Experimental evidence in favor of the fluctuation origin of the transverse-resistance increase near the edge of the superconducting transition in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Bi</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Sr</mm

Balestrino, G.; Marinelli, M.; Milani, E.; Aa, Varlamov; Yu, Li

doi:10.1103/physrevb.47.6037

Cited by 47 publications

(13 citation statements)

References 18 publications

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“…The observed resistance peak is very reminiscent of similar anomalous peaks studied in the context of c-axis transport in cuprate superconductors, [65][66][67] magnetoresistance in dirty films, 68 as well as magnetoresistance in granular electronic systems. 69 In all these cases, the anomalous peak has been explained using the phenomenon of superconducting fluctuations.…”

Section: Resistance Peak Due To Superconducting Fluctuations − Asupporting

confidence: 61%

Microscopic theory for a ferromagnetic nanowire/superconductor heterostructure: Transport, fluctuations, and topological superconductivity

Takei

Galitski

2012

Phys. Rev. B

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Motivated by the recent experiment of Wang et al. [Nature Physics 6, 389 (2010)], who observed a highly unusual transport behavior of ferromagnetic Cobalt nanowires proximity-coupled to superconducting electrodes, we study proximity effect and temperature-dependent transport in such a mesoscopic hybrid structure. It is assumed that the asymmetry in the tunneling barrier gives rise to the Rashba spin-orbit-coupling in the barrier that enables induced p-wave superconductivity in the ferromagnet to exist. We first develop a microscopic theory of Andreev scattering at the spin-orbit-coupled interface, derive a set of self-consistent boundary conditions, and find an expression for the p-wave mini-gap in terms of the microscopic parameters of the contact. Second, we study temperature-dependence of the resistance near the superconducting transition and find that it should generally feature a fluctuation-induced peak. The upturn in resistance is related to the suppression of the singleparticle density of states due to the formation of fluctuating pairs, whose tunneling is suppressed. In conclusion, we discuss this and related setups involving ferromagnetic nanowires in the context of one-dimensional topological superconductors. It is argued that to realize unpaired end Majorana modes, one does not necessarily need a half-metallic state, but a partial spin polarization may suffice. Finally, we propose yet another related class of material systems -ferromagnetic semiconductor wires coupled to ferromagnetic superconductors -where direct realization of Kitaev-Majorana model should be especially straightforward.

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Section: Resistance Peak Due To Superconducting Fluctuations − Asupporting

confidence: 61%

Microscopic theory for a ferromagnetic nanowire/superconductor heterostructure: Transport, fluctuations, and topological superconductivity

Takei

Galitski

2012

Phys. Rev. B

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“…The quantitative agreement of the transverse¯uctuation theory outlined in section 6.3 with the experimental data was proved shortly after its proposal [31,32,90] by ® tting the resistivity peaks of BSCCO and YBCO samples. The former shows good metallic behaviour far from the transition, and thus has a relatively small c-axis resistivity peak (® gure 19).…”

Section: Out-of-plane Resistance:¯uctuation Origin Of the C-axis Peakmentioning

confidence: 97%

“…In (74), we have introduced a cuto in the integral at jqj = qmax, where´q 2 max 1, as in [29,31,32]. This cuto arises from the q-dependence of the vertices and of the Green's functions, which had been neglected in comparison with the contribution from the propagator, and is appropriate for both the clean and dirty limits.…”

Section: Contributions From¯uctuations Of the Density Of Statesmentioning

confidence: 99%

“…In [31] the theory was ® t to data from 2212 BSCCO ® lms grown on misaligned substrates (to allow measurement of c-axis resistivity on epitaxial ® lms) in the temperature region 93± 110 K. The ® t used only the DOS contribution since the temperatures are far enough from Tc for the AL contribution to be negligible. In this way, using a single ® tting parameter representing the amplitude of the DOS uctuation correction to conductivity, the agreement of the logarithmic increase of resistivity with experimental data was proven.…”

