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List of selected publications of the LaTEST group

ReviewsPoint-contact spectroscopy (general)

Daghero D.; Gonnelli R. S (2010) 
Probing multiband superconductivity by point-contact spectroscopy. In: SUPERCONDUCTOR SCIENCE & TECHNOLOGY, vol. 23, 043001-1-043001-37. - ISSN 0953-2048

D. Daghero, M. Tortello, P. Pecchio, V.A. Stepanov, R.S. Gonnelli (2013) 
Point-contact Andreev-reflection spectroscopy in anisotropic superconductors: the importance of directionality. In: LOW TEMPERATURE PHYSICS, vol. 39 n. 3, pp. 261-275. - ISSN 1063-777X 

Superconductivity

Gonnelli R.S., Daghero D. (2010) 
La superconduttività all'inizio del terzo millennio: Nuove scopertee nuovi misteri. In: GIORNALE DI FISICA DELLA SOCIETÀ ITALIANA DI FISICA, vol. 51, N.2, pp. 131-171. - ISSN 0017-0283

Point-contact spectroscopy in Iron-based superconductors

R.S. Gonnelli, D. Daghero, M. Tortello (2013) 
Point contact spectroscopy in Fe-based superconductors: Recent advancements and future challenges. In: CURRENT OPINION IN SOLID STATE & MATERIALS SCIENCE, vol. 17, pp. 72-80. - ISSN 1359-0286

Daghero D., Tortello M., Ummarino G.A., Gonnelli R.S. (2011) 
Directional point-contact Andreev-reflection spectroscopy of Fe-based superconductors: Fermi surface topology, gap symmetry, and electron-boson interaction. In: REPORTS ON PROGRESS IN PHYSICS, vol. 74, 124509-1-124509-27. - ISSN 0034-4885

Point-contact spectroscopy in magnesium diboride

Gonnelli R.S.; Daghero D; Ummarino G.A; Tortello M; Delaude D; Stepanov V.A; Karpinski J (2007) 
Point-contact Andreev-reflection spectroscopy in MgB2: The role of substitutions. In: PHYSICA. C, SUPERCONDUCTIVITY, vol. 456, pp. 134-143. - ISSN 0921-4534

Iron-based superconductorsD Daghero, P Pecchio, G A Ummarino, F Nabeshima, Y Imai, A Maeda, I Tsukada, S Komiya, R S Gonnelli (2014) 
Point-contact Andreev-reflection spectroscopy in Fe(Te,Se) films: multiband superconductivity and electron-boson coupling. In: SUPERCONDUCTOR SCIENCE & TECHNOLOGY, vol. 27 n. 12, 124014-1-124014-8. - ISSN 0953-2048

Daghero D., Pecchio P., Laviano F., Gonnelli R.S., Kurth F., Grinenko V., Iida K. (2014) 
Advanced surface characterization of Ba(Fe_(0.92)Co_(0.08))_2As_2 epitaxial thin films. In: APPLIED SURFACE SCIENCE, vol. 312, pp. 23-29. - ISSN 0169-4332

P. Pecchio,D. Daghero,G.A. Ummarino,R.S. Gonnelli,F. Kurth,B. Holzapfel,K. Iida (2013) 
Doping and critical-temperature dependence of the energy gaps in Ba(Fe_{1−x}Co_{x})_{2}As_{2} thin films. In: PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS, vol. 88 n. 17, 174506-1-174506-9. - ISSN 1098-0121

Daghero D, Tortello M, Ummarino G A, Stepanov V A, Bernardini F, Tropeano M, Putti M, Gonnelli R S (2012) 
Effects of isoelectronic Ru substitution at the Fe site on the energy gaps of optimally F-doped SmFeAsO. In: SUPERCONDUCTOR SCIENCE & TECHNOLOGY, vol. 25 n. 8, 084012-1-084012-11. - ISSN 0953-2048

Gonnelli R.S., Tortello M., Daghero D., Kremer R.K., Bukowski Z., Zhigadlo N.D., Karpinski J. (2012) 
Point-contact spectroscopy in Co-doped CaFe2As2: nodal superconductivity and topological Fermi surface transition. In: SUPERCONDUCTOR SCIENCE & TECHNOLOGY, vol. 25, 065007-1-065007-7. - ISSN 0953-2048

