We measured the static uniform spin susceptibility of Ba(Fe1-xRhx)2As2iron-based superconductors, over a broad range of doping (0.041x0.094) and magnetic fields. At small fields (H1kOe) we observed, above the transition temperature Tc, the occurrence of precursor diamagnetism, which is not ascribable to the Ginzburg-Landau theory. On the contrary, our data agree with a phase fluctuation model, which has been used to interpret a similar phenomenology occurring in the high-Tccuprate superconductors. Additionally, in the presence of strong fields, the unconventional fluctuating diamagnetism is suppressed, whereas Ginzburg-Landau fluctuations are found, in agreement with literature.

Non-conventional superconducting fluctuations in Ba(Fe1−xRhx)2As2 iron-based superconductors / L. Bossoni, L. Romanò, P. C. Canfield, A. Lascialfari. - In: JOURNAL OF PHYSICS. CONDENSED MATTER. - ISSN 0953-8984. - 26:40(2014).

Non-conventional superconducting fluctuations in Ba(Fe1−xRhx)2As2 iron-based superconductors

A. Lascialfari
2014

Abstract

We measured the static uniform spin susceptibility of Ba(Fe1-xRhx)2As2iron-based superconductors, over a broad range of doping (0.041x0.094) and magnetic fields. At small fields (H1kOe) we observed, above the transition temperature Tc, the occurrence of precursor diamagnetism, which is not ascribable to the Ginzburg-Landau theory. On the contrary, our data agree with a phase fluctuation model, which has been used to interpret a similar phenomenology occurring in the high-Tccuprate superconductors. Additionally, in the presence of strong fields, the unconventional fluctuating diamagnetism is suppressed, whereas Ginzburg-Landau fluctuations are found, in agreement with literature.
iron-based superconductors; superconducting fluctuations; superconductivity
Settore FIS/03 - Fisica della Materia
Settore FIS/01 - Fisica Sperimentale
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/247315
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