Coexistence of stripes and superconductivity: Tc amplification in a superlattice of superconducting stripes

Bianconi, A.; Castro, D. Di; Bianconi, Ginestra; Pifferi, Augusto; Saini, N. L.; Chou, F. C.; Johnston, D. C.; Colapietro, Marcello

doi:10.1016/s0921-4534(00)00950-3

Cited by 57 publications

(55 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…While present in all cuprates [19][20][21][22][23], it is not well understood so that its consequences for the various experimental probes are not clear. In NMR, one finds various degrees of line broadening in the various cuprates (see e.g., [24]) typically caused by concomitant charge and spin density variations [25].…”

Section: Introductionmentioning

confidence: 99%

Contrasting Phenomenology of NMR Shifts in Cuprate Superconductors

2017

View full text Add to dashboard Cite

Nuclear magnetic resonance (NMR) shifts, if stripped of their uncertainties, must hold key information about the electronic fluid in the cuprates. The early shift interpretation that favored a single-fluid scenario will be reviewed, as well as recent experiments that reported its failure. Thereafter, based on literature shift data for planar Cu, a contrasting shift phenomenology for cuprate superconductors is developed, which is very different from the early view while being in agreement with all published data. For example, it will be shown that the hyperfine scenario used up to now is inadequate as a large isotropic shift component is discovered. Furthermore, the changes of the temperature dependences of the shifts above and below the superconducting transitions temperature proceed according to a few rules that were not discussed before. It appears that there can be substantial spin shift at the lowest temperature if the magnetic field is perpendicular to the CuO 2 plane, which points to a localization of spin in the 3d(x 2 − y 2 ) orbital. A simple model is presented based on the most fundamental findings. The analysis must have new consequences for theory of the cuprates.

show abstract

Section: Introductionmentioning

confidence: 99%

Contrasting Phenomenology of NMR Shifts in Cuprate Superconductors

2017

View full text Add to dashboard Cite

show abstract

“…In addition, to design new BiS2-based superconductors, we have to consider the local-scale crystal structure and physical properties. Tuning the internal strain sometimes results in local phase separation, and the coexistence of local phase separation and superconductivity has been observed in several layered superconductors [41][42][43][44][45]. Thus, understanding the crystal structure and superconducting (electronic) states on the local scale is very important for developing new layered In addition, to design new BiS 2 -based superconductors, we have to consider the local-scale crystal structure and physical properties.…”

Section: Materials Design Strategies For the Bis2-based Superconductormentioning

confidence: 99%

Discovery of BiS2-Based Superconductor and Material Design Concept

Mizuguchi

2017

Condensed Matter

View full text Add to dashboard Cite

Abstract:In 2012, we discovered new layered superconductors whose superconducting states emerge in the BiS 2 layers. Since their crystal structure, composed of alternate stacks of BiS 2 conduction layers and electrically insulating (blocking) layers, is similar to those of cuprate and Fe-based superconductors, many researchers have explored new BiS 2 -based superconductors and have studied the physical and chemical properties of the BiS 2 -based superconductors. In this paper, we present the histories of the discovery of the first BiS 2 -based superconductor, Bi 4 O 4 S 3 , and the second one, LaO 1−x F x BiS 2 . The structural variation of the BiS 2 -based superconductor family is briefly introduced. Then, we show the material design concept for the emergence of bulk superconductivity in BiS 2 -based compounds. At the end, a possible strategy for the enhancement of the transition temperature in the BiS 2 -based superconductors is proposed. . Those layered superconductors have a layered structure composed of alternate stacks of conducting (superconducting) and insulating (blocking) layers. The FeAs layer and CuO 2 plane are the essential structures for the emergence of superconductivity in Fe-based and cuprate superconductors, respectively. Namely, by utilizing the structural flexibility, new superconductors with various stacking structures could be designed by changing the blocking layer and/or the thickness of the superconducting planes. Therefore, I aimed to discover a new layered superconductor with a new type of superconducting layer other than the FeAs layer and CuO 2 plane.To discover new layered superconductors, experience in the material design of the Fe-based superconductor family is very useful. A typical crystal structure of the Fe-based superconductor is the ZrSiCuAs-type (P4/nmm) structure, for example LaOFeAs [1]. As shown in Figure 1a, the crystal structure of LaOFeAs is composed of the FeAs superconducting layer and the LaO blocking layer. Among layered compounds, the ZrSiCuAs-type structure is one of the typical structures. For example, BiOCuSe, whose structure is composed of a CuSe conducting layer and a BiO blocking layer, is a famous thermoelectric material [4]. When substituting the CuSe layer of BiOCuSe with a CuS layer, we obtain BiOCuS with the ZrSiCuAs-type structure.