Section: Out-of-plane Resistance:¯uctuation Origin Of the C-axis Peakmentioning

confidence: 99%

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The role of density of states fluctuations in the normal state properties of highT_csuperconductors

Varlamov

Balestrino

Milani

et al. 1999

Advances in Physics

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144

112

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“…Two different possible origins were proposed. According to the first one, by [13,14], the phenomenon should be related to the superconducting transition itself: we would be dealing with an increase of the resistivity near T c due to the diffusion of free electrons by Cooper pairs. The second proposition, which we have made in [9,15], contests Balestrino's explanation and suggests another origin, not related to the superconducting transition but involving an increase of the Fermi level (hole-filling) with decreasing temperature.…”

Section: Discussionmentioning

confidence: 99%

Hole-Filling above Tc, at the Origin of the In-Plane Resistivity Anomaly in Bi-2212 Crystals

Boulesteix

Marietti

Monnereau³

et al. 2000

phys. stat. sol. (a)

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We have observed a sharp peak (100%) in the in-plane resistivity r ab just above T c , in Bi-2212 crystals, in agreement with previous results from Han et al. who attributed this anomaly to the ªquasi-reentrant behaviourº already observed for polycrystalline samples. This explanation is very likely unadapted to these crystals and we propose another one related to a model we had used to fit r c T curves for Bi-2212 underdoped crystals, namely, an increase of the Fermi level (hole-filling) with decreasing temperature, above T c , probably due to a change in the Bi±O or Cu±O bonds. A previously reported c-axis lattice anomaly, occurring in the same temperature range, is most probably related to this bonding alteration.Nous avons observe Â, pour des cristaux de Bi-2212, un pic intense (100%) de re Â sistivite Â r ab (dans le plan des feuillets). Ceci est en accord avec des re Â sultats ante Â rieurs de Han et al. qui ont atttribue Â l'anomalie en question au comportement ªquasi-re Â entrantº caracte Â ristique des e Â chantillons polycristallins. Cette interpre Â tation ne nous semble pas pertinente dans le cas de nos cristaux et nous proposons une autre origine (d'apre Á s un mode Á le que nous avions utilise Â pour ajuster les courbes r c T de cristaux de Bi-2212 sous-dope Â s) base Â e sur une e Â le Â vation du niveau de Fermi lorsque la tempe Â rature de Â croõ Ãt (au-dessus de T c ). D'autres auteurs constatent par ailleurs une variation du parame Á tre de maille c, qui se produit dans la me Ã me gamme de tempe Â rature. Ces deux phe Â nome Á nes sont probablement lie Â s a Á une modification des liaisons Bi±O ou Cu±O.

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Experimental evidence in favor of the fluctuation origin of the transverse-resistance increase near the edge of the superconducting transition inBi2Sr

Cited by 47 publications

References 18 publications

Microscopic theory for a ferromagnetic nanowire/superconductor heterostructure: Transport, fluctuations, and topological superconductivity

Microscopic theory for a ferromagnetic nanowire/superconductor heterostructure: Transport, fluctuations, and topological superconductivity

The role of density of states fluctuations in the normal state properties of highT_csuperconductors

Hole-Filling above Tc, at the Origin of the In-Plane Resistivity Anomaly in Bi-2212 Crystals

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Experimental evidence in favor of the fluctuation origin of the transverse-resistance increase near the edge of the superconducting transition inBi2Sr

Cited by 47 publications

References 18 publications

Microscopic theory for a ferromagnetic nanowire/superconductor heterostructure: Transport, fluctuations, and topological superconductivity

Microscopic theory for a ferromagnetic nanowire/superconductor heterostructure: Transport, fluctuations, and topological superconductivity

The role of density of states fluctuations in the normal state properties of highTcsuperconductors

Hole-Filling above Tc, at the Origin of the In-Plane Resistivity Anomaly in Bi-2212 Crystals

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The role of density of states fluctuations in the normal state properties of highT_csuperconductors