V. Ferrando

Role of interband scattering in neutron irradiated MgB $_{2}$ thin films by Scanning Tunneling Spectroscopy measurements

R. Di Capua, H. U. Aebersold, C. Ferdeghini +6

A series of MgB $_{2}$ thin films systematically disordered by neutron irradiation have been studied by Scanning Tunneling Spectroscopy. The c-axis orientation of the films allowed a…

Point-Contact Spectroscopy in MgB_2: from Fundamental Physics to Thin-Film Characterization

R. S. Gonnelli, D. Daghero, A. Calzolari +9

In this paper we highlight the advantages of using point-contact spectroscopy (PCS) in multigap superconductors like MgB_2, both as a fundamental research tool and as a non-destruc…

cond-mat.supr-con2004

Epitaxial MgB2 thin films on ZrB2 buffer layers: structural characterization by synchrotron radiation

V. Ferrando, C. Tarantini, E. Bellingeri +7

Structural and superconducting properties of magnesium diboride thin films grown by pulsed laser deposition on zirconium diboride buffer layers were studied. We demonstrate that th…

cond-mat.mtrl-sci2003

Pulsed Laser Deposition of epitaxial titanium diboride thin films

V. Ferrando, D. Marre', P. Manfrinetti +3

Epitaxial titanium diboride thin films have been deposited on sapphire substrates by Pulsed Laser Ablation technique. Structural properties of the films have been studied during th…

Effect of the four-sheet Fermi surface on magnetoresistivity of MgB2

I. Pallecchi, M. Monni, C. Ferdeghini +4

Recent experimental data of anisotropic magnetoresistivity measured in MgB2 films have shown an intriguing behaviour: the angular dependence of magnetoresistivity changes dramatica…

Growth of c-oriented MgB2 thin films by Pulsed Laser Deposition: structural characterization and electronic anisotropy

C. Ferdeghini, V. Ferrando, G. Grassano +9

MgB2 thin films were deposited using Pulsed Laser Deposition (PLD) and ex-situ annealing in Mg atmosphere. The films presented critical temperatures up to 36K and turned out to be…

cond-mat.supr-con2004

Upper Critical Fields up to 60T in Dirty Magnesium Diboride Thin Films

C. Ferdeghini, V. Ferrando, C. Tarantini +11

Upper critical fields of several magnesium diboride thin films were measured up to 28 T at the Grenoble High Magnetic Field Laboratory (GHMFL) in Grenoble and up to 60 T at the Lab…

Effects of neutron irradiation on polycrystalline Mg11B2

C. Tarantini, H. U. Aebersold, V. Braccini +13

We studied the influence of the disorder introduced in polycrystalline MgB2 samples by neutron irradiation. To circumvent self shielding effects due to the strong interaction betwe…

cond-mat.supr-con2005

Magnetoresistivity in MgB2 as a probe of disorder in p- and s-bands

I. Pallecchi, V. Ferrando, E. Galleani D'Agliano +10

In this paper we present normal state magnetoresistivity data of magnesium diboride epitaxial thin films with different levels of disorder, measured at 42K in magnetic fields up to…

In-situ Magnesium Diboride Superconducting Thin Films grown by Pulsed Laser Deposition

G. Grassano, W. Ramadan, V. Ferrando +9

Superconducting thin films of MgB2 were deposited by Pulsed Laser Deposition on magnesium oxide and sapphire substrates. Samples grown at 450C in an argon buffer pressure of about…

Upper critical fields of MgB2 thin films

V. Ferrando, C. Bernini, P. Manfrinetti +4

Critical fields of four MgB2 thin films with a normal state resistivity ranging from 5 to 50 mWcm and Tc from 29.5 to 38.8 K were measured up to 28 T. Hc2(T) curves present a linea…

Josephson effect and tunneling spectroscopy in Nb/Al2O3/Al/MgB2 thin films junctions

G. Carapella, N. Martucciello, G. Costabile +3

We report the demonstration of dc and ac Josephson effects as well as tunneling spectroscopy measurements on Nb/Al2O3/Al/MgB2 thin films heterostructures. Data on dc Josephson effe…

cond-mat.supr-con2002

Angular dependence of magnetoresistivity in c-oriented MgB2 thin film

C. Ferdeghini, V. Braccini, M. R. Cimberle +5

The anisotropy of MgB2 is still under debate: its value, strongly dependent on the sample and on the measuring method, ranges between 1.2 and 13. In this work we present our result…

cond-mat.supr-con2007

Probing the electron-phonon coupling in MgB2 through magnetoresistance measurements in neutron irradiated thin films

M. Monni, I. Pallecchi, C. Ferdeghini +9

We report magnetoresistance (MR) measurements on MgB2 and the corresponding full account from ab-initio calculations; we suggest that this combination can be a useful tool to probe…

Effect of two bands on critical fields in MgB2 thin films with various resistivity values

V. Ferrando, P. Manfrinetti, D. Marre' +4

Upper critical fields of four MgB2 thin films were measured up to 28 Tesla at Grenoble High Magnetic Field Laboratory. The films were grown by Pulsed Laser Deposition and showed cr…

cond-mat.supr-con2008

Two-band parallel conductivity at terahertz frequencies in the superconducting state of MgB $_{2}$ .

M. Ortolani, P. Dore, D. Di Castro +7

The optical response of the two-band superconductor MgB $_{2}$ has been studied in the 0.7-4 THz range on films with very low impurity level. The effect of the high-energy $I ¨ $ -gap is…

cond-mat.supr-con2002

Growth methods of c-axis oriented MgB2 thin films by pulsed laser deposition

V. Ferrando, S. Amoruso, E. Bellingeri +6

High quality MgB2 thin films have been obtained by pulsed laser deposition both on MgO and on Al2O3 substrates using different methods. In the standard two-step procedure, an amorp…

Transport properties of c-oriented MgB2 thin films grown by Pulsed Laser Deposition

C. Ferdeghini, V. Ferrando, G. Grassano +5

The electronic anisotropy in MgB2, which arises from its layered crystal structure is not completely clear until now. High quality c-oriented films offer the opportunity of studyin…

cond-mat.supr-con2004

High-field superconductivity in alloyed MgB2 thin films

V. Braccini, A. Gurevich, J. E. Giencke +24

We investigated the effect of alloying on the upper critical field $H_{c 2}$ in 12 $M g B_{2}$ films, in which disorder was introduced by growth, carbon doping or He-ion irradiation, fi…

High critical fields in MgB2 thin films with various resistivity values

V. Ferrando, C. Tarantini, P. Manfrinetti +4

In this paper, we analyze the upper critical field of four MgB2 thin films, with different resistivity (between 5 to 50 mWcm) and critical temperature (between 29.5 to 38.8 K), mea…

Anisotropy in c-oriented MgB2 thin films grown by Pulsed Laser Deposition

C. Ferdeghini, V. Ferrando, G. Grassano +10

The electronic anisotropy in MgB2, is still a not completely clear topic; high quality c-oriented films are suitable systems to investigate this property. In this work we present o…