1

M. Gasparini, G. A. Ummarino

Adiabatic perturbations and minimal size of the De Sitter vacuum

Physics Letters B, 266, 275-279 (1991)

2

V. Basso, M. Lo Bue, A. Magni, G. A. Ummarino, G. Bertotti

Experimental study and theoretical interpretation of hysteresis loops and Henkel plots
in soft magnetics materials

Journal of Magnetism and Magnetic Materials, 133, 111-114 (1994)

3

R. S. Gonnelli, D. Andreone, G. A. Ummarino

Inelastic tunneling and electron-phonon coupling in Bi₂Sr₂CaCu₂O_8+x

Physica C, 235-240, 1865-1866 (1994)

4

R. S. Gonnelli, S. I. Vedeneev, O. V. Dolgov, G. A. Ummarino

Influence of lifetime broadening in the determination of the Eliashberg function
from break-junction tunneling data in Bi₂Sr₂CaCu₂O_8+x single crystals

Physica C, 235-240, 1861-1862 (1994)

5

R. S. Gonnelli, O. V. Dolgov, G. A. Ummarino, S. I. Vedeneev

Comparison of the Eliashberg functions determined from point-contact
and break-junction tunneling experiments in Bi₂Sr₂CaCu₂O_8+x

Il Nuovo Cimento, 16 D, 1903-1907 (1994)

6

R. S. Gonnelli, D. Puttero, G. A. Ummarino, V. A. Stepanov

The role of the surface depression of the pair potential
on the Josephson and quasi-particle tunneling in high-T_c superconductors

Il Nuovo Cimento, 16 D, 1979-1985 (1994)

7

R. S. Gonnelli, D. Puttero, G. A. Ummarino, V. A. Stepanov, Francesca Licci

Influence of a surface-depressed order parameter on the Josephson critical current
in Bi₂Sr₂CaCu₂O_8+x nonhysteretic break junction

Physical Review B, 51, 12782-12785 (1995)

8

R. S. Gonnelli, D. Puttero, G. A. Ummarino, V. A. Stepanov

Temperature dependence of the Josephson critical current in Bi₂Sr₂CaCu₂O_8+x break junctions

IEEE Transaction on Applied Superconductivity, 5, 2539-2542 (1995)

9

R. S. Gonnelli, D. Puttero, G. A. Ummarino

The critical current of SIS and SIS’ high-T_c Josephson junctions
with a surface-depressed order parameter

Proceedings of the European Conference on Applied Superconductivity, EUCAS ‘95, Edinburgh,
Inst. Phys. Conf. Ser., No 148, 1351-1354 (1995)

10

R. S. Gonnelli, D. Puttero, G. A. Ummarino

The intrinsic determinants of the critical current in SIS and SIS’ high-T_c Josephson junctions

Applied Physical Letters, 68 (17), 2433-2435 (1996)

11

R. S. Gonnelli, G. A. Ummarino

Surface order-parameter depression and pair symmetry in high-T_c Josephson junctions

Modern Physical Letters B, no. 16, 753-763 (1996)

12

R. S. Gonnelli, G. A. Ummarino, V. A. Stepanov

Determination of the tunneling electron-phonon spectral function
in high-T_c superconductors with energy dependance of the normal density of states

Physica C, 275, 162-171 (1997)

13

R. S. Gonnelli, D. Puttero, G. A. Ummarino, C. Bravi

Surface depression of the order parameter and pair symmetry
in the Josephson critical current of high-T_c SIS and SIS’ junctions

IEEE Transaction on Applied Superconductivity, 7, 3331-3334 (1997)

14

R. S. Gonnelli, G. A. Ummarino, C. Bravi, V. A. Stepanov

Influence of surface-depressed order parameter and pair symmetry
in the critical current of high-T_c Josephson junctions

Il Nuovo Cimento 19 D, 1207-1214 (1997)

15

G. A. Ummarino, R. S. Gonnelli, V. A. Stepanov

Eliashberg equations with energy dependence of the normal density of states
and quasiparticle tunneling in high-T_c superconductors

Il Nuovo Cimento, 19 D, 1215-1221 (1997)

16

G. A. Ummarino, R. S. Gonnelli, V. A. Stepanov

Energy dependence of the normal density of states and of electron-phonon spectral function
in the quasiparticle tunneling in high-T_c superconductors

Physica C, 282-287, 1501-1502 (1997)

17

R. S. Gonnelli, G. A. Ummarino, V. A. Stepanov

Tunneling spectroscopy in Bi₂Sr₂CaCu₂O_8+x single cristal break-junctions:
reproducible determination of the Eliashberg function
and role of the breakdown of Migdal’s Theorem

Physica C, 282-287, 1473-1474 (1997)

18

R. S. Gonnelli, G. A. Ummarino, C. Bravi, V. A. Stepanov

The role of the pair symmetry and intrinsic surface depression of the order parameter
on the critical current of high-T_c SIS and SIS’ Josephson junctions

Physica C, 282-287, 2403-2404 (1997)

19

G. A. Ummarino, R. S. Gonnelli, C. Bravi, V. A. Stepanov

Intrinsic surface depression of the order parameter under mixed (s+id)-wave pair symmetry
and its effect on the critical current of high-T_c SIS Josephson junctions

Journal of Physics and Chemistry of Solids, 10, 657-662 (1997)

20

G. A. Ummarino, R. S. Gonnelli

Breakdown of Migdal’s Theorem and intensity of electron-phonon coupling
in high-T_c superconductors

Physical Review B - Rapid Comm., 56, R14279-R14283 (1997)

21

R. S. Gonnelli, G. A. Ummarino, V. A. Stepanov

Reproducible tunneling determination of the electron-phonon spectral function
in optimally-doped Bi-2212 single crystal break-junctions

Journal of Physics and Chemistry of Solids, Vol. 59, 10-12 ,2058-2061 (1998)

22

G. A. Ummarino, R. S. Gonnelli, C. Bravi, Masumi Inoue

Pair symmetry and degree of gap depression at S-I interfaces in HTS Josephson junctions

International Journal of Modern Physics B, vol. 13, n. 9 & 10, 1301-1306 (1999)

23

G. A. Ummarino, R. S. Gonnelli

The effects of the breakdown of Migdal’s Theorem in various superconductors

International Journal of Modern Physics B, vol. 13, n. 9 & 10, 1215-1220 (1999)

24

G. A. Ummarino, R. S. Gonnelli

Some consequences of the breakdown of Migdal’s Theorem in high-T_c superconductors

Physica C, 317-318, 524-527 (1999)

25

R. S. Gonnelli, G. A. Ummarino, V. A. Stepanov

Eliashberg equations, pair symmetry and tunneling density of states
in high-T_c layered superconductors

Physica C, 317-318, 378-382 (1999)

26

G. A. Ummarino, R. S. Gonnelli

Real-axis direct solution of the d-wave Eliashberg equations
and the tunneling density of states in optimally doped Bi₂Sr₂CaCu₂O_8+x

Physica C, 328, 189-194 (1999)