Simon, F., Dora, B., Muranyi, F., Janossy, A., Garaj, S., Forro, L., ...
The temperature dependence of the electron spin relaxation time in MgB2 is anomalous as it does not follow the temperature dependence of the resistivity above 150 K, it has a maximum around 400 K,...
Temperature-Dependent Elasticity of Microtubules (2008)
Kis, A, Kasas, S, Kulik, A J, Catsicas, S, Forro, L
Central to the biological function of microtubules is their ability to modify their length which occurs by addition and removal of subunits at the ends of the polymer, both in vivo and in vitro. This...
The increase in protein contour length depends on mechanical unfolding conditions (2008)
Dabrowska, A., Lebed, K., Kulik, A. J., Forro, L., Lekka, M.
Many proteins in alive organisms have a domain structure providing them the possibility to reversible unfolding, which seems to play an essential role in those processes occurring in tissues which...
Kezsmarki, I., Gaal, R., Homes, C. C., Sipos, B., Berger, H., Bordacs, S., ...
We have extended the range of the high-pressure optical spectroscopy to the far-infrared region keeping the accuracy of ambient-pressure experiments. The developed method offers a powerful tool for...
Matthiessen's rule in MgB2: Resistivity and T-c as a function of point defect concentration (2008)
Sipos, B., Barisic, N., Gaal, R., Forro, L., Karpinski, J., Rullier-Albenque, F.
We present the results of a systematic study of the temperature-dependent resistivity and of T-c of a single crystal MgB2 sample as a function of point defect concentration. We have found linear,...
Enhanced thermal stability and spin-lattice relaxation rate of N@C60 inside carbon nanotubes (2008)
Toth, S., Quintavalle, D., Nafradi, B., Korecz, L., Forro, L., Simon, F.
We studied the temperature stability of the endohedral fullerene molecule, N@C60, inside single-wall carbon nanotubes using electron spin resonance spectroscopy. We found that the nitrogen escapes at...
Mechanical detection of carbon nanotube resonator vibrations (2007)
Garcia-Sanchez, D., Paulo, A. San, Esplandiu, M. J., Perez-Murano, F., Forro, L., Aguasca, A., ...
Bending-mode vibrations of carbon nanotube resonator devices were mechanically detected in air at atmospheric pressure by means of a novel scanning force microscopy method. The fundamental and higher...
Metallic bundles of single-wall carbon nanotubes probed by electron spin resonance (2007)
Simon, F., Quintavalle, D., Janossy, A., Nafradi, B., Forro, L., Kuzmany, H., ...
C59N magnetic fullerenes inside single-wall carbon nanotubes (SWCNTs) are used to probe the density of states (DOS) on the host tubes using electron spin resonance (ESR). The C59N radicals are...
Effects of carbon nanotubes on grain boundary sliding in zirconia polycrystals (2007)
Daraktchiev, M., Schaller, R., Couteau, E., Forro, L.
Mechanical properties of zirconia polycrystals decrease drastically at high temperature due to thermally activated grain boundary (GB) sliding, leading to plastic or even super-plastic deformation....
Uniformly Dispersed Deposition of Colloidal Nanoparticles and Nanowires by Boiling (2007)
Lee, K., Duchamp, M., Kulik, G., Magrez, A., Seo, J. W., Jeney, S., ...
Uniformly dispersed deposition of various nanoparticles (gold and silver of 20?50 nm) and nanowires (ZnO and VOx) on different surfaces (Si, GaAs, mica, and steel) was obtained by boiling colloid...
Growth of carbon nanotubes with alkaline earth carbonate as support (2007)
Magrez, A., Seo, J. W., Miko, C., Hernadi, K., Forro, L.
Multiwalled carbon nanotubes (MWCNTs) were grown by chemical vapor deposition by applying C2H2 fluxed over Fe1-xCox catalyst supported by alkaline earth carbonate. Detailed investigations of the...
Growth kinetics of one-dimensional KNbO3 nanostructures by hydrothermal processing routes (2007)
Setter, N., Forro, L., Magrez, A., Vasco, E.
The growth kinetics of one-dimensional single-crystalline KNbO3 nanostructures (nanowires and nanofingers, the latter understood as defective nanowires) prepared by hydrothermal processing routes has...
