scholarly journals Spin Crossover and Magnetic-Dielectric Bistability Induced by Hidden Pseudo-Jahn–Teller Effect

2020 ◽  
Vol 6 (4) ◽  
pp. 64
Author(s):  
Isaac B. Bersuker

In a semi-review paper, we show that the hidden Jahn–Teller effect (JTE) and pseudo-JTE (PJTE) in molecular systems and solids, under certain conditions lead to the formation of two coexisting stable space configurations with different magnetic and dielectric properties, switchable by external perturbations. One of the stable configurations has a high space symmetry and a non-zero or higher spin (HS) (non-zero magnetic moment), the other being distorted, but with zero or lower spin (LS). The number of systems with hidden JTE or PJTE is innumerable; we demonstrate this on the (no exhaustible, too) group of systems with half-filed closed-shell degenerate electronic (orbital or band) configurations e2 and t3. The spin-crossover-change from the high symmetry HS arrangement to the low-symmetry LS geometry is accompanied by (driven by the PJTE) orbital disproportionation, in which the system prefers spins-paired states with two electrons on the same orbital (and lower symmetry charge distribution) over the Hund’s spin-parallel arrangement involving several orbitals. Ab initio calculations previously carried out on a series of molecular systems and clusters in crystals, including CuF3, Si3, Si4, Ge4, C4H4, Na4−, C603−, CuO6 (in two crystal environments, LiCuO2 and NaCuO2), etc., confirmed the general theory and allowed for estimates of the parameter values including relaxation times. The hidden JTE and PJTE are thus general tools for search and studies of polyatomic systems with bistabilities.

2006 ◽  
Vol 125 (10) ◽  
pp. 104102 ◽  
Author(s):  
P. Garcia-Fernandez ◽  
Isaac B. Bersuker ◽  
James E. Boggs

2021 ◽  
Vol 2131 (5) ◽  
pp. 052088
Author(s):  
T Khudaiberganov ◽  
D Bukharov ◽  
S Arakelian

Abstract We present new mechanism of the charge transport in thin films based on coherent migration of the deformation of the nanoclusters potential, which carries with it an electron. We represent correlation between deformation and charges as the distorton-inverson quasiparticle. This effect is based on the inversion of the potential energy of nanoclusters due to the Jahn-Teller effect in a nanocluster, when charges flow in a network of nanoclusters. The distorton-inverson is quasiparticle are consisted the distorton and electron or hole, this quasiparticle similar an inverson in the Watkins effect. A distorton is quasiparticle which appears itself in the effects of deformation of the potential of the nanocluster with not closed shell. This quasiparticle is similar a defecton in the Watkins effect. We are calculated transmission spectrum and dispersion properties this quasiparticle.


2009 ◽  
Vol 164 (2) ◽  
pp. 132-137
Author(s):  
Fevzi Köksal ◽  
Dilek Demir ◽  
Rahmi Köseoğlu

1994 ◽  
Vol 55 (8) ◽  
pp. 727-735 ◽  
Author(s):  
M. Salagram ◽  
T.S.N. Murthy ◽  
K. Madhukar ◽  
C.S. Sunandana

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