperature nano-imaging, we reveal a spontaneous striped texture of coexisting insulating and metallic domains in single crystals of the bilayer ruthenate Ca3(TixRu1-x)2O7 across its first-order Mott transition at $$T \approx 95$$ T ≈ 95 K. We image on-demand anisotropic nucleation and growth of these domains under in situ applied uniaxial strain rationalized through control of a spontaneous Jahn-Teller distortion. Our scanning nano-susceptibility imaging resolves the detailed susceptibility of coexisting phases to strain and temperature at the transition threshold. Comparing these nano-imaging results to bulk-sensitive elastoresistance measurements, we uncover an emergent “domain susceptibility” sensitive to both the volumetric phase fractions and elasticity of the self-organized domain lattice. Our combined susceptibility probes afford nano-scale insights into strain-mediated control over the insulator-metal transition in 4d transition metal oxides.

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