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Two regimes in the magnetic field response of superconducting MgB2 (Articolo in rivista)

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Two regimes in the magnetic field response of superconducting MgB2 (Articolo in rivista) (literal)

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Kohen, A; Giubileo, F; Proslier, T; Bobba, F; Cucolo, AM; Sacks, W; Noat, Y; Troianovski, A; Roditchev, D (2007)
Two regimes in the magnetic field response of superconducting MgB2
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Kohen, A; Giubileo, F; Proslier, T; Bobba, F; Cucolo, AM; Sacks, W; Noat, Y; Troianovski, A; Roditchev, D (literal)

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Univ Paris 06, INSP, CNRS, UMR 7588, F-75015 Paris, France; Univ Paris 07, INSP, CNRS, UMR 7588, F-75015 Paris, France; Univ Salerno, CNR, INFM, Lab Reg Supermat, I-84081 Baronissi, SA, Italy (literal)

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Using Scanning Tunneling Microscope at low temperature we explore the superconducting phase diagram in the pi-band of the two-band superconductor MgB2. In this band the peculiar shape of the local tunneling spectra and their dynamics in the magnetic field reveal the complex character of the quasiparticle density of states (DOS). The gap in the DOS is first rapidly filled with states in raising the magnetic field up to 0.5 T and then slowly approaches the normal state value: the gap is observed up to 2 T. Such a change in the DOS dynamics suggests the existence of two terms in the DOS of the pi-band: a first one, reflecting an intrinsic superconductivity in the band and a second one, originating from an inter-band coupling to the sigma-band. Our findings allow a deeper understanding of the unique phase diagram of MgB2. (literal)

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