ࡱ> @B?`0k"bjbjss @*    8R 4 0 $h. Q P~  :M, > Dy ,f0. R  v/TDHR $  COMPLEX AND NONLINEAR DYNAMICS IN THE ORGANIC CRYSTALS WITH CHARGE AND MAGNETIC ORDERS T. Ivek1, M.Pinteric1,2, I.Kovacevic1, B.Korin-Hamzic1, S. Tomic1, M.Dressel3, D.Schweitzer3 1Institut za fiziku, P.O.Box 304, HR-10001 Zagreb, Croatia stomic@ifs.hr 2Faculty of Civil Engineering, Smetanova 17, 2000 Maribor, Slovenia 31. Physikalisches Institut, Universitt Stuttgart, Pfaffenwaldring 57, D-70550 Stuttgart, Germany A variety of organics with reduced dimensionality and strong Coulomb interactions display novel forms of ordering phenomena. These broken-symmetry phases and their excitations have attracted much attention. We overview complex conductivity and electric-field dependent measurements of two representative quasi-2D organic systems. (BEDT-TTF)2I3 presents one of the most prominent examples of charge order (CO). Below the CO phase transition at 136 K into the insulating and diamagnetic ground state, two dielectric relaxation modes appear in the kHz-MHz range. The large mode features an anisotropic phason-like behavior, while the small mode presents a soliton-like behavior. The observed type of excitations fit well into the most relevant picture of this CO as a cooperative bond charge density wave with ferroelectric-like features [1]. On the other hand, puzzling results including negative differential resistance and voltage oscillations were recently reported under application of high dc electric fields [2]. Our carefully designed electric-field-dependent measurements of conductivity anisotropy within the molecular plane qualitatively confirmed these findings; moreover they revealed novel intriguing behaviors not observed until now [3]. k-(BEDT-TTF)2Cu[N(CN)2]Cl is a Mott insulator with antiferromagnetic transition at 27K and spins canting developed at long range scales below 22K. Previously reported dielectric relaxation has been attributed to a charge-domain wall dynamics within a random ferromagnetic domain structure [4]. Recently, the existence of a charge order with electronic ferroelectricity has been proposed and suggested to be intimately coupled with the stabilization of the magnetic ground state [5]. Motivated by this suggestion, we have revisited our dielectric relaxation data. We have not found an experimental evidence of a sharp, well defined ferroelectric transition. Rather, our samples displayed a broad dielectric relaxation which persisted well above magnetic transition VWX_`lo|}ɿsi^PChjh eKOJQJaJh^@h eKH*OJQJaJh^@H*OJQJaJh^@OJQJaJhjh eK>*H*OJQJaJh eK>*OJQJaJhQH*OJQJaJh}h eKOJQJaJh}h eKH*OJQJaJh eKH*OJQJaJh eKOJQJaJhh eKH*OJQJaJhh eKOJQJaJhB(h eK;hh eK5;\h eK5;\WXD  V!gdj8$a$gdO,gdns$[$\$a$gd.