show abstract

“…Clear anomalies are observed in the behaviour of different observable quantities such as the resistivity and the optical transmission [1,2]. The origin of the mesoscale phase separation phenomenon responsible for a variety of unusual phenomena is due to the appearance of voxels of competing thermodynamic phases inside a host phase [3][4][5][6]. Transition metals and rare earth oxides, as for example high temperature superconductors, as cuprates or pnictides present multiple electronic states with different orbital symmetries at the Fermi energy and competing anisotropic Coulomb, magnetic and electron-lattice short range interactions together with long range Coulomb and elastic interaction, giving complex lattice architectures and a rich variety of different coexisting electronic and magnetic phases.…”

Section: Introductionmentioning

confidence: 99%

Phase Separations in Highly Correlated Materials

Marcelli

2016

Acta Phys. Pol. A

View full text Add to dashboard Cite

The X-ray absorption near edge structure spectroscopy is a unique powerful local and fast experimental method to study complex systems since it probes the nanoscale structure around selected atoms giving evidence for different local and instantaneous phases present in multiscale highly correlated granular systems. Transition metals and rare earth oxides like manganites, cuprates or pnictides superconductors show a rich variety of different competing structural, electronic and magnetic phases, which spatially coexist forming complex lattice textures. Many recent experimental data have pointed out the presence of arrested phase separation and the interplay of different phases occurring from nano-to micrometer-scale. This scenario opens the possibility to manipulate the mesoscopic phases to get new material functionalities. Therefore there is increasing need to develop methods to probe morphology and phase distribution at multiple length scales. Actually, combining X-ray imaging at high spatial resolution with µ-XANES spectroscopy both mesoscale, nanoscale and atomic structural changes can be identified. The µ-XANES spectroscopy technique is rapidly growing to investigate adaptive matter, high temperature superconductors, complex materials showing arrested phase separation at the mesoscale. IntroductionIt is well known that phase separation occurs where two or more phases with comparable free energies coexist giving two or more macroscopic phases each one with a large coherence length, however there is growing scientific interest for the case of arrested phase separations in transition metal oxides where two or more phases form complex textures extending in the mesoscale between the atomic scale and the macroscopic world, made of small domains with a size ranging from nanoscale to micron-scale. The mesoscale phase separation leads to strong anomalies or dramatic changes of system properties and material functionality. Clear anomalies are observed in the behaviour of different observable quantities such as the resistivity and the optical transmission [1,2]. The origin of the mesoscale phase separation phenomenon responsible for a variety of unusual phenomena is due to the appearance of voxels of competing thermodynamic phases inside a host phase [3][4][5][6]. Transition metals and rare earth oxides, as for example high temperature superconductors, as cuprates or pnictides present multiple electronic states with different orbital symmetries at the Fermi energy and competing anisotropic Coulomb, magnetic and electron-lattice short range interactions together with long range Coulomb and elastic interaction, giving complex lattice architectures and a rich variety of different coexisting electronic and magnetic phases. Their interplay plays a key role in colossal magnetoresistance materials [7,8], ferroelectrics [9,10] and in high temperature superconductors (HTS) showing arrested phase separation at mesoscopic or nanoscopic length scales [11][12][13][14][15].

show abstract

Coexistence of stripes and superconductivity: Tc amplification in a superlattice of superconducting stripes

Cited by 57 publications

References 20 publications

Contrasting Phenomenology of NMR Shifts in Cuprate Superconductors

Contrasting Phenomenology of NMR Shifts in Cuprate Superconductors

Discovery of BiS2-Based Superconductor and Material Design Concept

Phase Separations in Highly Correlated Materials

Contact Info

Product

Resources

About