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Upper Critical Fields up to 60T in Dirty Magnesium Diboride Thin Films | | C.Ferdeghini
; V.Ferrando
; C.Tarantini
; E.Bellingeri
; G.Grasso
; A.Malagoli
; D.Marre’
; M.Putti
; P.Manfrinetti
; A.Pogrebnyakov
; J.M. Redwing
; X.X. Xi
; R.Felici
; E.Haanappel
; | | Date: |
16 Nov 2004 | | Subject: | Superconductivity | cond-mat.supr-con | | Abstract: | Upper critical fields of several magnesium diboride thin films were measured up to 28 T at the Grenoble High Magnetic Field Laboratory (GHMFL) in Grenoble and up to 60 T at the Laboratoire National des Champs Magnetiques Pulses (LNCMP) in Toulouse. The samples were prepared both by pulsed laser deposition (PLD) and hybrid physical chemical vapour deposition (HPCVD) technique; they have critical temperatures between 29 and 39 K and normal state resistivities between 5 and 250 μohmcm; one of them has been intentionally doped with carbon. The measured critical fields were exceptionally high; we obtained the record value of 52 T at 4.2 K in the parallel orientation. In contrast with the BCS predictions, no saturation in Hc2 at low temperature was observed. Furthermore, films with a wide range of resistivity values showed similar critical fields, suggesting that in a two band system resistivity and Hc2 are not trivially linked. The high Hc2 values seem to be related with the expanded c-axis. The structure of one of the samples was carefully investigated with X-ray diffraction at European Synchrotron Radiation Facility (ESRF) in Grenoble. | | Source: | arXiv, cond-mat/0411404 | | Services: | Forum | Review | PDF | Favorites | |
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