$a$gdns $da$gd eK$a$gd eK$a$gd eKgd eK $^a$gd eK $ a$gd eK]"j"  C D E 0 X ƸsaMB>:>626h~h4h/hQEhQh eKmHsH'hQh eK6CJOJQJaJmHsH"hQh eK6CJ]aJmHsHhQh eK6CJaJmHsH"hQh eK6CJH*aJmHsHh eK6CJ\]aJmH sH %hD6>h eK6CJ\]aJmH sH hnh eK6CJH*aJh eK6CJaJhX3h eKCJOJQJaJh{h eK6CJOJQJaJ"h{h eK6CJH*OJQJaJ  2 6      B F H R U Z e f o F :]^÷ïëhwh=hd3!hh(hFhhih(>h-O>hxoh*+hwh*+H*hwh*+H*mHsH hwh*+hwh*+6mHsHh hwhQEh/h4 hg_hQEhhQEh~h@f2^clu(OVXY_t*,24"L`z $&,1DE`   ȵȵܱܵܭȭUhFhUh$+hBh[fhs[U hpuh0hah0H*h0h0OJQJhnsh~ hwxhKnDh]hPhd3!h;$hLPh(>h &>and died off at about 50 K. In addition, non-linearity observed in dc electric fields below 18K showed features observed previously in other commensurate density waves. Observed dynamics is discussed and compared with phason/soliton response to applied ac and dc electric fields in other quasi-1D and 2D organics with strong correlations. [1] T.Ivek et al., Phys.Rev.B83, 165128(1-13), 2011. [2] K.Tamura et al., J. Appl.Phys.107, 103716(1-5), 2010. [3] T.Ivek et al., to be submitted, 2012. [4] M.Pinteric et al., Eur.Phys.J.B11, 217-225, 1999. [5] P.Lunkenheimer et al., arXiv.org1111.2752v2, 2011.      + ` a g q S!T!U!V!W!i!t!!!!!!!!!""$"&"A"J"["Ǽ}}rg\hQh mHsHhQhdomHsHhQh{qmHsHhQh 3mH sH hQh{qmH sH hphvhQhwmH sH hQhpmH sH hQhvmH sH hQhR~mH sH hQhd3!mH sH hwxhj8B*phhj8h 3hns hwh0hZhO,hAeh#KO#V!W!!!!&"]"_"`"b"c"e"f"h"i"j"k"gd}g $a$gd4$a$gd 3$a$gdp$a$gdj8["]"^"`"a"c"d"f"g"j"k"hknjhknUhQh4mHsH >&P1F/R :p./ =!"#$% !666666666vvvvvvvvv666666>6666666666666666666666666666666666666666666666666hH666666666666666666666666666666666666666666666666666666666666666666@@@ NormalCJ_HaJmH sH tH d@d  Heading 1$$@&a$"5@CJ KH OJQJ\^JaJ DAD Default Paragraph FontViV  Table Normal :V 44 la (k(No List H>@H Title$ a$5CJOJQJaJNT@N Block Text$]^a$CJaJTC@T Body Text Indent$d`a$aJH"H  Balloon TextCJOJQJ^JaJ<Z@2< y Plain Text OJQJ_HhOh yBI_Email_Address$da$CJOJQJ_HmH sH tH B'QB C+@0Comment ReferenceCJaJ<b< C+@0 Comment TextCJaJ.q. 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PL^P`LhH.l#&7w        VZIts$^@k~ i' }g z4/od3!";$O%e%p%iF&x&*+d. 3?P3=(>-O>TCKnDQEGGAAJ eK#KOLPQ#Q:R>RTs[U[g6h.iNkmlxoQq{qs/swxwxpyZ$+dvmp@fF i &[fr|~NB(.jU Pf0(do)\nsAe]O,+<iVbj8c@'`9pxR~knTF_B yC/nWm   @ L `@` `@``$@`@@Unknown Gz Times New Roman5Symbol3& z ArialSz TimesTimes New Roman5& zaTahoma71 Courier;& z Helvetica?5 z Courier New;Wingdings"1hb'b'ئ$ $ x4d N2qHP ? 2?Preparation of an Extended Abstract for the ICONO 10 ConferenceRobert J Twiegstomic  Oh+'0 $8 HT t   @Preparation of an Extended Abstract for the ICONO10 ConferenceRobert J Twieg Normal.dotstomic3Microsoft Office Word@V@_"@6\=@ >$ ՜.+,0( hp|  KSU  @Preparation of an Extended Abstract for the ICONO10 Conference Title  !"#$%&'()*+,-.012345689:;<=>ARoot Entry FJ>CData 1Table!WordDocument@*SummaryInformation(/DocumentSummaryInformation87CompObjq  FMicrosoft Office Word Document MSWordDocWord.Document.89q