Media type: E-Article Title: Generation mechanism of negative permittivity and Kramers–Kronig relations in BaTiO3/Y3Fe5O12multiferroic composites Contributor: Wang, Zhongyang; Sun, Kai; Xie, Peitao; Liu, Yao; Fan, Runhua imprint: IOP Publishing, 2017 Published in: Journal of Physics: Condensed Matter Language: Not determined DOI: 10.1088/1361-648x/aa7b5d ISSN: 0953-8984; 1361-648X Origination: Footnote: