Critical behavior of KDCO3 from 2H and 39K single crystal NMR

✍ Scribed by Christophe Odin

• Book ID: 102527706
• Publisher: John Wiley and Sons
• Year: 2007
• Tongue: English
• Weight: 442 KB
• Volume: 46
• Category: Article
• ISSN: 0749-1581
• DOI: 10.1002/mrc.2112

✦ Synopsis

Abstract

Potassium hydrogenocarbonate KDCO~3~ presents an order/disorder phase transition at T~c~≈ 353 K. The critical behavior of this phase transition was studied by single crystal ^2^H and ^39^K NMR. The evolution of the order parameter as a function of temperature is quantified, and the critical exponent was determined, indicating a transition close to a tricritical point. The ^2^H Zeeman relaxation rate is strongly increased near the transition temperature. By calculating the noncritical contribution to the Zeeman relaxation rate, we show that the observed relaxation rate clearly presents a pseudo‐divergent behavior near T~c~, with a logarithmic singularity. The nature of the phase transition is discussed in the light of these results. Copyright © 2007 John Wiley & Sons, Ltd.