Tortello M., Daghero D., Ummarino G.A., Stepanov V.A., Jiang J., Weiss J.D., Hellstrom E.E., Gonnelli R.S. (2010) 
Multigap Superconductivity and Strong Electron-Boson Coupling in Fe-Based Superconductors: A Point-Contact Andreev-Reflection Study of Ba(Fe(1-x)Co(x))(2)As(2) Single Crystals. In: PHYSICAL REVIEW LETTERS, vol. 105, 237002-1-237002-4. - ISSN 0031-9007 

Gonnelli R.S., Daghero D., Tortello M., Ummarino G.A., Stepanov V.A., Kim J.S., Kremer R.K. (2009) 
Coexistence of two order parameters and a pseudogaplike feature in the iron-based superconductor LaFeAsO1−xFx. In: PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS, vol. 79, 184526-1-184526-11. - ISSN 1098-0121

Daghero D; Tortello M.; Gonnelli R.S; Stepanov V.A; Zhigadlo N.D; Karpinski J (2009) 
Evidence for two-gap nodeless superconductivity in SmFeAsO1−xFx from point-contact Andreev-reflection spectroscopy. In: PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS, vol. 80, 060502-1-060502-4. - ISSN 1098-0121
Other superconductorsDaghero D., Tortello M., Ummarino G.A., Griveau J.-C., Colineau E., Eloirdi R., Shick A.B., Kolorenc J., Lichtenstein A.I., Caciuffo R. (2012) 
Strong-coupling d-wave superconductivity in PuCoGa5 probed by point-contact spectroscopy. In: NATURE COMMUNICATIONS, vol. 3, 786-1-786-8. - ISSN 2041-1723 

Gonnelli R.S.; Daghero D; Delaude D; Tortello M; Ummarino G.A; Stepanov V.A; Kim J.S; Kremer R.K; Sanna A; Profeta G; Massidda S (2008) 
Evidence for Gap Anisotropy in CaC6 from Directional Point-Contact Spectroscopy. In: PHYSICAL REVIEW LETTERS, vol. 100, 207004-1-207004-4. - ISSN 0031-9007

D. Daghero; R.S. Gonnelli; Ummarino G.A.; A. Calzolari; Valeria Dellarocca; V.A. Stepanov; V.B. Filippov; Y.B. Paderno (2004) 
Andreev-reflection spectroscopy of the gap in ZrB12 single crystals. In: SUPERCONDUCTOR SCIENCE & TECHNOLOGY, vol. 17 n. 5, S250-S254. - ISSN 0953-2048 
MgB2 and related compoundsDaghero D; Delaude Debora; Calzolari A; Tortello M; Ummarino G.A; Gonnelli R.S.; Stepanov V.A; Zhigadlo N.D; Katrych S; Karpinski J (2008) 
Point-contact Andreev-reflection spectroscopy in segregation-free Mg1-xAlxB2 single crystals up to x = 0.32. In: JOURNAL OF PHYSICS. CONDENSED MATTER, vol. 20, 085225-1-085225-12. - ISSN 0953-8984

Gonnelli R.S.; Daghero D; Ummarino G.A; Calzolari A; Tortello M; Stepanov V.A; Zhigadlo N.D; Rogacki K; Karpinski J.; Bernardini F.; Massidda S. (2006) 
Effect of magnetic impurities in a two-band superconductor: A point-contact study of Mn-substituted MgB2 single crystals. In: PHYSICAL REVIEW LETTERS, vol. 97 n. 3, 037001-1-037001-4. - ISSN 0031-9007

Daghero D; Calzolari A; Ummarino G. A; Tortello M; Gonnelli R.S.; Stepanov V.A; Tarantini C; Manfrinetti P; Lehmann E (2006) 
Point-contact spectroscopy in neutron-irradiated Mg11B2. In: PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS, vol. 74, 174519-1-174519-11. - ISSN 1098-0121

Gonnelli R.S.; Daghero D.; Calzolari A.; Ummarino G.A.; Dellarocca V.; Stepanov V.A.; Kazakov S.M.; Zhigadlo N.; Karpinski J. (2005) 
Evidence for Single-gap Superconductivity in Mg(B1-xCx)2 Single Crystals with x=0.132 from Point-Contact Spectroscopy. In: PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS, vol. 71 n. 6, 060503(R)-1-060503(R)-4. - ISSN 1098-0121

