Magnetic-Field–Induced Localization in the Normal State of Superconducting<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>La</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn><mml:mo>−</mml:mo><mml:mi mathvariant="italic">x</mml:mi></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi>Sr</mml:mi></mml:mrow><mml:mrow><mml:mi mathvariant="italic">x</mml:mi></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi>CuO</

Malinowski, A.; Cieplak, Marta Z.; Steenbergen, A.S. van; Perenboom, J.A.A.J.; Karpińska, Katarzyna; Berkowski, M.; Guha, Saikat; Lindenfeld, P.

doi:10.1103/physrevlett.79.495

Cited by 17 publications

(10 citation statements)

References 15 publications

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“…In the field and temperature range used in our experiments, the magnetoresistivity is positive for all our films, in agreement with the results of [19,20,21]. Our data on thin films differ from the results of references [7,16] on single crystals of La 2-x Sr x -CuO 4 with x = 0.08 and x = 0.13, where the magnetoresistivity in the limit of high fields was found to be negative.…”

Section: La 18 Sr 02 Cuosupporting

confidence: 88%

High field magnetoresistivity of epitaxial La2−xSrxCuO4 thin films

Vanacken

Weckhuysen

Wambecq

et al. 2005

Physica C: Superconductivity and its Applications

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A large positive magnetoresistivity (up to tens of percents) is observed in both underdoped and overdoped superconducting La 2-x Sr x CuO 4 epitaxial thin films at temperatures far above the superconducting critical temperature T c . For the underdoped samples, this magnetoresistance far above T c cannot be described by the Kohler rule and we believe it is to be attributed to the influence of superconducting fluctuations. In the underdoped regime, the large magnetoresistance is only present when at low temperatures superconductivity occurs. T he strong magnetoresistivity, which persists even at temperatures far above T c , can be related to the pairs forming eventually the superconducting state below T c . Our observations support the idea of a close relation between the pseudogap and the superconducting gap and provide new indications for the presence of pairs above T c .

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Section: La 18 Sr 02 Cuosupporting

confidence: 88%

High field magnetoresistivity of epitaxial La2−xSrxCuO4 thin films

Vanacken

Weckhuysen

Wambecq

et al. 2005

Physica C: Superconductivity and its Applications

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“…The data are instead consistent (not shown) with the variable-range hopping (VRH), although the range of available fields is too small here to observe an orders-of-magnitude change in ρ that is characteristic of VRH. A larger change was observed in some early studies5,22 of the H-field induced localization in underdoped LSCO with a similar T c (H = 0), and attributed to a 2D or 3D Mott VRH.…”

mentioning

confidence: 61%

Two-stage magnetic-field-tuned superconductor–insulator transition in underdoped La2−xSrxCuO4

et al. 2014

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In the underdoped pseudogap regime of cuprate superconductors, the normal state is commonly probed by applying a magnetic field (H). However, the nature of the H-induced resistive state has been the subject of a long-term debate, and clear evidence for a zero-temperature (T = 0) H-tuned superconductor-insulator transition (SIT) has proved elusive. Here we report magnetoresistance measurements in underdoped La 2−x Sr x CuO 4 , providing striking evidence for quantum critical behavior of the resistivity -the signature of a H-driven SIT. The transition is not direct: it is accompanied by the emergence of an intermediate state, which is a superconductor only at T = 0. Our finding of a two-stage H-driven SIT goes beyond the conventional scenario in which a single quantum critical point separates the superconductor and the insulator in the presence of a perpendicular H. Similar two-stage H-driven SIT, in which both disorder and quantum phase fluctuations play an important role, may also be expected in other copper-oxide high-temperature superconductors.The SIT is an example of a quantum phase transition (QPT): a continuous phase transition that occurs at T = 0, controlled by some parameter of the Hamiltonian of the system, such as doping or the external magnetic field 1 . A QPT can affect the behavior of the system up to surprisingly high temperatures. In fact, many unusual properties of various strongly correlated materials have been attributed to the proximity of quantum critical points (QCPs). An experimental signature of a QPT at nonzero T is the observation of scaling behavior with relevant parameters in describing the data. Although the SIT has been studied extensively 2 , even in conventional superconductors many questions remain about the perpendicular-field-driven SIT in two-dimensional (2D) or quasi-2D systems 3 . In high-T c cuprates (T c -transition temperature), which have a quasi-2D nature, early magnetoresistance (MR) experiments showed the suppression of superconductivity with high H, revealing the insulating behavior 4-6 and hinting at an underlying H-field-tuned SIT 7 . However,

