Pressure effect on a conductive coordination compound [Cu(TANC)](F)0.5 with new radical frameworks

Recently, a conductive coordination compound [Cu(TANC)](F) 0.5 with new radical frameworks was synthesized, where TANC stands for 5,6,11,12-tetraazanaphacene. We have measured the electrical resistivity of [Cu(TANC)](F) 0.5 under high pressures up to 8.0 GPa. At ambient pressure, the temperature dependence of the resistivity shows semiconducting behavior described by a variable range hopping conduction, ρ( T ) ∼exp ( T 0 / T ) η . The value of T 0 increases with increasing pressure up to 6.5 GPa, beyond which it decreases abruptly. The pressure dependence of T 0 is discussed in terms of the increase of the pureness of one-dimensionality and the strength of the random potential due to disordered F - ions.

[1]  N. Mōri,et al.  Low‐temperature and high-pressure apparatus developed at ISSP, University of Tokyo , 2004 .

[2]  S. Tarutani,et al.  High pressure properties of extremely one-dimensional electronic conductors Me4X(CPDT-TCNQ)2 (X = N, P and As) , 2002 .

[3]  R. Kato.  Conductive Copper Salts of 2,5-Disubstituted N,N′-Dicyanobenzoquinonediimines (DCNQIs): Structural and Physical Properties , 2000 .

[4]  K. Kanoda,et al.  13 C NMR study of the metal-insulator transition in ( D M e − D C N Q I ) 2 Cu systems with partial deuteration , 1998 .

[5]  K. Yonemitsu.  Renormalization-group approach to the metal-insulator transitions in ( DCNQI ) 2 M (DCNQI is N , N ′ -dicyanoquinonediimine and M = Ag , Cu) , 1997, cond-mat/9706183.

[6]  K. Murata,et al.  Pt resistor thermometry and pressure calibration in a clamped pressure cell with the medium, Daphne 7373 , 1997 .

[7]  T. Ogawa,et al.  Effect of Strong Correlation on Metal-Insulator Transition of DCNQI-Cu Salts:Rigorous Treatment of the Local Constraint , 1997 .

[8]  Miyazaki,et al.  First-principles theoretical study of metallic states of DCNQI-(Cu,Ag,Li) systems. , 1996, Physical review. B, Condensed matter.

[9]  H. Sawa,et al.  Enhanced magnetic susceptibility of (DI-DCNQI)2Cu , 1995 .

[10]  N. Mōri,et al.  Anomalous pressure-temperature phase diagram of the molecular conductor, (DI-DCNQI)2Cu (DI-DCNQI=2,5-DIIODO-N,N′-dicyanoquinonediimine) , 1995 .

[11]  H. Sawa,et al.  Charge-Transfer-Controlled Phase Transition in a Molecular Conductor, (DMe-DCNQI)2Cu—Doping Effect— , 1994 .

[12]  T. Takahashi,et al.  Magnetism of DCNQI-Cu salts , 1993 .

[13]  Miyamoto,et al.  Mixed valency of Cu, electron-mass enhancement, and three-dimensional arrangement of magnetic sites in the organic conductors (R1,R2-N,N'-dicyanoquinonediimine)2Cu (where R1,R2=CH3,CH3O,Cl,Br). , 1993, Physical review. B, Condensed matter.

[14]  Reizo Kato,et al.  Crystal and electronic structures of conductive anion-radical salts, (2,5-R1R2-DCNQI)2Cu (DCNQI = N,N'-dicyanoquinonediimine; R1, R2 = CH3, CH3O, Cl, Br) , 1989 .

[15]  G. Klebe,et al.  Synthesis and structure of new anion radical salts from DCNQIs , 1988 .

[16]  Kobayashi,et al.  Electrical conductivity, thermoelectric power, and ESR of a new family of molecular conductors, dicyanoquinonediimine-metal , 1988, Physical review. B, Condensed matter.

[17]  Takehiko Mori,et al.  Pressure-Induced One-Dimensional Instability in (DMDCNQI)2Cu , 1987 .

[18]  H. Inokuchi,et al.  The organic π-electron metal system with interaction through mixed-valence metal cation: Electronic and structural properties of radical salts of dicyano-quinodiimine, (DMe-DCNQI)2Cu and (MeCl-DCNQI)2Cu , 1987 .

[19]  Gerhard Klebe,et al.  A Radical Anion Salt of 2,5‐Dimethyl‐N,N′‐dicyanoquinonediimine with Extremely High Electrical Conductivity , 1986 .

[20]  H. C. Montgomery.  Method for Measuring Electrical Resistivity of Anisotropic Materials , 1971 .

[21]  N F Mott,et al.  The Basis of the Electron Theory of Metals, with Special Reference to the Transition Metals , 1949 .