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Maria IavaroneAssociate Professor of PhysicsPh.D., University of Napoli Federico II, ItalySERC, Room 440
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Research Interests
My research interests mainly comprise two subjects: strongly correlated electron systems and mesoscopic systems. The lab revolves around the use of low temperature scanning tunneling microscopy and spectroscopy to investigate the properties of condensed matter systems at the nanoscale. With these experimental tools we can look at new phenomena in established condensed matter systems as well as novel materials.
Complex materials
The primary goal of my research is to focus on some unsolved issues of complex materials, with major emphasis on the study of the elementary excitations. In strongly correlated electron systems the coupling and competition of several degrees of freedom lead to emergence of exciting novel ground states. Examples are high Tc superconductivity, the new discovered family of pnictides, colossal magnetoresistance manganites, organic superconductors, dilute magnetic semiconductors and many more. The absence of a complete theoretical description for complex materials is now asking for careful, systematic characterization of elementary excitations as they determine the fundamental macroscopic properties. Low temperature scanning tunneling microscopy and spectroscopy is a unique technique that provides detailed information about the spatial electronic properties.
Mesoscopic Superconductors
In mesoscopic materials the free energy of the surface is comparable to or dominates the energy of the bulk, producing a rich variety of new equilibrium states. Abrikosov vortices in bulk superconductors form a hexagonal lattice, while in mesoscopic superconductors they can rearrange to form molecule states or giant vortices. Our goal is to understand the behavior of vortex matter under spatial confinement and in the presence of local magnetic order.
Complex materials
The primary goal of my research is to focus on some unsolved issues of complex materials, with major emphasis on the study of the elementary excitations. In strongly correlated electron systems the coupling and competition of several degrees of freedom lead to emergence of exciting novel ground states. Examples are high Tc superconductivity, the new discovered family of pnictides, colossal magnetoresistance manganites, organic superconductors, dilute magnetic semiconductors and many more. The absence of a complete theoretical description for complex materials is now asking for careful, systematic characterization of elementary excitations as they determine the fundamental macroscopic properties. Low temperature scanning tunneling microscopy and spectroscopy is a unique technique that provides detailed information about the spatial electronic properties.
Mesoscopic Superconductors
In mesoscopic materials the free energy of the surface is comparable to or dominates the energy of the bulk, producing a rich variety of new equilibrium states. Abrikosov vortices in bulk superconductors form a hexagonal lattice, while in mesoscopic superconductors they can rearrange to form molecule states or giant vortices. Our goal is to understand the behavior of vortex matter under spatial confinement and in the presence of local magnetic order.
Key Publications
1. "Visualizing domain wall and reverse domain superconductivity", M. Iavarone, S.A. Moore, J. Fedor, S. T. Ciocys, G. Karapetrov, J. Pearson, V. Novosad and S.D. Bader Nature Communications 5, 4766 (2014) doi:10.1038/ncomms5766
2. "Vortex-antivortex coexistence in Nb-based superconductor/ferromagnet heterostructures", F. Bobba, C. Di Giorgio, A. Scarfato, M. Longobardi, M. Iavarone, S. A. Moore, G. Karapetrov, V. Novosad, V. Yefremenko, and A. M. Cucolo, Phys. Rev. B 89, 214502 (2014)
3. "Influence of topological edge states on the properties of Al/Bi2Se3/Al hybrid Josephson devices", L. Galletti, S. Charpentier, M. Iavarone, P. Lucignano, D. Massarotti, R. Arpaia, Y. Suzuki, K. Kadowaki, T. Bauch, A. Tagliacozzo, F. Tafuri, and F. Lombardi Phys. Rev. B 89, 134512 (2014)
4. "Magnetization properties and vortex phase diagram of CuxTiSe2 single crystals", P. Husanikova, J. Fedor, J. Derer, J. Soltys, V. Cambel, M. Iavarone, S. J. May, and G. Karapetrov Phys. Rev. B 88, 174501 (2013)
5. "Evidence of vortex jamming in Abrikosov vortex flux flow regime", G. Karapetrov, V. Yefremenko, G. Mihajlović, J. E. Pearson, M. Iavarone, V. Novosad, and S. D. Bader Phys. Rev. B 86, 054524 (2012)
