Superconducting properties of a textured NbN film from<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mtext>N</mml:mtext><mml:mprescripts /><mml:none /><mml:mrow><mml:mn>93</mml:mn></mml:mrow></mml:mmultiscripts><mml:mtext>b</mml:mtext></mml:mrow></mml:math>NMR relaxation and magnetization measurements

Lascialfari, A.; Rigamonti, A.; Bernardi, Ettore; Corti, M.; Gauzzi, A.; Villégier, Jean-Claude

doi:10.1103/physrevb.80.104505

Cited by 7 publications

(6 citation statements)

References 37 publications

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“…Within the study of superconductivity, the possibility that liquid vortex excitations survive above T c , leading to local superconductivity, remains a key open problem, despite the variety of experimental and theoretical efforts. [1][2][3][4][5][6] Among all the experimental tools, the measure of the magnetization [7][8][9][10] is the most straightforward, as it gives a clear diamagnetic response M f l , as soon as the Cooper pairs are formed, provided to subtract possible paramagnetic contributions, occurring at a temperature above the onset of the fluctuations. In this regard, the Ginzburg-Landau (GL) theory predicts, for evanescent fields H, a diamagnetic magnetization linear in H for T ≫ T c , and accordingly a susceptibility χ dia ∝ −ǫ D/2−2 , where ǫ = (T − T c )/T c is the reduced temperature and D is the system dimensionality.…”

Section: Introductionmentioning

confidence: 99%

Non-conventional superconducting fluctuations in Ba(Fe_1−xRh_x)₂As₂ iron-based superconductors

Bossoni¹,

Romanò²,

Canfield³

et al. 2014

J. Phys.: Condens. Matter

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We measured the static uniform spin susceptibility of Ba(Fe1−xRhx)2As2 iron-based superconductors, over a broad range of doping (0.041 ≤ x ≤ 0.094) and magnetic fields. At small fields (H ≤ 1 kOe) 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 fit a phase fluctuation model, which has been used to interpret a similar phenomenology occurring in the high-Tc cuprate superconductors. On the other hand, in presence of strong fields the unconventional fluctuating diamagnetism is suppressed, whereas 3D fluctuations are found, in agreement with literature.

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Section: Introductionmentioning

confidence: 99%

Non-conventional superconducting fluctuations in Ba(Fe_1−xRh_x)₂As₂ iron-based superconductors

Bossoni¹,

Romanò²,

Canfield³

et al. 2014

J. Phys.: Condens. Matter

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“…2) and NbN (Ref. 3,4)), a transition from a superconductor to a Cooper pair insulator in TiN (Ref. 5), or a magnetostructural phase transition (MPT) as a function of temperature in CrN (Ref.…”

Section: Introductionmentioning

confidence: 99%

Electronic structure of CrN: A comparison between different exchange correlation potentials

et al. 2012

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We report a series of electronic structure calculations for CrN using different exchange correlation potentials: PBE, LDA+U , the Tran-Blaha modified Becke-Johnson, and hybrid functionals. In every case, our calculations show that the onset of magnetism in CrN should be accompanied by a gap opening. The experimentally found antiferromagnetic order always leads to an insulating behavior. Our results give further evidence that the Tran-Blaha functional is very useful for treating the electronic structure of correlated semiconductors allowing a parameter free description of the system. Hybrid functionals are also well capable of describing the electronic structure of CrN. The analysis of the system is complemented with our calculations of the thermopower that are in agreement with the experimental data. 71.27.+a

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“…The irreversibility line was estimated looking at the temperature where the ZFC curve departs from the FC one, as in Ref. 24. This is the temperature where the magnetization is sensitive to a change in the dynamics of the FLL.…”

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confidence: 99%

NMR investigation of vortex dynamics in the Ba(Fe0.93Rh0.07)2As<

et al. 2012

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75As NMR spin-lattice relaxation (1/T 1 ) and spin-echo decay (1/T 2 ) rate measurements were performed in a single crystal of Ba(Fe 0.93 Rh 0.07 ) 2 As 2 superconductor. Below the superconducting transition temperature T c , when the magnetic field H is applied along the c axes, a peak in both relaxation rates is observed. Remarkably that peak is suppressed for H ⊥ c. Those maxima in 1/T 1 and 1/T 2 have been ascribed to the flux lines lattice motions and the corresponding correlation times and pinning energy barriers have been derived on the basis of a heuristic model. Further information on the flux lines motion was derived from the narrowing of 75 As NMR linewidth below T c and found to be consistent with that obtained from 1/T 2 measurements. All the experimental results are described in the framework of thermally activated vortices motions.

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Superconducting properties of a textured NbN film fromN93bNMR relaxation and magnetization measurements

Cited by 7 publications

References 37 publications

Non-conventional superconducting fluctuations in Ba(Fe_1−xRh_x)₂As₂ iron-based superconductors

Non-conventional superconducting fluctuations in Ba(Fe_1−xRh_x)₂As₂ iron-based superconductors

Electronic structure of CrN: A comparison between different exchange correlation potentials

NMR investigation of vortex dynamics in the Ba(Fe0.93Rh0.07)2As<

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Superconducting properties of a textured NbN film fromN93bNMR relaxation and magnetization measurements

Cited by 7 publications

References 37 publications

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

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

Electronic structure of CrN: A comparison between different exchange correlation potentials

NMR investigation of vortex dynamics in the Ba(Fe0.93Rh0.07)2As<

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Product

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Non-conventional superconducting fluctuations in Ba(Fe_1−xRh_x)₂As₂ iron-based superconductors

Non-conventional superconducting fluctuations in Ba(Fe_1−xRh_x)₂As₂ iron-based superconductors