The melting of the cooperative Jahn-Teller distortion (cJTd) in KCu1−xMgxF3 has been studied by high-resolution x-ray powder diffraction. A first-order phase transition relaxing the cJTd is detected at temperatures increasing monotonically with x. From the transition temperatures, an estimate of the cJTd stabilization energy is derived and found to be linearly increasing with x. By extrapolating to x=0, the cJTd energy in the parent compound KCuF3 is determined. It is argued how, in the light of current theories, the cJTd rather than orbital polarization controls the peculiar physics of KCuF3
Experimental disentangling of orbital and lattice energy scales by inducing cooperative Jahn-Teller melting in KCu1−xMgxF3 solid solutions / P. Ghigna, M. Scavini, C. Mazzoli, M. Brunelli, C. Laurenti, C. Ferrero. - In: PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS. - ISSN 1098-0121. - 81:7(2010), pp. 073107.73107-073107.73111.
Experimental disentangling of orbital and lattice energy scales by inducing cooperative Jahn-Teller melting in KCu1−xMgxF3 solid solutions
M. ScaviniSecondo
;
2010
Abstract
The melting of the cooperative Jahn-Teller distortion (cJTd) in KCu1−xMgxF3 has been studied by high-resolution x-ray powder diffraction. A first-order phase transition relaxing the cJTd is detected at temperatures increasing monotonically with x. From the transition temperatures, an estimate of the cJTd stabilization energy is derived and found to be linearly increasing with x. By extrapolating to x=0, the cJTd energy in the parent compound KCuF3 is determined. It is argued how, in the light of current theories, the cJTd rather than orbital polarization controls the peculiar physics of KCuF3Pubblicazioni consigliate
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