6. "Evolution of the charge density wave state in CuxTiSe2", M. Iavarone, R. Di Capua, X. Zhang, M. Golalikhani, S. A. Moore, and G.Karapetrov Phys. Rev. B 85, 155103 (2012)
7. "Imaging the spontaneous formation of vortex-antivortex pairs in superconductor/ferromagnet hybrid structures", M. Iavarone, A. Scarfato, F. Bobba, M. Longobardi, G. Karapetrov, V. Novosad, V. Yefremenko, F. Giubileo, A.M. Cucolo, Phys. Rev. B 84, 024506 (2011)
8. “Transverse Instabilities of Multiple Vortex Chains in Magnetically Coupled NbSe2/Permalloy S/F Bilayers”, G. Karapetrov, M. V. Milosevic, M. Iavarone, J. Fedor, A. Belikn, V. Novosad, and F. M. Peeters , Phys. Rev. B 80, 180506 (2009)
9. “Effect of Magnetic Impurities on the Vortex Lattice Properties in NbSe2 Single Crystals” M. Iavarone, R. Di Capua, G. Karapetrov, D. Rosenmann, H. Claus, C. D. Malliakas, M. G. Kanatzidis, T. Nishizaki, and N. Kobayashi, Phys. Rev. B 78,
174518 (2008)
10. “Coexistence and Coupling of Two Distinct Charge Density Waves in Sm2Te5”, C. Malliakas, M. Iavarone, J. Fedor, M. Kanatzidis, J. Am. Chem. Soc. 130 (11), 3310 (2008)
11. “Direct Observation of Geometrical Phase Transitions in Mesoscopic Superconductors by Scanning Tunneling Microscopy,” G. Karapetrov, J. Fedor, M. Iavarone, D. Rosenman and W. Kwok, Phys. Rev. Lett. 95, 167002 (2005)
12. “Effect of disorder in MgB2 thin films,” M. Iavarone, R. Di Capua, A.E. Koshelev, and W.K. Kwok, F. Chiarella, R. Vaglio, W.N. Kang, E.M. Choi, H.J. Kim, S.I. Lee, A.V. Pogrebnyakov, J.M. Redwing, and X.X. Xi, Phys. Rev. B 71, 214502 (2005)
13. “Two-band superconductivity in MgB2” M. Iavarone, G. Karapetrov, A.E. Koshelev, W.K. Kwok, G.W. Crabtree, D.G. Hinks, W.N. Kang, E.M. Choi, H.J. Kim, S.I. Lee, Phys. Rev. Lett 89, 1870021-4 (2002)
2. "Vortex-antivortex coexistence in Nb-based superconductor/ferromagnet heterostructures", F. Bobba, C. Di Giorgio, A. Scarfato, M. Longobardi, M. Iavarone, S. A. Moore, G. Karapetrov, V. Novosad, V. Yefremenko, and A. M. Cucolo, Phys. Rev. B 89, 214502 (2014)
3. "Influence of topological edge states on the properties of Al/Bi2Se3/Al hybrid Josephson devices", L. Galletti, S. Charpentier, M. Iavarone, P. Lucignano, D. Massarotti, R. Arpaia, Y. Suzuki, K. Kadowaki, T. Bauch, A. Tagliacozzo, F. Tafuri, and F. Lombardi Phys. Rev. B 89, 134512 (2014)
4. "Magnetization properties and vortex phase diagram of CuxTiSe2 single crystals", P. Husanikova, J. Fedor, J. Derer, J. Soltys, V. Cambel, M. Iavarone, S. J. May, and G. Karapetrov Phys. Rev. B 88, 174501 (2013)
5. "Evidence of vortex jamming in Abrikosov vortex flux flow regime", G. Karapetrov, V. Yefremenko, G. Mihajlović, J. E. Pearson, M. Iavarone, V. Novosad, and S. D. Bader Phys. Rev. B 86, 054524 (2012)
6. "Evolution of the charge density wave state in CuxTiSe2", M. Iavarone, R. Di Capua, X. Zhang, M. Golalikhani, S. A. Moore, and G.Karapetrov Phys. Rev. B 85, 155103 (2012)
7. "Imaging the spontaneous formation of vortex-antivortex pairs in superconductor/ferromagnet hybrid structures", M. Iavarone, A. Scarfato, F. Bobba, M. Longobardi, G. Karapetrov, V. Novosad, V. Yefremenko, F. Giubileo, A.M. Cucolo, Phys. Rev. B 84, 024506 (2011)
8. “Transverse Instabilities of Multiple Vortex Chains in Magnetically Coupled NbSe2/Permalloy S/F Bilayers”, G. Karapetrov, M. V. Milosevic, M. Iavarone, J. Fedor, A. Belikn, V. Novosad, and F. M. Peeters , Phys. Rev. B 80, 180506 (2009)
9. “Effect of Magnetic Impurities on the Vortex Lattice Properties in NbSe2 Single Crystals” M. Iavarone, R. Di Capua, G. Karapetrov, D. Rosenmann, H. Claus, C. D. Malliakas, M. G. Kanatzidis, T. Nishizaki, and N. Kobayashi, Phys. Rev. B 78,
174518 (2008)
10. “Coexistence and Coupling of Two Distinct Charge Density Waves in Sm2Te5”, C. Malliakas, M. Iavarone, J. Fedor, M. Kanatzidis, J. Am. Chem. Soc. 130 (11), 3310 (2008)
11. “Direct Observation of Geometrical Phase Transitions in Mesoscopic Superconductors by Scanning Tunneling Microscopy,” G. Karapetrov, J. Fedor, M. Iavarone, D. Rosenman and W. Kwok, Phys. Rev. Lett. 95, 167002 (2005)
12. “Effect of disorder in MgB2 thin films,” M. Iavarone, R. Di Capua, A.E. Koshelev, and W.K. Kwok, F. Chiarella, R. Vaglio, W.N. Kang, E.M. Choi, H.J. Kim, S.I. Lee, A.V. Pogrebnyakov, J.M. Redwing, and X.X. Xi, Phys. Rev. B 71, 214502 (2005)
13. “Two-band superconductivity in MgB2” M. Iavarone, G. Karapetrov, A.E. Koshelev, W.K. Kwok, G.W. Crabtree, D.G. Hinks, W.N. Kang, E.M. Choi, H.J. Kim, S.I. Lee, Phys. Rev. Lett 89, 1870021-4 (2002)