Type-1.5 Superconductivity

Victor Moshchalkov; Mariela Menghini; T. Nishio; Q. H. Chen; A. V. Silhanek; V. H. Dao; L. F. Chibotaru; N. D. Zhigadlo; J. Karpinski

doi:10.1103/PhysRevLett.102.117001

Type-1.5 Superconductivity

Victor Moshchalkov, Mariela Menghini, T. Nishio, Q. H. Chen, A. V. Silhanek, V. H. Dao, L. F. Chibotaru, N. D. Zhigadlo, J. Karpinski

DOI 10.1103/PhysRevLett.102.117001 · Physical Review Letters

T1

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Abstract

We demonstrate the existence of a novel superconducting state in high quality two-component MgB2 single crystalline superconductors where a unique combination of both type-1 (λ1/ξ1<1/2) and type-2 (λ2/ξ2>1/2) superconductor conditions is realized for the two components of the order parameter. This condition leads to a vortex-vortex interaction attractive at long distances and repulsive at short distances, which stabilizes unconventional stripe- and gossamerlike vortex patterns that we have visualized in this type-1.5 superconductor using Bitter decoration and also reproduced in numerical simulations.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	38.6	Pressure unresolved	unknown
Ba0.6K0.4Fe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown