Perturbation Theory on the Transition Temperature and Electronic Properties of Organic Superconductor
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概要
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XN7e sttrdy tlae strpercondtrcting transition teraajcerattzre and the electronic jcr'operties of' thernetallic phase of ?-type (BBDT-TTF)2X xvltich sl?oxvs trnconvetttional projoerties in experittaents,on the basis of the third order jcerturbatioza theory f'or a siznple efl'ective Htrblc;trd model of' anearly triangular l?tttice. Appropriate trarnsition teutaperattrres and d.w .2 syuaatt'xetry of thegulp f'trnction ?rre o1ct?rined in good agreer+nerat xvith experi?aaentarl restrlts. We also c?rlcttlate thetransition teraaperattrre Icy tlae fltrctttation-exclaange approxirta;rtion (FLEX) in order to COIIIJ)211'(Bthe txvo approaches; FLEX gives higher trauasitior? teutnperatures rather' th?rn the perttrrbation;tpproach. Howexzer, it is also fotrnd that tlae vertex corr'ections, whicl'n are ignored in FLEX, l12lN7C;+ crtrcial efl'ect on T. f'or strotagly f'rtrstrated s3'steutms. The density of' states and the 1101111211 self5nergy calcvxlated ita this perttrrbationa sclnetaae SIIONV the raai,trre of the cornventional Fertaai liquidnear tlae lVIott-instulator. TI4L1S, otrr perttrrbation approach is applicatble to the convention;tlmetallic phase of this couaupovxtad, ',vhile it cannot explain the (psetrdo-)spin gap phenornenonwhich signals tlae non-Ferntai liqtrid,
- 社団法人日本物理学会の論文
- 1999-04-15
著者
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Koikegami Shigeru
Department Of Physics Kyoto University
-
Yamada Kosaku
Department Of Physics Kyoto University
-
Yamada Kosaku
Department Of Mechanical Engineering Faculty Of Engineering Kagoshima University
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Jujo Takanobu
Department Of Physics Kyoto University
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