Cellular toxicity of carbon-based nanomaterials (2007)
Magrez, A., Kasas, S., Salicio, V., Pasquier, N., Seo, J. W., Celio, M., ...
The cellular toxicity of carbon-based nanomaterials was studied as a function of their aspect ratio and surface chemistry. These structures were multiwalled carbon nanotubes, carbon nanofibers, and...
Growth of single-crystalline KNbO3 nanostructures (2007)
Magrez, A., Vasco, E., Seo, J. W., Dieker, C., Setter, N., Forro, L.
This communication reports on the growth of highly uniform KNbO3 nanowires exhibiting a narrow diameter distribution around 60 nm and a length-to-width ratio up to 100. The nanowires were prepared by...
Catalytically grown carbon nanotubes: from synthesis to toxicity (2007)
Seo, J. W., Magrez, A., Milas, M., Lee, Kyumin, Lukovac, V., Forro, L.
Catalytic chemical vapour deposition (CCVD) is currently the most promising technique to produce carbon nanotubes (CNTs) on a specific site as well as on a large-scale. Here, we review our recent...
Kezsmarki, I., Gaal, R., Homes, C. C., Sipos, B., Berger, H., Bordacs, S., ...
We have extended the range of the high-pressure optical spectroscopy to the far-infrared region keeping the accuracy of ambient-pressure experiments. The newly-developed method offers a powerful tool...
Spin resonance in the ordered magnetic state of Ni-5(TeO3)(4)Cl-2 (2007)
Mihaly, L, Feher, T, Dora, B, Nafradi, B, Berger, H, Forro, L
The transition metal tellurium oxychloride, Ni-5(TeO3)(4)Cl-2, has been investigated by high-field electron-spin resonance for frequencies up to 3 THz, at temperatures well below the magnetic...
Electron spin resonance of single-walled carbon nanotubes and related structures (2007)
Nafradi, B, Nemes, N M, Feher, T, Forro, L, Kim, Y, Fischer, J E, ...
We report new results on the electron spin resonance of single walled carbon nanotubes, peapods and double walled carbon nanotubes. A small ESR line is present in well purified samples and its...
Magnetic fullerenes inside single-wall carbon nanotubes (2007)
Simon, F, Kuzmany, H, Nafradi, B, Feher, T, Forro, L, Fulop, F, ...
C59N magnetic fullerenes were formed inside single-wall carbon nanotubes by vacuum annealing functionalized C59N molecules encapsulated inside the tubes. A hindered, anisotropic rotation of C59N was...
Oscillation modes of microtubules (2007)
Kasas, S., Cibert, C., Kis, A., Riederer, B. M., Forro, L., ...
Mechanical properties of microtubules explored using the finite elements method (2007)
Kasas, S., Kis, A., Riederer, B. M., Forro, L., Dietler, G., Catsicas, S.
Kasas, S., Wang, X., Hirling, H., Marsault, R., Huni, B., Yersin, A., ...
Collective Charge Excitations below the Metal-to-Insulator Transition in BaVS3 (2007)
Ivek, T., Vuletic, T., Tomic, S., Akrap, A., Berger, H., Forro, L.
The charge response in the barium vanadium sulfide (BaVS3) single crystals is characterized by dc resistivity and low frequency dielectric spectroscopy. A broad relaxation mode in MHz range with huge...
Akrap, A., Tutis, E., Kazakov, S. M., Zhigadlo, N. D., Karpinski, J., Forro, L.
We performed high-pressure transport measurements on high-quality single crystals of KOs2O6, a beta-pyrochlore superconductor. While the resistivity at high temperatures might approach saturation,...
Nanoscale mechanical properties – measuring techniques and applications (2007)
Kulik, A.J, Kis, A., Gremaud, G., Hengsberger, S., Zysset, Ph., Forro, L.
Mechanical properties of carbon nanotubes (2007)
Salvetat, J. P., Bonard, J. M., Thomson, N. H., Kulik, A. J., Forro, L., Benoit, W., ...
Elastic and shear moduli of single-walled carbon nanotube ropes (2007)
Salvetat, J. P., Briggs, G. A. D., Bonard, J. M., Bacsa, R. R., Kulik, A. J., Stockli, T., ...
Elastic modulus of ordered and disordered multiwalled carbon nanotubes (2007)
Salvetat, J. P., Kulik, A. J., Bonard, J. M., Briggs, G. A. D., Stockli, T., Metenier, K., ...
