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Phase Transitions
A Multinational Journal
Volume 80, 2007 - Issue 6-7: Special Issue of Phase Transitions dedicated to Professor Jerzy A. Janik from the H. Niewodniczań ski Institute of Nuclear Physics, Polish Academy of Sciences, Poland, on his eightieth birthday
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Original Articles

Phase transition induced by orbital dynamics in YBa2Cu3Ox

J. Stankowski Institute of Molecular Physics, Polish Academy of Sciences, ul. M. Smoluchowskiego 17, 60-179 PoznańCorrespondence[email protected]
,
A. ŚlĄzak Department of Molecular Physics, Technical University of Lodz, ul. Żeromskiego 116, 90-924 Lodz
&
L. Piekara-Sady Institute of Molecular Physics, Polish Academy of Sciences, ul. M. Smoluchowskiego 17, 60-179 Poznań
Pages 559-562 | Received 19 Feb 2007, Accepted 22 Feb 2007, Published online: 04 Dec 2010
 
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Abstract

Chemically induced dynamical Jahn-Taller (CDJT), averaging the g-factor on cooling, below T orb, due to topological transformation from the CuO4 complex to CuO5 state, has been shown in several experiments. The change in order parameter E of spin paramagnetism at T orb was observed. Above T orb a typical antiferromagnetic temperature dependence, with Curie--Weiss temperature Θ < 0, was observed. Below T orb the orbital excitation destroys the antiferromagnetic order and gives rise to a Θ of 0 K.

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