Appearance of bulk superconductivity under hydrostatic pressure in Sr0.5RE0.5FBiS2 (RE = Ce, Nd, Pr, and Sm) compounds

Jha, Rajveer; Tiwari, Brajesh; Awana, V. P. S.

doi:10.1063/1.4905391

Cited by 46 publications

(59 citation statements)

References 35 publications

(88 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The parent LnOBiS2 (Ln = La, Ce and Th) and SrFBiS2 compounds are semiconducting [18][19][20] . In these compounds, superconductivity is induced by doping them with suitable electron donors 6,13,16,17 .…”

Section: Introductionmentioning

confidence: 99%

“…Broadly categorising, these superconducting materials comprise the families Bi-O-S (Tc = 4.5-6 K) [1][2][3][4][5] , LnO1−xFxBiS2 (Ln = La, Ce, Pr, Nd, Sm and Yb) (Tc = 1.9-5.4 K) [6][7][8][9][10][11][12] , and Sr1−xLnxFBiS2 (Ln = La, Ce, Pr, Nd and Sm) (Tc ~ 3 K) [13][14][15][16][17] . The parent LnOBiS2 (Ln = La, Ce and Th) and SrFBiS2 compounds are semiconducting [18][19][20] .…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Unusual Mixed Valence of Eu in Two Materials—EuSr₂Bi₂S₄F₄ and Eu₂SrBi₂S₄F₄: Mössbauer and X-ray Photoemission Spectroscopy Investigations

et al. 2017

View full text Add to dashboard Cite

We have synthesized two new Eu-based compounds, EuSr2Bi2S4F4 and Eu2SrBi2S4F4 which are derivatives of Eu3Bi2S4F4, an intrinsic superconductor with Tc = 1.5 K. They belong to a tetragonal structure (SG: I4/mmm, Z = 2), similar to the parent compound Eu3Bi2S4F4. Our structural and 151 Eu Mössbauer spectroscopy studies show that in EuSr2Bi2S4F4, Eu-atoms exclusively occupy the crystallographic 2a-sites. In Eu2SrBi2S4F4, 2a-sites are fully occupied by Eu-atoms and the other half of Eu-atoms and Sr-atoms together fully occupy 4e-sites in a statistical distribution. In both compounds Eu atoms occupying the crystallographic 2a-sites are in a homogeneous mixed valent state ~ 2.6 -2.7. From our magnetization studies in an applied H  9 Tesla, we infer that the valence of Eu-atoms in Eu2SrBi2S4F4 at the 2a-sites exhibits a shift towards 2+. Our XPS studies corroborate the occurrence of valence fluctuations of Eu and after Ar-ion sputtering show evidence of enhanced population of Eu 2+ -2 states. Resistivity measurements, down to 2 K suggest a semi-metallic nature for both compounds.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Unusual Mixed Valence of Eu in Two Materials—EuSr₂Bi₂S₄F₄ and Eu₂SrBi₂S₄F₄: Mössbauer and X-ray Photoemission Spectroscopy Investigations

et al. 2017

View full text Add to dashboard Cite

show abstract

“…In this * Electronic address: zhuxiyu@nju.edu.cn, hhwen@nju.edu.cn newly found BiS 2 family, high pressure has been recognized as an important tool to enhance both the superconductivity volume and transition temperatures except for Bi 4 O 4 S 3 [22][23][24][25][26][27][28]. In particular, the SC transition temperature of REO 1−x F x BiS 2 (RE=La, Ce, Nd, Pr) [22][23][24] and Sr 1−x RE x FBiS 2 (RE = La, Ce, Nd, Pr, Sm) [25,28] systems was enhanced tremendously by applying the hydrostatic pressure. Taking LaO 0.5 F 0.5 BiS 2 as an example, the T c of the sample can be increased from about 2 K under ambient pressure to ∼ 10 K under 2 GPa [22].…”

mentioning

confidence: 99%

Pressure-tuned enhancement of superconductivity and change of ground state properties inLaO0.5F0.5BiSe2single crystals

Liu

Sheng

et al. 2014

Phys. Rev. B

View full text Add to dashboard Cite

By using a hydrostatic pressure, we have successfully tuned the ground state and superconductivity in LaO0.5F0.5BiSe2 single crystals. It is found that, with the increase of pressure, the original superconducting phase with Tc ∼ 3.5 K can be tuned to a state with lower Tc, and then a new superconducting phase with Tc ∼ 6.5 K emerges. Accompanied by this crossover, the ground state is switched from a semiconducting state to a metallic one. Accordingly, the normal state resistivity also shows a nonmonotonic change with the external pressure. Furthermore, by applying a magnetic field, the new superconducting state under pressure with Tc ∼ 6.5 K is suppressed, and the normal state reveals a weak semiconducting feature again. These results illustrate a non-trivial relationship between the normal state property and superconductivity in this newly discovered superconducting system.

show abstract

“…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

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

Appearance of bulk superconductivity under hydrostatic pressure in Sr0.5RE0.5FBiS2 (RE = Ce, Nd, Pr, and Sm) compounds

Cited by 46 publications

References 35 publications

Unusual Mixed Valence of Eu in Two Materials—EuSr₂Bi₂S₄F₄ and Eu₂SrBi₂S₄F₄: Mössbauer and X-ray Photoemission Spectroscopy Investigations

Unusual Mixed Valence of Eu in Two Materials—EuSr₂Bi₂S₄F₄ and Eu₂SrBi₂S₄F₄: Mössbauer and X-ray Photoemission Spectroscopy Investigations

Pressure-tuned enhancement of superconductivity and change of ground state properties inLaO0.5F0.5BiSe2single crystals

Discovery of BiS2-Based Superconductor and Material Design Concept

Contact Info

Product

Resources

About

Appearance of bulk superconductivity under hydrostatic pressure in Sr0.5RE0.5FBiS2 (RE = Ce, Nd, Pr, and Sm) compounds

Cited by 46 publications

References 35 publications

Unusual Mixed Valence of Eu in Two Materials—EuSr2Bi2S4F4 and Eu2SrBi2S4F4: Mössbauer and X-ray Photoemission Spectroscopy Investigations

Unusual Mixed Valence of Eu in Two Materials—EuSr2Bi2S4F4 and Eu2SrBi2S4F4: Mössbauer and X-ray Photoemission Spectroscopy Investigations

Pressure-tuned enhancement of superconductivity and change of ground state properties inLaO0.5F0.5BiSe2single crystals

Discovery of BiS2-Based Superconductor and Material Design Concept

Contact Info

Product

Resources

About

Unusual Mixed Valence of Eu in Two Materials—EuSr₂Bi₂S₄F₄ and Eu₂SrBi₂S₄F₄: Mössbauer and X-ray Photoemission Spectroscopy Investigations

Unusual Mixed Valence of Eu in Two Materials—EuSr₂Bi₂S₄F₄ and Eu₂SrBi₂S₄F₄: Mössbauer and X-ray Photoemission Spectroscopy Investigations