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Bálint Náfrádi

Cette personne n’est plus à l’EPFL

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Publications associées (80)

Magnetic fluctuations above the Neel temperature in kappa-(BEDT-TTF)(2)Cu[N(CN)(2)]Cl, a quasi-2D Heisenberg antiferromagnet with Dzyaloshinskii-Moriya interaction

László Forró, Bálint Náfrádi, Agnes Antal

We report on magnetic fluctuations studied by electron spin resonance (ESR) spectroscopy in the layered organic crystal ?-(BEDT-TTF)2Cu[N(CN)2]Cl. A line broadening above the antiferromagnetic ordering temperature, TN?=?23?K is attributed to two-dimensiona ...

2012

Pressure and temperature dependence of interlayer spin diffusion and electrical conductivity in the layered organic conductors kappa-(BEDT-TTF)(2)Cu[N(CN)(2)]X (X = Cl, Br)

László Forró, Bálint Náfrádi, Agnes Antal

A high frequency (111.2-420 GHz) electron spin resonance study of the interlayer spin diffusion is presented in the conducting phases of the layered organic compounds, kappa-( BEDT-TTF)(2)Cu[N(CN)(2)]X (kappa-ET2-X), X = Cl or Br. The interlayer spin cross ...

2011

Dual [proton]/[hole] mixed valence in a molecular metal: balancing chemical activity in the solid state by tapping into a molecular hole reservoir

László Forró, Bálint Náfrádi

We report on the synthesis, the layered triclinic P (1) over bar crystal structure, band structure and Fermi surface analysis and preliminary transport and ESR data of beta-(EDT-TTF-I-2)(2)((1+x)center dot+)HO2C-CH=CH-CO2--O2C-CH=CH-CO2-, a m ...

Royal Society of Chemistry2011

A Neutral Zwitterionic Molecular Solid

László Forró, Bálint Náfrádi, Balazs Sipos

We report on the acid ethylenedithiotetrathiafulvaleneamidoglycine (EDT-TTF-CO-NH-CH2-CO2H; 1; EDT-TTF=ethylenedithiotetrathiafulvalene) and the 1:1 adduct [(EDT-TTF)(center dot+) -CO-NH-CH2-(CO2H)(-)][(EDT-TTF)-CO-NH-CH2-(CO2H)]center dot CH3OH (2), a new ...

2010

Spin dynamics in the S=1/2 antiferromagnetic chain compounds delta-(EDT-TTF-CONMe2)(2)X (X=AsF6, Br): A multifrequency electron spin resonance study

László Forró, Bálint Náfrádi

We present a multifrequency electron spin resonance study in the range of 4-420 GHz of the quasi-one-dimensional, nondimerized, quarter-filled Mott insulators, delta-(EDT-TTF-CONMe2)(2)X (X=AsF6, Br). In the high-temperature orthorhombic phase above T simi ...

2010

Multifrequency ESR in ET2 MnCu[N(CN)(2)](4): A radical cation salt with quasi-two-dimensional magnetic layers in a three-dimensional polymeric structure

László Forró, Bálint Náfrádi, Krisztina Nagy

The radical cation salt, ET2MnCuN(CN)(2), [ET=bis(ethylenedithio)tetrathiafulvalene] with an unusual three-dimensional anionic polymeric network is studied by x-ray diffraction, static susceptibility measurements, and electron spin resonance (ESR) at ...

2009

Towards electron spin resonance of mechanically exfoliated graphene

László Forró, Andrzej Sienkiewicz, Arnaud Magrez, Bálint Náfrádi, Marijana Mionic Ebersold, Luka Ciric

We have attempted to prepare graphene samples by mechanical exfoliation of HOPG (highly oriented pyrolytic graphite) using scotch tape. Random testing of the flakes by AFM has shown in majority single layer graphene. Nevertheless, the presence of ultrathin ...

2009

La@C82 as a spin-active filling of SWCNTs: ESR study of magnetic and photophysical properties

László Forró, Andrzej Sienkiewicz, Arnaud Magrez, Bálint Náfrádi, Katarzyna Pierzchala, Luka Ciric, Duncan Thomas Lindsay Alexander

Electron microscopy (TEM) and electron spin resonance ESR) were applied to characterize lanthanum metallofullerene(La@C82)-filled peapods. The peapods were prepared by encapsulation of La@C82 in SWCNTs, which were obtained by laser ablation technique in th ...

2008

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

Multi-frequency high-pressure electron spin resonance study of low dimensonal organic conductors

Bálint Náfrádi

Electronic and magnetic properties of quasi-one dimensional ormore widely low-dimensional systems aswell as their related correlated electron phenomena have been at the very frontier of condensed matter physics for quite some time. The reduced dimensionali ...

EPFL2008

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

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

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

Metallic bundles of single-wall carbon nanotubes probed by electron spin resonance

László Forró, Bálint Náfrádi

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 separated by C60 fullerenes to prevent dimerization and C59N-C6 ...

wiley-vch2007

Magnetic fullerenes inside single-wall carbon nanotubes

László Forró, Bálint Náfrádi

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 deduced from the temperature dependence of the electron s ...

2006

Spin resonance in the ordered magnetic state of Ni-5(TeO3)(4)Cl-2

Helmuth Berger, László Forró, Bálint Náfrádi

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 ordering at 23 K. At zero external field several resonance modes ...

2006

Electron spin resonance of single-walled carbon nanotubes and related structures

László Forró, Bálint Náfrádi

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 temperature dependence reveals a striking 'super-Curie' paramag ...

2006

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