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Publications

2009

1. Study of the ground multiplet of Kramers rare earth ions in solid matrices by multifrequency electron paramagnetic resonance spectroscopy: Nd3+ in PbWO4 single-crystals
F.F.Popescu, V.Bercu, J.N.Barascu, M.Martinelli, C.A.Massa, L.A.Pardi,M.Stefan, S.V.Nistor, M.Nikl, P.Bohacek
Journal of Chemical Physics, Volume 131, Issue 3, pp. 034505-034505-7, 2009

2008

1. XRD and FTIR characterization of nanocrystalline YVO4:RE3+ (RE=ER, EU, TB) derived by co-precipitation process
E.Borca, M. Bercu, S. Georgescu,Cc. Stoicescu, S. Hodorogea, E. Cotoi
Z. Kristallogr. suppl. 27, 2008

2. Magnetic characterization of some nanometric iron oxides
V. V. Grecu, S. Constantinescu, M.N. Grecu, R.Olar, M.Badea, R.Turcu
Hyperfine Interactions,183, 205-214, 2008

3. The applicability of the caves theorem to solid-state masers without inversion
M. Oane, F. Popescu, Shyh-Lin Tsao, F. Scarlat, C.Oproiu, I.N. Mihailescu, A.Scarisoreanu
Nuclear Physics a ,799 , 94, 2008

4. Gamow-teller beta decay of KR-74 in a self-consistent approach
A. Petrovici, k. W. Schmid, O. Radu, Amand Faessler
Nuclear Physics a ,799 , 94, 2008

5. Anomaly of the rotational nonergodicity parameter of glass formers probed by high field electron paramagnetic resonance
V.Bercu, M.Martinelli, C.A.Massa, L.A.Pardi,E.A. Rossler, D.Leporini
Journal of Chemical Physics - COMMUNICATION , Vol. 129 (8), 081102, 2008

6. Physics of Polymers at the Italian High-Field EPR Facility: Heterogeneities and Fast Dynamics
V.Bercu, M.Martinelli, C.A.Massa, L.A.Pardi, D.Leporini
Applied Magnetic Resonance, Vol. 33( 4), pp 365-370, 2008

2007

1. Sensitivity of High-Field Electron Paramagnetic Resonance to the reorientation of molecular guests in glassy polymers
V.Bercu, M.Martinelli, C.A.Massa, L.A.Pardi, D.Leporini
Philosophical Magazine, Vol. 87( 3-5), pp 795-798, 2007

2. High-Field Electron Paramagnetic Resonance in polymers and glasses: criteria for the optimal choice of the spin probe
V.Bercu, M.Martinelli, C.A.Massa, L.A.Pardi, D.Leporini
Journal of Optoelectronics and Advanced Materials, Vol. 9(6) pp. 1785 1788, 2007

2006

1. A spin resonance investigation of magnetism and dynamics in the charge-transfer salts beta-(BEDT-TTF)(4)[(H3O)M(C2O4)(3)]S
A.Narduzzo, A.Coldea, A.Ardavan, J.Singleton, L.Pardi, V.Bercu, A.Akutsu-Sato, H,Akutsu, S.Turner, P.Day
Journal of Low Temperature Physics, Vol. 142 (3-4), pp 581-584, 2006

2. Signatures of the fast dynamics in glassy polystyrene by multi-frequency, high-field Electron Paramagnetic Resonance of molecular guests
V.Bercu, M.Martinelli, C.A.Massa, L.A.Pardi,D.Leporini
Journal of Non-Crystalline Solids, Vol. 352, pp 5029-5034, 2006

2005

1. Multifrequency electron paramagnetic resonance of Ce3+ in the Gd(HBPz3)2 tropolonate complex: high-field effects
F.F.Popescu, M.Martinelli, C.A.Massa, L.A.Pardi,V.Bercu
Journal of Physics-Condensed Matter, Vol. 17 (36), pp. 5563-5575, Sept. 14, 2005

2. Delocalization of spin projection in weak exchange linear chains, evidenced by multifrequency HF-EPR spectroscopy
F.F.Popescu, M.Martinelli, C.A.Massa, L.A.Pardi, V.Bercu
Magnetic Resonance in Chemistry, Vol.43, pp. S215-S220, 2005

3. Signatures of the fast dynamics in glassy polystyrene: First evidence by high-field Electron Paramagnetic Resonance of molecular guests
V.Bercu, M.Martinelli, C.A.Massa, L.A.Pardi, D.Leporini
Journal of Chemical Physics, Vol. 123 (17), 174906, 2005

4. The onset of the fast dynamics in glassy polystyrene observed by the detrapping of guest molecules: A high-field Electron Paramagnetic Resonance study
V.Bercu, M.Martinelli, C.A.Massa, L.A.Pardi, D.Leporini
Europhysics Letters, Vol. 72 (4), pp 590-596, 2005

2004

1. Electron spin resonance studies of the organic superconductor -(BEDT-TTF)4[ (H 3O)Fe(C2O 4) 3] C 6H 5CN
A.Narduzzo, A.Ardavan, J.Singleton, L.Pardi, V.Bercu, A.Akutsu-Sato, H.Akutsu, S.S.Turner, P.Day
J. Phys. IV France, Vol.114, 347, 2004

2. A study of the deep structure of the energy landscape of glassy polystyrene: the exponential distribution of the energy barriers revealed by high-field electron spin resonance spectroscopy
V.Bercu, M.Martinelli, C.A.Massa, L.A.Pardi,D.Leporini
Journal of Physics-Condensed Matter, Vol. 16 (43), L479-L488, Nov. 3, 2004
Top paper 2004 of JPCM

2003

1. Relaxation processes in a multilevel spin system investigated by linewidth analysis of multifrequency high-frequency EPR spectra
M.Martinelli, C.A.Massa, L.A.Pardi, V.Bercu, F.F.Popescu
Physical Review B, Vol. 67, 014425, 2003



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University of Bucharest



Faculty of Physics