R.S. Gonnelli; D. Daghero; A. Calzolari; Ummarino G.A.; V. Dellarocca; V.A. Stepanov; J. Jun; S.M. Kazakov; J. Karpinski (2004) 
Magnetic-field dependence of the gaps in a two-band superconductor: a point-contact study of MgB2 single crystals. In: PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS, vol. 69, 100504-1-100504-4. - ISSN 1098-0121

D. Daghero; R.S. Gonnelli; Ummarino G.A.; V.A. Stepanov; J. Jun; S.M. Kazakov; J. Karpinski. (2003) 
Point-contact spectroscopy in MgB2 single crystals in magnetic field. In: PHYSICA. C, SUPERCONDUCTIVITY, vol. 385 n. 1-2, pp. 255-263. - ISSN 0921-4534 

Gonnelli R.S.; Daghero D.; Ummarino G.A.; Stepanov V.A.; Jun J.; Kazakov S.M.; Karpinski J. (2002) 
Direct Evidence for Two-Band Superconductivity in MgB2 Single Crystals from Directional Point-Contact Spectroscopy in Magnetic Fields. In: PHYSICAL REVIEW LETTERS, vol. 89 n. 24, 247004-1-247004-4. - ISSN 0031-9007 

Gonnelli R. S; A. Calzolari; Daghero D.; G.A. Ummarino; V.A. Stepanov; G. Giunchi; S. Ceresara; G. Ripamonti (2001) 
Josephson effect in MgB2 break junctions. In: PHYSICAL REVIEW LETTERS, vol. 87 n. 9, 097001-1-097001-4. - ISSN 0031-9007 
Cuprate superconductorsGonnelli R. S; Calzolari A; Daghero D.; Natale L; Ummarino G.A; Stepanov V.A; Ferretti M (2001) 
Evidence for pseudogap and phase-coherence gap separation by Andreev reflection experiments in Au/La2-xSrxCuO4 point-contact junctions. In: THE EUROPEAN PHYSICAL JOURNAL. B, CONDENSED MATTER PHYSICS, vol. 22, pp. 411-414. - ISSN 1434-6028 

A. Morello; A.G.M. Jansen; Gonnelli R.S.; S. Vedeneev (2000) 
Irreversibility line of overdoped Bi_(2+x)Sr_(2-(x+y))Cu_(1+y)O_(6ħd) at ultralow temperatures and high magnetic fields. In: PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS, vol. 61, pp. 9113-9117. - ISSN 1098-0121

R.S. Gonnelli; Ummarino G.A.; V.A. Stepanov (1998) 
Reproducible tunneling determination of the electron-phonon spectral function in optimally-doped Bi-2212 single crystal break-junctions. In: JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS, vol. 59/ 10-12, pp. 2058-2061. - ISSN 0022-3697

Gonnelli R.; D. Puttero; Ummarino G.A. (1996) 
The intrinsic determinants of the critical current in SIS' and SIS high-Tc Josephson junctions. In: APPLIED PHYSICS LETTERS, vol. 68, pp. 2433-2435. - ISSN 0003-6951 

Gonnelli R.; D. Puttero; Ummarino G.A.; V.A. Stepanov; F. Licci. (1995) 
Influence of a surface-depressed order parameter on the Josephson critical current in Bi2Sr2CaCu2O8+x nonhysteretic break junctions. In: PHYSICAL REVIEW. B, CONDENSED MATTER, vol. 51, pp. 12782-12785. - ISSN 0163-1829

Gonnelli R.S.; Asdente F; Andreone D (1994) 
Reproducible inelastic tunneling in Nb/Bi2Sr2CaCu2O8+x point-contact junctions. In: PHYSICAL REVIEW. B, CONDENSED MATTER, vol. 49, pp. 1480-1483. - ISSN 0163-1829 
Eliashberg theoryG A Ummarino,Sara Galasso,A Sanna (2013) 
A phenomenological multiband Eliashberg model for LiFeAs. In: JOURNAL OF PHYSICS. CONDENSED MATTER, vol. 25, 205701-. - ISSN 0953-8984

