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Here, we report the compelling evidence of ferroelectricity in organic \u03c0-conjugated meta-nitroaniline (m-NA) crystals as shown by the local electromechanical measurements using the piezoresponse force microscopy (PFM) technique. m-NA is a charge-transfer molecular material with the exceptional optical non-linearity and perceptible conductivity along the crystallographic polar axis. While standard Sawyer-Tower measurements revealed an apparently lossy-dielectric hysteresis, The PFM switching spectroscopy indicated clear ferroelectric behaviour in this technologically important multifunctional material. Further study of the pyroelectric properties in m-NA crystals confirmed their high spontaneous polarization of 18\u2009\u03bcC\/cm2 at room temperature, comparable to the best known organic ferroelectrics.<\/jats:p>","DOI":"10.1063\/1.4965710","type":"journal-article","created":{"date-parts":[[2016,10,18]],"date-time":"2016-10-18T17:00:19Z","timestamp":1476810019000},"update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":12,"title":["Probing ferroelectric behaviour in charge-transfer organic meta-nitroaniline"],"prefix":"10.1063","volume":"109","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-3913-8096","authenticated-orcid":false,"given":"Dmitry","family":"Isakov","sequence":"first","affiliation":[{"name":"University of Minho 1 , Centre of Physics, Campus de Gualtar, 4710-057 Braga, Portugal"}]},{"given":"Semen","family":"Vasilev","sequence":"additional","affiliation":[{"name":"Ural Federal University 2 Institute of Natural Sciences and Mathematics, , Lenin Ave. 51, Ekaterinburg 620000, Russia"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0862-1683","authenticated-orcid":false,"given":"Etelvina de Matos","family":"Gomes","sequence":"additional","affiliation":[{"name":"University of Minho 1 , Centre of Physics, Campus de Gualtar, 4710-057 Braga, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7604-0111","authenticated-orcid":false,"given":"Bernardo","family":"Almeida","sequence":"additional","affiliation":[{"name":"University of Minho 1 , Centre of Physics, Campus de Gualtar, 4710-057 Braga, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6970-7798","authenticated-orcid":false,"given":"Vladimir Ya.","family":"Shur","sequence":"additional","affiliation":[{"name":"Ural Federal University 2 Institute of Natural Sciences and Mathematics, , Lenin Ave. 51, Ekaterinburg 620000, Russia"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3432-7610","authenticated-orcid":false,"given":"Andrei L.","family":"Kholkin","sequence":"additional","affiliation":[{"name":"Ural Federal University 2 Institute of Natural Sciences and Mathematics, , Lenin Ave. 51, Ekaterinburg 620000, Russia"},{"name":"University of Aveiro 3 Department of Physics and CICECO\u2014Materials Institute of Aveiro, , 3810-193 Aveiro, Portugal"}]}],"member":"317","published-online":{"date-parts":[[2016,10,18]]},"reference":[{"key":"2023061800594963700_c1","doi-asserted-by":"publisher","first-page":"485","DOI":"10.1038\/nature11395","volume":"488","year":"2013","journal-title":"Nature"},{"key":"2023061800594963700_c2","doi-asserted-by":"publisher","first-page":"1308","DOI":"10.1038\/ncomms2322","volume":"3","year":"2012","journal-title":"Nat. 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