Global phase diagram of the high-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi>T</mml:mi><mml:mi>c</mml:mi></mml:msub></mml:mrow></mml:math>cuprates

Chen, Han-Dong; Capponi, Sylvain; Alet, Fabien; Zhang, Shou-Cheng

doi:10.1103/physrevb.70.024516

Cited by 30 publications

(38 citation statements)

References 87 publications

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“…[12,18,19,20,21,22] At V =0, the doped regions of the stripes have nonzero SC amplitude at the mean-field level. [23] In view of the dramatically different behavior along Paths 1 and 2, we conclude that in our model there is no unique AF→SC path. This is in agreement with experiments since La 2−x Sr x CuO 4 (LSCO) and others have stripes, [7,8,24] while Ca 2−x Na x CuO 2 Cl 2 has a more complex inhomogeneous pattern.…”

Section: A Phase Diagram In the Clean Limitmentioning

confidence: 64%

Areas of superconductivity and giant proximity effects in underdoped cuprates

et al. 2005

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Phenomenological models for the antiferromagnetic (AF) vs. d-wave superconductivity competition in cuprates are studied using conventional Monte Carlo techniques. The analysis suggests that cuprates may show a variety of different behaviors in the very underdoped regime: local coexistence or first-order transitions among the competing orders, stripes, or glassy states with nanoscale superconducting (SC) puddles. The transition from AF to SC does not seem universal. In particular, the glassy state leads to the possibility of "colossal" effects in some cuprates, analog of those in manganites. Under suitable conditions, non-superconducting Cu-oxides could rapidly become superconducting by the influence of weak perturbations that align the randomly oriented phases of the SC puddles in the mixed state. Consequences of these ideas for thin-film and photoemission experiments are discussed.

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Section: A Phase Diagram In the Clean Limitmentioning

confidence: 64%

Areas of superconductivity and giant proximity effects in underdoped cuprates

et al. 2005

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“…6,16 In the latter case, the field-induced decrease in thermal conductivity was interpreted as a field-induced thermal metalinsulator transition presumably as a consequence of a competing order with superconductivity such as spindensity-wave 39 . The existence of such competing order has been theoretically predicted in the phase diagram of cuprates when disorder plays a prominent role 40 . Sutherland et al 41 report that, in contrast to LSCO, underdoped YBCO , for a doping level of δ ≈ 0.33 (corresponding to the onset of superconductivity), is a thermal metal.…”

Section: Test Of the Wiedemann-franz Lawmentioning

confidence: 97%

Heat transport inBi2+xSr2−xCuO6+δ: Departure from the Wiedemann-Franz law i

et al. 2005

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We present a study of heat transport in the cuprate superconductor Bi2+xSr2−xCuO 6+δ at subkelvin temperatures and in magnetic fields as high as 25T. In several samples with different doping levels close to optimal, the linear-temperature term of thermal conductivity was measured both at zero-field and in presence of a magnetic field strong enough to quench superconductivity. The zerofield data yields a superconducting gap of reasonable magnitude displaying a doping dependence similar to the one reported in other families of cuprate. The normal-state data together with the results of the resistivity measurements allows us to test the Wiedemann-Franz(WF) law, the validity of which was confirmed in an overdoped sample in agreement with previous studies. In contrast, a systematic deviation from the WF law was resolved for samples displaying either a lower doping content or a higher disorder. Thus, in the vicinity of the metal-insulator cross-over, heat conduction in the zero-temperature limit appears to become significantly larger than predicted by the WF law. Possible origins of this observation are discussed.

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“…In fact, quenched disorder has such an extraordinary and unusual influence because of the possible first-order nature of the clean limit M-I transition (which is not experimentally accessible), and the effective low-dimensionality of the transition-metal oxides under consideration. Note that in some scenarios 19,20 a similar sharp transition AF-SC is invoked, but the influence of quenched disorder has not been explored. In our case, quenched disorder is crucial to produce the intermediate state between the AF and SC phases.…”

Section: Introductionmentioning

confidence: 99%

One-particle spectral function and local density of states in a phenomenological mixed-phase model for high-temperature superconductors

et al. 2006

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The dynamical properties of a recently introduced phenomenological model for high temperature superconductors are investigated. In the clean limit, it was observed that none of the homogeneous or striped states that are induced by the model at low temperatures can reproduce the recent angleresolved photoemission results for LSCO (Yoshida et al., Phys. Rev. Lett., 91, 027001 (2003)), that show a signal with two branches in the underdoped regime. On the other hand, upon including quenched disorder in the model and breaking the homogeneous state into "patches" that are locally either superconducting or antiferromagnetic, the two-branch spectra can be reproduced. In this picture, the nodal regions are caused by d-wave superconducting clusters. Studying the density of states (DOS), a pseudogap is observed, caused by the mixture of the gapped antiferromagnetic state and a d-wave superconductor. The local DOS can be interpreted using a mixed-phase picture, similarly as observed in tunneling experiments. It is concluded that a simple phenomenological model for cuprates can capture many of the features observed in the underdoped regime of these materials.

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Global phase diagram of the high-Tccuprates

Cited by 30 publications

References 87 publications

Areas of superconductivity and giant proximity effects in underdoped cuprates

Areas of superconductivity and giant proximity effects in underdoped cuprates

Heat transport inBi2+xSr2−xCuO6+δ: Departure from the Wiedemann-Franz law i

One-particle spectral function and local density of states in a phenomenological mixed-phase model for high-temperature superconductors

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