M1 colloquium Shimizu-group M1 Daiki Hayashi Possibility of metallic phase and three-dimensional conductance of graphite.

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M1 colloquium Shimizu-group M1 Daiki Hayashi Possibility of metallic phase and three-dimensional conductance of graphite

Contents Introduction metal transition under pressure about graphite - feature - under high pressure - transformation into diamond - electrical behavior Works in Shimizu-Lab electrical behavior of graphite under high pressure and room temperature Mechanism of c-axis conductance electrical behavior of graphite under high pressure Summary & future work

Metal transition under pressure pressure effect ; shortening of atomic distance pressure structural magnetic metal-insulator superconductive and so on phase transition change of electrical correlation potential

Graphite ● ; T. Yagi, et al., Phys. Rev. B. 46, 6031 (1992). large anisotropy a 0 =2.465 Å, c 0 = Å In-plane ・・ covalent bonds Inter-plane ・・ van der Waals force semi-metallic material

Transformation into diamond graphite cubic-diamond hexagonal-diamond (Lonsdaleite) ( 六方晶 ) ( 立方晶 ) need high temperature to quench scarce material in natural unstable structure ＳＰ２（ graphite ）ＳＰ３（ diamond ）

Electrical behavior ⊥ c F. P. Bundy and J. S. Kasper, J. Chem. Phys. 46, 3437 (1967) resistance room temperature decreasing pressure increasing pressure graphite hexagonal diamond × decrease until about 14GPa but, suddenly increase with transition occur conductor insulator HOPG ( 高配向熱分解黒鉛 ) (high oriented pyrolytic graphite) (10 kbar = 1 GPa)

Our previous works measurement of a-axis and c-axis resistivity in parallel ？ Both resistivity decrease and get close three-dimensional conductance transition into diamond S. Ona, master thesis, Osaka Univ. (2009).

Temperature dependence a-axis ; metallic c-axis ; semi conductive? K. Matsubara, K. Sugihara, and T. Tsuzuku, Phys. Rev. B 41, 969 ~1990 (1990)

What’s the mechanism of conductance resistivity peak at 40 K below 40 K … metallic above 40 K … semi-conductive another method expect carrier- phonon interaction not shifted with pressure Sample ; HOPG size ; φ300 μm * 50~75 μm C. Uher, R. L. Hockey, and E. Ben-Jacob Phys. Rev. B 35, 4483–4488 (1987)

conductor insulator Stacking faults act reflecting barriers Tunneling model used the current-voltage characteristics for a conductor-insulator-conductor junction Stacking fault

Discussion Fitted by metallictunneling,g,b,c = constant best parameters to fit the c-axis resistivity at ambient pressure

Discussion pressure modifies the tunneling probability and g shift higher affection became small b and c are relatively independent of pressure difficult to see metallic behavior…

Summary Graphite has large anisotropy, and c-axis is effected much more than a-axis by pressure Their resistivity at room temperature gradually become near under pressure a-axis resistivity has metallic behavior c-axis resistivity depends so much on structural perfection, and should show metallic behavior in case of single crystal graphite

Future work observe under more high pressure until just before the transformation three-dimensional measurement use single crystalline sample to see metallic behavior

Calculation of single crystal high structural perfection is necessary to see metallic behavior at least below 200 K (temperature coefficient of resistivity) single crystal graphite (above 40 K ) best synthetically produced graphite from band theory J. C. Slonczewski and P. R. Weiss, Phys. Rev. 109, 272 (1958)