Blinc, RobertSchmidt, V. Hugo2015-04-172015-04-171984-01R. Blinc and V.H. Schmidt, "Soft modes and proton tunneling in PbHPO4, squaric acid and KH2PO4 type ferroelectrics," Ferroelectric Letters 1, 119-129 (1984)0731-5171https://scholarworks.montana.edu/handle/1/8987It is pointed out that the huge observed differences in the soft mode frequencies of KH2PO4, PbHPO4, CsH2PO4 and squaric acid do not necessarily reflect a large difference in the proton 0—H———O tunneling frequencies but rather result from a difference in the short range correlations renormalizing the single proton O——H—O tunneling frequency.ElectromagneticsChemistryPhysicsMaterials scienceArticle