Universal origin of unconventional<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mn>1</mml:mn><mml:mo>/</mml:mo><mml:mi>f</mml:mi></mml:mrow></mml:math>noise in the weak-localization regime

Barone, C.; Romeo, Francesco; Galdi, Alice; Orgiani, P.; Maritato, L.; Guarino, Alessio; Nigro, A.; Pagano, S.

doi:10.1103/physrevb.87.245113

Cited by 25 publications

(35 citation statements)

References 26 publications

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“…This would result in a linear current dependence of S I . Such behavior has been observed in manganite thin films [29] and high-T c superconducting cuprates [30]. In the publications on this behavior, the linear current dependence is ascribed to the effect of weak localization.…”

Section: Introductionmentioning

confidence: 74%

Nonequilibrium mesoscopic conductance fluctuations as the origin of 1/f noise in epitaxial graphene

et al. 2016

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We investigate the 1/f noise properties of epitaxial graphene devices at low temperatures as a function of temperature, current, and magnetic flux density. At low currents, an exponential decay of the 1/f noise power spectral density with increasing temperature is observed that indicates mesoscopic conductance fluctuations as the origin of 1/f noise at temperatures below 50 K. At higher currents, deviations from the typical quadratic current dependence and the exponential temperature dependence occur as a result of nonequilibrium conditions due to current heating. By applying the Kubakaddi theory [S. S. Kubakaddi, Phys. Rev. B 79, 075417 (2009)], a model describing the 1/f noise power spectral density of nonequilibrium mesoscopic conductance fluctuations in epitaxial graphene is developed and used to determine the energy loss rate per carrier. In the regime of Shubnikov-de Haas oscillations, a strong increase of 1/f noise is observed, which we attribute to an additional conductance fluctuation mechanism due to localized states in quantizing magnetic fields. When the device enters the regime of quantized Hall resistance, the 1/f noise vanishes. It reappears if the current is increased and quantum Hall breakdown sets in.

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Section: Introductionmentioning

confidence: 74%

Nonequilibrium mesoscopic conductance fluctuations as the origin of 1/f noise in epitaxial graphene

et al. 2016

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“…In the limit of strong spin-orbit coupling in correlated materials, the eq. (4) can be reduced to521:…”

Section: Resultsmentioning

confidence: 99%

Evidence of weak localization in quantum interference effects observed in epitaxial La0.7Sr0.3MnO3 ultrathin films

Niu

Gao

Wang

et al. 2016

Sci Rep

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Quantum interference effects (QIEs) dominate the appearance of low-temperature resistivity minimum in colossal magnetoresistance manganites. The T1/2 dependent resistivity under high magnetic field has been evidenced as electron-electron (e-e) interaction. However, the evidence of the other source of QIEs, weak localization (WL), still remains insufficient in manganites. Here we report on the direct experimental evidence of WL in QIEs observed in the single-crystal La0.7Sr0.3MnO3 (LSMO) ultrathin films deposited by laser molecular beam epitaxy. The sharp cusps around zero magnetic field in magnetoresistance measurements is unambiguously observed, which corresponds to the WL effect. This convincingly leads to the solid conclusion that the resistivity minima at low temperatures in single-crystal manganites are attributed to both the e-e interaction and the WL effect. Moreover, the temperature-dependent phase-coherence length corroborates the WL effect of LSMO ultrathin films is within a two-dimensional localization theory.

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“…2, the aging of FeSe thin films produces an upturn of the resistivity by lowering the temperature below T min , associated to a characteristic feature of weak-localization (WL) effects. In this respect, it has been demonstrated that nonequilibrium universal conductance fluctuations are established in the WL regime and give origin to a linear bias current dependence of the 1/f noise component [11], [12]. This also happens for the aged FeSe films, as shown in Fig.…”

Section: Resultsmentioning

confidence: 64%

Noise Spectroscopy Investigation of Aging Induced Degradation in Iron-Chalcogenide Superconductors

Mauro

Barone

Pagano

et al. 2016

IEEE Trans. Appl. Supercond.

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Iron-based superconductors are subjected to aging when exposed to unprotected environmental conditions, with a consequent degradation of their superconductive properties. The understanding of aging effects is important in view of practical applications. In this work, electric transport and voltage-noise measurements are reported on FeSe and FeSe 0.5 Te 0.5 thin films, just after fabrication and after long aging in protected environment. The pristine films show a superconducting transition at temperatures ranging from 9 to 12 K for FeSe and at 17 K for FeSe 0.5 Te 0.5 , and an overall metallic behavior above T c . Preserving the samples for several months in low humidity and low pressure conditions, the FeSe 0.5 Te 0.5 films show no clear modification of the electrical conduction mechanisms. Conversely, for the FeSe films, the superconductive transition is no longer present, at least for temperatures above 8 K, and an overall larger resistivity is observed, with a characteristic upturn at low temperatures (T < T min  50 K). An interpretation in terms of weak-localization processes is proposed.  Index Terms-Aging induced degradation, iron-based superconductors, noise spectroscopy, superconducting device noise, weak-localization effects.

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Universal origin of unconventional1/fnoise in the weak-localization regime

Cited by 25 publications

References 26 publications

Nonequilibrium mesoscopic conductance fluctuations as the origin of 1/f noise in epitaxial graphene

Nonequilibrium mesoscopic conductance fluctuations as the origin of 1/f noise in epitaxial graphene

Evidence of weak localization in quantum interference effects observed in epitaxial La0.7Sr0.3MnO3 ultrathin films

Noise Spectroscopy Investigation of Aging Induced Degradation in Iron-Chalcogenide Superconductors

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