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of 114
pro vyhledávání: '"Kempa, H"'
We present Hall effect measurements on highly oriented pyrolytic graphite that indicate the occurrence of the integer quantum-Hall-effect. The evidence is given by the observation of regular plateau-like structures in the field dependence of the tran
Externí odkaz:
http://arxiv.org/abs/cond-mat/0603155
Publikováno v:
Superconductor Science & Technology 18, 325 (2005)
We report on measurements of higher harmonics of the ac voltage response in strips of YBa2Cu3O7 thin films as a function of temperature, frequency and ac current amplitude. The third (fifth) harmonic of the local voltage is found to exhibit a negativ
Externí odkaz:
http://arxiv.org/abs/cond-mat/0506402
We report on the magnetic field (0T$ \le B \le 9$T) dependence of the longitudinal thermal conductivity $\kappa(T,B)$ of highly oriented pyrolytic graphite in the temperature range 5 K $\le T\le$ 20 K for fields parallel to the $c-$axis. We show that
Externí odkaz:
http://arxiv.org/abs/cond-mat/0309129
Autor:
Kempa, H., Esquinazi, P.
Inspired by the striking similarities between the metal-insulator transitions in graphite and Si-MOSFET's and the recent attention to charge doping in carbon-based materials, we have made attempts to fabricate a field-effect transistor based on graph
Externí odkaz:
http://arxiv.org/abs/cond-mat/0304105
Autor:
Kopelevich, Y., Esquinazi, P., Torres, J. H. S., da Silva, R. R., Kempa, H., Mrowka, F., Ocana, R.
Publikováno v:
Studies of High Temperature Superconductors, Vol. 45, pp. 59-106 (2003), ed. A. Narlikar
This article reviews recent results of magnetotransport and magnetization measurements performed on highly oriented pyrolitic graphite (HOPG) and single crystalline Kish graphite samples. Both metal-insulator and insulator-metal transitions driven by
Externí odkaz:
http://arxiv.org/abs/cond-mat/0209442
Publikováno v:
Phys. Rev. Lett. 90, 156402 (2003)
Magnetotransport measurements performed on several well-characterized highly oriented pyrolitic graphite and single crystalline Kish graphite samples reveal a reentrant metallic behavior in the basal-plane resistance at high magnetic fields, when onl
Externí odkaz:
http://arxiv.org/abs/cond-mat/0209406
Publikováno v:
Solid State Commun. 125, 1-5 (2003)
Measurements of the magnetoresistivity of graphite with a high degree of control of the angle between the sample and magnetic field indicate that the metal-insulator transition (MIT), shown to be induced by a magnetic field applied perpendicular to t
Externí odkaz:
http://arxiv.org/abs/cond-mat/0206565
Publikováno v:
Phys. Rev. B 65, 241101(R) (2002)
We show that the resistivity perpendicular $\rho_c$ and parallel $\rho_a$ to the basal planes of different graphite samples show similar magnetic-field-driven metal-insulator-transitions at a field $B_c \sim 0.1 T$ applied parallel to the c-axis. Our
Externí odkaz:
http://arxiv.org/abs/cond-mat/0204166
Autor:
Kempa, H., Kopelevich, Y., Mrowka, F., Setzer, A., Torres, J. H. S., Höhne, R., Esquinazi, P.
A magnetic-field-driven transition from metallic- to semiconducting-type behavior in the basal-plane resistance takes place in highly oriented pyrolytic graphite at a field $H_c \sim 1~$kOe applied along the hexagonal c-axis. The analysis of the data
Externí odkaz:
http://arxiv.org/abs/cond-mat/0005439
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