Comment on "Low-temperature ordered states of RBa2Cu3O7- delta due to dipole-dipole and exchange interactions"

Abstract

In a recent paper Misra and Felsteiner calculate the low-temperature ordered states of certain R${\mathrm{Ba}}_{2}$${\mathrm{Cu}}_{3}$${\mathrm{O}}_{7\mathrm{\ensuremath{-}}\mathrm{\ensuremath{\delta}}}$ compounds, using the Luttinger-Tisza method. Based on the results of these calculations the authors conclude that dipolar interactions alone can account for all the observed orderings of these materials. However, the calculations and the conclusions drawn from these calculations are based on assumptions that we believe are inconsistent with many crystal electric field measurements in the R${\mathrm{Ba}}_{2}$${\mathrm{Cu}}_{3}$${\mathrm{O}}_{7\mathrm{\ensuremath{-}}\mathrm{\ensuremath{\delta}}}$ compounds.