Sanna A.; Pittalis S.; Dewhurst J.K.; Monni M.; Sharma S.; Ummarino G.A.; Massida S.; Gross E.K.U. (2012) 
Phononic self-energy effects and superconductivity in CaC6. In: PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS, vol. 85, 184514-1-184514-8. - ISSN 1098-0121

Ummarino G.A. (2011) 
Multiband sħ Eliashberg theory and temperature-dependent spin-resonance energy in iron pnictide superconductors. In: PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS, vol. 83, 092508-1-092508-4. - ISSN 1098-0121

Ummarino G.A., Caciuffo R., Chudo H., Kambe S. (2010) 
Energy scale of the electron-boson spectral function and superconductivity in NpPd5Al2. In: PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS, vol. 82, 104510-1-104510-7. - ISSN 1098-0121 

Ummarino G.A., Tortello M., Daghero D., Gonnelli R.S. (2009) 
Three-band sħ Eliashberg theory and the superconducting gaps of iron pnictides. In: PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS, vol. 80, 172503-1-172503-4. - ISSN 1098-0121

F. Jutier; Ummarino G.A.; J.C. Griveau; F. Wastin; E. Colineau; J. Rebizant; N. Magnani And R. Caciuffo (2008) 
Possible mechanism of superconductivity in PuCoGa5 probed by self-irradiation damage. In: PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS, vol. 77 n. 2, 024521-1-024521-5. - ISSN 1098-0121

E. Cappelluti; Ummarino G.A. (2007) 
Strong-coupling properties of unbalanced Eliashberg superconductors. In: PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS, vol. 76, 104522-1-104522-9. - ISSN 1098-0121 

Ummarino G.A; Daghero D.; Gonnelli R. S; Moudden A.H (2005) 
Carbon substitutions in MgB2 within the two-band Eliashberg theory. In: PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS, vol. 71 n. 13, 134511-1-134511-6. - ISSN 1098-0121

Ummarino G.A.; Gonnelli R.S.; Massidda S.; Bianconi A. (2004) 
Two-band Eliashberg equations and the experimental T-c of the diboride Mg1-xAlxB2. In: PHYSICA. C, SUPERCONDUCTIVITY, vol. 407 n. 2-3, pp. 121-127. - ISSN 0921-4534 

Dolgov O.V; Gonnelli R.S; Ummarino G.A.; Golubov A.A; Shulga S.V; Kortus J (2003) 
Extraction of the electron-phonon interaction from tunneling data in the multigap superconductor MgB2. In: PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS, vol. 68, 132503-1-132507-4. - ISSN 1098-0121

Ummarino G.A., Gonnelli R.S. (2002) 
The possible explanation of electric-field-doped C60 phenomenology in the framework of Eliashberg theory. In: PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS, vol. 66, 104514-1-104514-6. - ISSN 1098-0121 

Ummarino G.A.; Gonnelli R.S. (1999) 
Real-axis direct solution of the d-wave Eliashberg equations and the tunneling density of states in optimally doped Bi2Sr2CaCu2O8+x. In: PHYSICA. C, SUPERCONDUCTIVITY, vol. 328, pp. 189-194. - ISSN 0921-4534

Ummarino G. A; Gonnelli R.S. (1997) 
Breakdown of Migdal's theorem and intensity of electron-phonon coupling in high-Tc superconductors. In: PHYSICAL REVIEW. B, CONDENSED MATTER, vol. 56 n. 22, pp. 14279-14282. - ISSN 0163-1829 

Field effectTortello M., Sola A., Sharda K., Paolucci F., Nair J.R., Gerbaldi C., Daghero D., Gonnelli R.S. (2013) 
Huge field-effect surface charge injection and conductance modulation in metallic thin films by electrochemical gating. In: APPLIED SURFACE SCIENCE, vol. 269, pp. 17-22. - ISSN 0169-4332

Daghero D., Paolucci F., Sola A., Tortello M., Ummarino G.A., Agosto M., Gonnelli R.S., Nair J.R., Gerbaldi C. (2012) 
Large Conductance Modulation of Gold Thin Films by Huge Charge Injection via Electrochemical Gating. In: PHYSICAL REVIEW LETTERS, vol. 108 n. 6, 066807-1-066807-5. - ISSN 0031-9007




LaTEST - Department of Applied Science and Technology, Politecnico di Torino
corso Duca degli Abruzzi 24, 10129 Torino (TO) - Italy
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