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“…If that is the case, the search for strong Anderson localization at any length of the multimode (N c ≥ 2) conducting strip has no sense even without any inelastic scattering mechanisms. Probably, it is necessary to invent some extra conditions to make the interferential localization possible in such conductors, e.g., magnetic field, 49 surface roughness, 50 etc.…”

Section: B the Weak Scattering Approximationmentioning

confidence: 99%

“…In the limit of L ≫ N c ℓ, it follows from (48b) that the zero-order approximation in ∆ Tn is, strictly speaking, insufficient for calculating the function G nn (x, x ′ ). Nevertheless, since the scattering rate 1/τ (T ) n can only be less than or of the order of the level width 1/τ (ϕ) n , the appropriate correction to the conductance can be reasonably estimated by substituting into g (1) (L) the function G nn (x, x ′ ) obtained from (49) to the first order in ∆ Tn . A simple but tedious calculation brings about the following estimation of the corresponding correction to the conductance:…”

Section: A the Diagonal Conductancementioning

confidence: 99%

Elastic scattering as a cause of quantum dephasing: the conductance of two-dimensional imperfect conductors

Tarasov

2000

Waves in Random Media

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A method is proposed for studying wave and particle transport in disordered waveguide systems of dimension higher than unity by means of exact one-dimensionalization of the dynamic equations in the mode representation. As a particular case, the T = 0 conductance of a two-dimensional quantum wire is calculated, which exhibits ohmic behaviour, with length-dependent conductivity, at any conductor length exceeding the electron quasi-classical mean free path. The unconventional diffusive regime of charge transport is found in the range of conductor lengths where the electrons are commonly considered as localized. In quantum wires with more than one conducting channel, each being identified with the extended waveguide mode, the inter-mode scattering is proven to serve as a phase-breaking mechanism that prevents interference localization without real inelasticity of interaction.PACS numbers: 71.30.+h, 72.15.Rn, natural. Numerous attempts to interpret the results of Ref. 10 within the framework of a single-particle approach were made, in particular, by improving the scaling approach. 9 In this study, however, a fundamentally different strategy is chosen which is an alternative to the RG analysis. 24 We prefer to obtain the observables directly, while conclusions (though indirect) about the localization of electron states are made on the basis of the results.It is instructive to recall that working out, even without a profound spectral analysis, practical asymptotic methods for calculating the disorder-averaged many-particle characteristics (conductivity, density-density correlator, etc.) turned out to be more helpful for the establishment of a highly advanced theory of 1D random systems than the development of rigorous mathematical foundations. [25][26][27][28] The usefulness of such an approach can be attributed to the fact that in the context of the above-mentioned essentially perturbative methods one has managed to trace with the required accuracy the effect of mutual interference of quantum waves corresponding to multiply backscattered current carriers. In such a way, physical results entirely consistent with the anticipations based on mathematical predictions were eventually obtained. The present research was primarily induced by long-standing discontent associated with the lack of arguments of a comparable standard, either in favour of localization or against it, as applied to 2D systems of degenerate electrons subject to a static random potential.Commonly, the presence of inelastic scattering mechanisms is held responsible as a main cause of preventing quantum interference and, thus, Anderson localization. 29 Among these are the electron-phonon and electron-electron interactions and other conceivable methods of energy interchange between the electron bath and the environment. 30 These can lead to the loss of phase (meaning energy) memory or, in other words, phase coherence of electronic states. Note in this connection that in the 1D case the demand of energy coherence admits a large transfer of momentum for onefol...

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Magnetic-Field–Induced Localization in the Normal State of SuperconductingLa2−xSrxCuO

Cited by 17 publications

References 15 publications

High field magnetoresistivity of epitaxial La2−xSrxCuO4 thin films

High field magnetoresistivity of epitaxial La2−xSrxCuO4 thin films

Two-stage magnetic-field-tuned superconductor–insulator transition in underdoped La2−xSrxCuO4

Elastic scattering as a cause of quantum dephasing: the conductance of two-dimensional imperfect conductors

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