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László Forró

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Related publications (298)

Stability and electronic properties of magnetic peapods

László Forró, Bálint Náfrádi, Sándor Tóth

We report on the temperature stability of N@C-60 peapods using electron spin resonance. The atomic nitrogen escapes at higher temperatures in the peapod than in the crystalline form. We also report on the synthesis of novel magnetic fullerene peapod, a ful ...

2008

Electron spin resonance in alkali doped SWCNTs

László Forró, Bálint Náfrádi

Electron spin resonance (ESR) measurements on SWCNTs doped with alkali atoms (potassium) using a solid state reaction is reported. We find the emergence of the ESR signal of itinerant electrons upon doping with a signal intensity that is comparable to that ...

2008

Enhanced thermal stability and spin-lattice relaxation rate of N@C-60 inside carbon nanotubes

László Forró, Bálint Náfrádi, Sándor Tóth

We studied the temperature stability of the endohedral fullerene molecule N@C-60 inside single-wall carbon nanotubes using electron-spin-resonance spectroscopy. We found that the nitrogen escapes at higher temperatures in the encapsulated material as compa ...

2008

Generalized Elliott-Yafet Theory of Electron Spin Relaxation in Metals: Origin of the Anomalous Electron Spin Lifetime in MgB2

László Forró, Slaven Garaj

The temperature dependence of the electron-spin relaxation time in MgB2 is anomalous as it does not follow the resistivity above 150 K; it has a maximum around 400 K and decreases for higher temperatures. This violates the well established Elliot-Yafet the ...

2008

Subnanometer motion of cargoes driven by thermal gradients along carbon nanotubes

László Forró

An important issue in nanoelectromechanical systems is developing small electrically driven motors. We report on an artificial nanofabricated motor in which one short carbon nanotube moves relative to another coaxial nanotube. A cargo is attached to an abl ...

American Association for the Advancement of Science2008

Influence of point defects on the metal-insulator transition in BaVS3

Helmuth Berger, László Forró, Aurore Rudolf, Ana Akrap

2008

Temperature-Dependent Elasticity of Microtubules

László Forró, Andrzej Kulik, Andras Kis, Sandor Kasas

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 dynamic behavior is strongly influenced by temperature. ...

American Chemical Society2008

From Mott state to superconductivity in 1T-TaS2

Helmuth Berger, László Forró, Eduard Tutis, Ana Akrap, Balazs Sipos

The search for the coexistence between superconductivity and other collective electronic states in many instances promoted the discovery of novel states of matter. The manner in which the different types of electronic order combine remains an ongoing puzzl ...

2008

Magnetic anisotropy of paramagnetic and ferromagnetically ordered state of single crystal BaVSe3

Helmuth Berger, László Forró, Ana Akrap

Anisotropic magnetism of single crystal BaVSe3 was Studied for the first time by the combination of the susceptibility and torque methods. As reported previously for polycrystalline sample, BaVSe3 undergoes ferromagnetic ordering below 43 K. Well above fer ...

2008

Influence of chemical substitutions on the charge instability of BaVS3

Helmuth Berger, László Forró, Ana Akrap

We study the influence of Sr substitutions on the structural counterpart of the MI transition of BaVS3. When Sr content increases, the commensurate CDW modulation of pure BaVS3 is changed into an incommensurate short range modulation that we attribute to a ...

2008

Resistive switching in beta-SrV6O15

László Forró, Richard Gaal, Ana Akrap

EDP Sciences, Springer2008

Influence of the catalyst drying process and catalyst support particle size on the carbon nanotubes produced by CCVD

László Forró, Arnaud Magrez, Marijana Mionic Ebersold

Catalytic Chemical Vapour Deposition (CCVD) is considered as the most suitable technique for the large scale and low-cost production of multiwalled carbon nanotubes. We have studied the effect of the preparation process, and of the support particle size on ...

2008

Microwave frequency modulation in continuous-wave far-infrared ESR utilizing a quasi-optical reflection bridge

László Forró, Richard Gaal, Bálint Náfrádi

We report the development of the frequency-modulation (FM) method for measuring electron spin resonance (ESR) absorption in the 210- to 420 GHz frequency range. We demonstrate that using a high-frequency ESR spectrometer without resonating microwave compon ...

Academic Press Inc - Elsevier Science2008

Collective charge excitations below the metal-to-insulator transition in BaVS3

Helmuth Berger, László Forró, Ana Akrap

The charge response in barium vanadium sulfide (BaVS3) single crystals is characterized by dc resistivity and low-frequency dielectric spectroscopy. A broad relaxation mode in the megahertz range with a huge dielectric constant of approximate to 10(6) emer ...

2008

Anisotropic memory effects in confined colloidal diffusion

László Forró, Branimir Lukic, Sylvia Jeney

The motion of an optically trapped sphere constrained by the vicinity of a wall is investigated at times where hydrodynamic memory is significant. First, we quantify, in bulk, the influence of confinement arising from the trapping potential on the sphere's ...

2008

Transport and magnetic properties of BaVSe3

Helmuth Berger, László Forró, Neven Barisic, Ana Akrap, Vladan Stevanovic

We report a comprehensive study of transport, magnetotransport, and magnetic properties of single crystals of BaVSe3. The paramagnetic metal-ferromagnetic metal transition at 43 K was followed as a function of pressure by measuring the electrical resistivi ...

2008

High frequency electron spin resonance study of peapods

László Forró, Bálint Náfrádi, Luka Ciric

We present high frequency Electron Spin Resonance (ESR) results on a peapod sample. In a previous low frequency ESR study on peapods and double-walled nanotubes the observation of a non-Lorentzian line shape was reported. This effect was tentatively attrib ...

2008

Supramolecular approach to the synthesis of [60]fullerene-metal dithiocarbamate complexes, {(M-II(R(2)dtc)(2))(x)center dot L}center dot C-60 (M = Zn, Cd, Hg, Fe, and Mn; x=1 and 2). The study of magnetic properties and photoconductivity

László Forró, Bálint Náfrádi

Coordination assemblies formed by metal(II) dithiocarbamates M-II(R(2)dtc)2 (M = Zn, Cd, Hg, Mn, and Fe; R = Me, Et, iPr, nPr, and nBu) and nitrogen-containing ligands (L = DABCO, DMP, and HMTA) are shown to be sterically well consistent with the spherical ...

2008

The increase in protein contour length depends on mechanical unfolding conditions

László Forró, Andrzej Kulik

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 are controlled by mechanical cellular tension. In this work ...

2008

Continuous-wave far-infrared ESR spectrometer for high-pressure measurements

László Forró, Andrzej Sienkiewicz, Richard Gaal, Bálint Náfrádi

We present a newly-developed microwave probe for performing sensitive high-field/multi-frequency electron spin resonance (ESR) measurements under high hydrostatic pressures. The system consists of a BeCu-made pressure-resistant vessel, which accommodates t ...

Academic Press Inc - Elsevier Science2008

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