Nanomechanics of microtubules (2007)
Kis, A., Kasas, S., Babic, B., Kulik, A. J., Benoit, W., Briggs, G. A. D., ...
Shear and Young's moduli of MoS2 nanotube ropes (2007)
Kis, A., Mihailovic, D., Remskar, M., Mrzel, A., Jesih, A., Piwonski, I., ...
Reinforcement of single-walled carbon nanotube bundles by intertube bridging (2007)
Kis, A., Csanyi, G., Salvetat, J. P., Lee, T. N., Couteau, E., Kulik, A. J., ...
During their production, single-walled carbon nanotubes form bundles. Owing to the weak van der Waals interaction that holds them together in the bundle, the tubes can easily slide on each other,...
Versatile force-feedback manipulator for nanotechnology applications (2007)
Jobin, M., Foschia, R., Grange, S., Baur, C., Gremaud, G., Lee, Kyumin, ...
Friction force microscopy as an alternative method to probe molecular interactions (2007)
Lekka, M., Kulik, A. J., Jeney, S., Raczkowska, J., Lekki, J., Budkowski, A., ...
Direct observation of nondiffusive motion of a Brownian particle (2007)
Lukic, B., Jeney, S., Tischer, C., Kulik, A. J., Forro, L., Florin, E. L.
The thermal position fluctuations of a single micron-sized sphere immersed in a fluid were recorded by optical trapping interferometry with nanometer spatial and microsecond temporal resolution. We...
Catalytically grown carbon nanotubes of small diameter have a high Young's modulus (2007)
Lukic, B., Seo, J. W., Bacsa, R. R., Delpeux, S., Beguin, F., Bister, G., ...
Guzman, C., Jeney, S., Kreplak, L., Kasas, S., Kulik, A. J., Aebi, U., ...
Effect of ultraviolet light irradiation on macroscopic single-walled carbon nanotube bundles (2007)
Miko, C., Milas, M., Seo, J. W., Gaal, R., Kulik, A., Forro, L.
On linear resistivity from ~1 to 103 K in Sr2RuO4-δ single crystals grown by flux technique (2007)
Berger, H, Forro, L, Pavuna, D
We report transport measurements on single crystals of Sr2RuO4-δ, grown by the flux technique. The temperature dependence of the Hall coefficient is similar to the one measured in cuprates, and the...
Crossovers in the out-of-plane resistivity of superconducting Tl2Ba2CaCu2O8 single crystals (2007)
Salvetat, JP, Berger, H, Halbritter, A, Mihaly, G, Pavuna, D, Forro, L
We report the in-plane (rho (ab)) and out-of-plane (rho (c)) resistivities in the 4-800 K range on single crystals of Tl2Ba2CaCu2O8 high-T-c cuprate with T-c = 111 K (rho (c)/rho (ab) approximate to...
Pavuna, D, Berger, H, Forro, L
We present the resistivity measurements on single crystals of Sr2RuO4-delta, grown by the flux technique. We discuss the striking, linear temperature dependence of resistivity that persists up to...
The electronic structure and the phases of BaVS3 (2007)
Fazekas, P., Penc, K., Radnoczi, K., Barisic, N., Berger, H., Forro, L., ...
BaVS3 is a moderately correlated d-electron system with a rich phase diagram. To construct the corresponding minimal electronic model, one has to decide which d-states are occupied, and to which...
On the electronic properties of the quasi-one-dimensional crystal Nb/sub 4/Te/sub 17/I/sub 4/ (2007)
Berger, H, Marsi, M, Margaritondo, G, Forro, L, Beeli, C, Crotti, C, ...
Quantifying Valence-Loss EELS Spectra of Graphitic Carbon Spheres (2007)
Stockli, T, Wang, ZL, Bonard, JM, Salvetat, JP, Forro, L, Stadelmann, PA, ...
Spectral consequences of broken phase coherence in 1T-TaS/sub 2/ (2007)
Zwick, F, Berger, H, Vobornik, I, Margaritondo, G, Forro, L, Beeli, C, ...
Random defects destroy long-range phase coherence, and inhibit the metal-insulator transition in the charge density wave (CDW) system IT-TaS/sub 2/. Photoelectron spectroscopy with high resolution...
