New Layered Fluorosulfide SrFBiS<sub>2</sub>

Lei, Hechang; Wang, K. F.; Abeykoon, Milinda; Božin, Emil S.; Petrović, C.

doi:10.1021/ic4018135

Cited by 95 publications

(109 citation statements)

References 36 publications

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“…At the same time in similar structure i.e. SrFBiS 2 compound, the superconductivity has been observed via hole doping that is attained by the substitution of La 3+ at Sr 2+ site [11,12]. Therefore it can be safely said that superconductivity appears via carrier doping in the vicinity of the insulating-like state of the parent BiS 2 based compounds.…”

Section: Introductionmentioning

confidence: 96%

Significant enhancement of superconductivity under Hydrostatic pressure in CeO0.5F0.5BiS2 superconductor

Jha

Kishan

Awana

2014

Solid State Communications

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Section: Introductionmentioning

confidence: 96%

Significant enhancement of superconductivity under Hydrostatic pressure in CeO0.5F0.5BiS2 superconductor

Jha

Kishan

Awana

2014

Solid State Communications

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“…el was obtained by the WiedemannFranz relation using the Lorenz number of 2.45  10 −8 WK −2 . l was 1.52.0 Wm −1 K −1 at temperatures between 300 and 623 K. This value is distinctly lower than that of isostructural SrBiS2F (l  2.7 Wm −1 K −1 ), 17) which is attributed to the lower speed of sound resulting from the heavier atomic mass of the Eu ions than that of Sr ions. 18) Notably, the relative density of the sample in this study is 90%.…”

mentioning

confidence: 79%

“…The absolute value of S is ~32 VK −1 at 300 K and it increases almost linearly up to 623 K. Both T and ST plots are similar to those of LaBiS2O1xFx (x  0.5), 7) suggesting that the charged carrier transport of EuBiS2F at these temperatures is primarily determined by the carrier concentration provided by oxide/fluoride layer, not by the hybridization between Eu 4f and Bi 6p electrons. value is distinctly lower than that of isostructural SrBiS2F (l  2.7 Wm −1 K −1 ), 17) which is attributed to the lower speed of sound resulting from the heavier atomic mass of the Eu ions than that of Sr ions. 18) Notably, the relative density of the sample in this study is 90%.…”

mentioning

confidence: 79%

Electrical and Thermal Transport of Layered Bismuth-Sulfide EuBiS₂F at Temperatures between 300 and 623 K

et al. 2015

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We demonstrate the electrical and thermal transport of the layered bismuth-based sulfide EuBiS2F from 300 to 623 K. Although significant hybridization between Eu 4f and Bi 6p electrons was reported previously, the carrier transport of the compound is similar to that of F-doped LaBiS2O, at least above 300 K. The lattice thermal conductivity is lower than that of isostructural SrBiS2F, which is attributed to the heavier atomic mass of Eu ions than that of Sr ions.Searching for novel thermoelectric materials is the most fundamental issue for the development of thermoelectrics because the maximum conversion efficiency of a thermoelectric device is primarily determined by the material's dimensionless figure of merit, ZT = S 2 T −1  −1 , where T, S, , and  denote the temperature, Seebeck coefficient, electrical resistivity, and thermal conductivity, respectively. 1) Bismuth telluride (Bi2Te3) and its related compounds have been the state-of-the-art thermoelectric materials at around room temperature since the 1950s with a ZT value as high as 1.4 in a nanocrystalline bulk specimen. 2) Compared with tellurides and selenides, little attention has been paid to the thermoelectric properties of bismuth-based sulfides because of their low ZT value. However, recent studies on sulfide systems have clearly shown that sulfides also exhibit attractive thermoelectric properties. 3) Aside from thermoelectricity, the superconductivity of layered bismuth sulfides, such as Bi4S3O4 4) and LaBiS2O1xFx 5) , has led to novel studies on superconductivity (the chemical formula is written according to standard nomenclature 6) ). The crystallographic structures of these compounds are basically composed of alternate stacks of BiS2 and oxide/fluoride layers, as shown in the inset of Fig. 1. The conduction band near the Fermi level is primarily composed of in-plane Bi 6p orbitals. The thermoelectric properties of LaBiS2O are suppressed by F substitution, 7) whereas they are improved by Se substitution. 8) Recently, EuBiS2F has been reported as a possible compound that exhibits charge-density-wave-like order below 280 K and superconductivity below 0.3 K without element substitution. 9) Specific heat measurement showed significant hybridization between Eu 4f and Bi 6p electrons, while density functional theory (DFT) calculation indicates that the valence band maximum consists of Eu 4f orbitals. 9) Given the results shown in the previous study, it was controversial from the viewpoint of thermoelectricity, whether Eu 4f and Bi 6p hybridized orbitals are effective in modulating the Fermi surface and enhancing S, 10) or reducing S owing to the coexistence of electrons and holes, i.e., mixed conduction. In this study, we demonstrate the electrical and thermal transport of EuBiS2F at temperatures between 300 and 623 K.Polycrystalline EuBiS2F was prepared by a solid-state reaction using a sealed silica tube, following the method reported by Zhai et al. 9) The relative density of the sample was calculated to be 90%. The sample purity was examined by ...

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“…The R 2 O 2 layer can be replaced by the Sr 2 F 2 or Eu 2 F 2 layer, as depicted in Figure 1c [25][26][27][28]. The SrFBiS 2 compound is a band insulator and superconductivity can be induced by electron doping as well as LaOBiS 2 .…”

Section: -Type Bis 2 -Based Superconductorsmentioning

confidence: 99%

Discovery of BiS2-Based Superconductor and Material Design Concept

Mizuguchi

2017

Condensed Matter

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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.

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New Layered Fluorosulfide SrFBiS₂

Cited by 95 publications

References 36 publications

Significant enhancement of superconductivity under Hydrostatic pressure in CeO0.5F0.5BiS2 superconductor

Significant enhancement of superconductivity under Hydrostatic pressure in CeO0.5F0.5BiS2 superconductor

Electrical and Thermal Transport of Layered Bismuth-Sulfide EuBiS₂F at Temperatures between 300 and 623 K

Discovery of BiS2-Based Superconductor and Material Design Concept

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New Layered Fluorosulfide SrFBiS2

Cited by 95 publications

References 36 publications

Significant enhancement of superconductivity under Hydrostatic pressure in CeO0.5F0.5BiS2 superconductor

Significant enhancement of superconductivity under Hydrostatic pressure in CeO0.5F0.5BiS2 superconductor

Electrical and Thermal Transport of Layered Bismuth-Sulfide EuBiS2F at Temperatures between 300 and 623 K

Discovery of BiS2-Based Superconductor and Material Design Concept

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New Layered Fluorosulfide SrFBiS₂

Electrical and Thermal Transport of Layered Bismuth-Sulfide EuBiS₂F at Temperatures between 300 and 623 K