Non-uniform doping across the Fermi surface of NbS$_2$ intercalates (2006)
Battaglia, C., Cercellier, H., Despont, L., Monney, C., Prester, M., Berger, H., ...
Magnetic ordering of the first row transition metal intercalates of NbS$_2$ due to coupling between the conduction electrons and the intercalated ions has been explained in terms of Fermi surface...
Carbon Nanotube Based Bearing for Rotational Motions (2006)
Bourlon, Bertrand, Glattli, Christian, Forro, L., Bachtold, Adrian
We report the fabrication of a nanoelectromechanical system consisting of a plate rotating around a multiwalled nanotube bearing. The motion is possible thanks to the low intershell friction. Indeed,...
Geometrical Dependence of High-Bias Current in Multiwalled Carbon Nanotubes (2006)
Bourlon, Bertrand, Glattli, Christian, Plaçais, Bernard, Berroir, Jean-Marc, Forro, L., Bachtold, Adrian
We have studied the high-bias transport properties of the different shells that constitute a multiwalled carbon nanotube. The current is shown to be reduced as the shell diameter is decreased or the...
Beyond the Linearity of Current-Voltage Characteristics in Multiwalled Carbon Nanotubes (2006)
Bourlon, B., Miko, C., Forro, L., Glattli, D. C., Bachtold, A.
We present local and non-local electron transport measurements on individual multi-wall nanotubes for bias voltage between 0 and about 4 V. Local current-voltage characteristics are quite linear. In...
Mitrovic, S., Perfetti, L., Sondergaard, C., Margaritondo, G., Grioni, M., Barisic, N., ...
High-resolution angle-resolved photoemission (ARPES) displays quasi-one dimensional (1D) electronic states in the insulating molybdenum red bronze K0.33MoO3, in good qualitative agreement with band...
7ni-O Chemical Interaction and the Transition-Temperature of Ni-Doped Bi2sr2ca1cu2o8 (2006)
Almeras, P., Keszei, B., Berger, H., Forro, L., Margaritondo, G., Bussy, F.
We find that even very low Ni doping levels of high-quality Bi2Sr2Ca1Cu2O8 single crystals strongly affect the transition temperature T(c). We also observed that T(c) is not related to the total Ni...
High-Resolution Tests of Low-Dimensionality Effects in Photoemission (2006)
Coluzza, C., Berger, H., Almeras, P., Gozzo, F., Margaritondo, G., Indlekofer, G., ...
High-energy-resolution photoemission spectra, taken on three quasi-one-dimensional crystals, TaTe4, NbTe4, and (NbSe4)3I confirm the general phenomenon of the suppression of the photoemission...
On the electronic properties of the quasi-one-dimensional crystal Nb4Te17I4 (2006)
Berger, H., Marsi, M., Margaritondo, G., Forro, L., Beeli, C., Crotti, C., ...
We studied the newly synthesized quasi-one-dimensional compound Nb4Te17I4. Resistivity measurements confirmed its pseudo-one-dimensional character and photoemission spectroscopy clarified the nature...
Incomplete charge-density-wave gap opening in orthorhombic Mo4O11 (2006)
Terrasi, A., Marsi, M., Berger, H., Gauthier, F., Forro, L., Margaritondo, G., ...
Using angle-resolved photoemission, we report the first observation of an incomplete charge-density-wave (CDW) gap opening for the quasi-two-dimensional material Mo4O11. Our data indicate that the...
Spectral consequences of broken phase coherence in 1T-TaS2 (2006)
Zwick, F., Berger, H., Vobornik, I., Margaritondo, G., Forro, L., Beeli, C., ...
Random defects destroy long-range phase coherence, and inhibit the metal-insulator transition in the charge density wave (CDW) system 1T-TaS2. Photoelectron spectroscopy with high resolution reveals...
Doping-induced change of optical properties in underdoped cuprate superconductors (2006)
Liu, H. L., Quijada, M. A., Zibold, A. M., Yoon, Y. D., Tanner, D. B., Cao, G., ...
We report on the ab-plane optical reflectance measurements of single crystals of Y-doped Bi2Sr2CaCu2O8+delta and Pr-doped YBa2Cu3O7-delta over a wide frequency range from 80 to 40 000 cm(-1) (10...