Review of superconductivity in BiS 2 -based layered materials

Mizuguchi, Yoshikazu

doi:10.1016/j.jpcs.2014.09.003

Cited by 101 publications

(98 citation statements)

References 67 publications

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“…From magnetization measurements using a superconducting quantum interference device (SQUID) magnetometer for La2O2Bi3AgS6, we confirmed the absence of a superconducting transition down to 2 K. In addition, from the resistivity measurements down to 3.8 K, we did not observe any onset of a superconducting transition. We expect that La2O2Bi3AgS6 will become a superconductor upon carrier doping or structural optimization, as observed for other BiS2-based superconductors [38].…”

Section: Resultsmentioning

confidence: 69%

Synthesis, Crystal Structure, and Physical Properties of New Layered Oxychalcogenide La₂O₂Bi₃AgS₆

et al. 2017

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We have synthesized a new layered oxychalcogenide La2O2Bi3AgS6. From synchrotron X-ray diffraction and Rietveld refinement, the crystal structure of La2O2Bi3AgS6 was refined using a model of the P4/nmm space group with a = 4.0644(1) Å and c = 19.412(1) Å, which is similar to the related compound LaOBiPbS3, while the interlayer bonds (M2-S1 bonds) are apparently shorter in La2O2Bi3AgS6. The tunneling electron microscopy (TEM) image confirmed the lattice constant derived from Rietveld refinement (c ~ 20 Å). The electrical resistivity and Seebeck coefficient suggested that the electronic states of La2O2Bi3AgS6 are more metallic than those of LaOBiS2 and LaOBiPbS3. The insertion of a rock-salt-type chalcogenide into the van der Waals gap of BiS2-based layered compounds, such as LaOBiS2, will be a useful strategy for designing new layered functional materials in the layered chalcogenide family.

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Section: Resultsmentioning

confidence: 69%

Synthesis, Crystal Structure, and Physical Properties of New Layered Oxychalcogenide La₂O₂Bi₃AgS₆

et al. 2017

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“…Superconductivity is easily destroyed when a magnetic field, H, is applied parallel to the c-axis while superconductivity survives when H is applied parallel to the abplane which gives rise to a large magnetic anisotropy γ=H ab c2 /H c c2 ∼30-40, comparable to that of another class of Bi-based superconductors, the Bi-based cuprates. [9,12,13] H c2 is the upper critical field. The superconducting gap, ∆ s , to T c ratio yields a value of 2∆ s /k B T c =16.8 [13] which is much larger than the theoretical value of 3.5 in the weak coupling limit of the Bardeen-Cooper-Schrieffer (BCS) model of type I superconductivity.…”

Section: (A)mentioning

confidence: 99%

“…[9,10] NdO 1−x F x BiS 2 , the system of interest in this study exhibits a maximum T c of ∼5.5 K at x ∼0.4. It is the highest transition temperature of a BiS 2 superconductor under ambient pressure synthesis conditions.…”

Section: Introductionmentioning

confidence: 99%

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Charge Fluctuations in the NdO₁₋_xF_xBiS₂ Superconductors

et al. 2017

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The local atomic structure of superconducting NdO 1−x F x BiS 2 (x =0.2 and 0.4) is investigated using neutron diffraction and the pair density function analysis technique. In the nonsuperconducting x=0.2 composition, ferrodistortive displacements of the pyramidal sulfur ions break the tetragonal symmetry and a superlattice structure emerges with peaks appearing at h + k odd reflections superimposed on the even reflections of the P 4/nmm symmetry. In the superconducting x=0.4 composition, similar ferrodistortive displacements are observed but with different magnitudes coupled with in-plane Bi distortions. The distortions are indicative of charge fluctuations that may lead to charge localization and suppression of superconductivity.

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“…In addition, x (F concentration) dependence of the transition temperature (Tc) for x = 0.2-0.5 with a tetragonal structure shows an anomalously flat phase diagram. With these experimental facts, we have proposed the intrinsic phase diagram of the ideal BiCh2-based superconductors with less in-plane disorder.Since the discovery of Bi4O4S3 and REO1-xFxBiS2 (RE: rare earth) superconductors, BiCh2-based (Ch: chalcogen) superconductors have been drawing much attention as a new class of layered superconductors [1][2][3]. Since the crystal structure composed of alternate stacks of the electrically conducting BiCh2 layers and the insulating (blocking) layers resembles those of the Cuprate and the FeAs-based high-transition-temperature (high-Tc) superconductors [4,5], many experimental and theoretical studies have been performed to clarify the superconductivity mechanisms of this system and to increase Tc.…”

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Intrinsic Phase Diagram of Superconductivity in the BiCh₂-Based System Without In-Plane Disorder

et al. 2017

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We have investigated the crystal structure and physical properties of LaO1-xFxBiSSe to reveal the intrinsic superconductivity phase diagram of the BiCh2-based layered compound family. From synchrotron X-ray diffraction and Rietveld refinements with anisotropic displacement parameters, we clearly found that the in-plane disorder in the BiSSe layer was fully suppressed for all x. In LaO1-xFxBiSSe, metallic conductivity and superconductivity are suddenly induced by electron doping even at x = 0.05 and 0.1 with a monoclinic structure. In addition, x (F concentration) dependence of the transition temperature (Tc) for x = 0.2-0.5 with a tetragonal structure shows an anomalously flat phase diagram. With these experimental facts, we have proposed the intrinsic phase diagram of the ideal BiCh2-based superconductors with less in-plane disorder.Since the discovery of Bi4O4S3 and REO1-xFxBiS2 (RE: rare earth) superconductors, BiCh2-based (Ch: chalcogen) superconductors have been drawing much attention as a new class of layered superconductors [1][2][3]. Since the crystal structure composed of alternate stacks of the electrically conducting BiCh2 layers and the insulating (blocking) layers resembles those of the Cuprate and the FeAs-based high-transition-temperature (high-Tc) superconductors [4,5], many experimental and theoretical studies have been performed to clarify the superconductivity mechanisms of this system and to increase Tc. However, the mechanisms have not been understood completely. Recently, Morice et al. proposed that a 2 weak-coupling electron-phonon mechanism cannot explain the emerging Tc, as high as 11 K, in the BiCh2-based systems, from first principle calculations [6]. Therefore, full understandings of the basic characteristics of the superconductivity in the BiCh2-based system are crucial.The parent phase of the BiCh2-based superconductor is a band insulator [1,7,8]. On the basis of the calculated band structure, electrons carriers are doped into the bands mainly composed of Bi-6px and Bi-6py components. Electron-doped BiCh2-based compounds are expected to become metallic. Indeed, superconductivity is experimentally observed in electron-doped compounds [1][2][3]. However, the real situations are not simple as expected from the band structure. Although the superconductivity in BiCh2-based compounds is emerged by carrier doping, metallic transport is sometimes absent, and weakly localized behavior (semiconducting-like behavior) is observed in electrical resistivity measurements; a good example would be optimally doped LaO0.5F0.5BiS2. In semiconducting-like samples of LaO0.5F0.5BiS2, bulk superconductivity is not observed, while weak (filamentary) superconductivity is observed. To induce bulk superconductivity in the LaO0.5F0.5BiS2 system, external pressure effects [9][10][11][12][13][14][15][16] and/or element substitution at the La site [17][18][19][20], which optimize the crystal structure, are available. Namely, both electron carrier doping and crystal structure optimization are required for the e...

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Review of superconductivity in BiS 2 -based layered materials

Cited by 101 publications

References 67 publications

Synthesis, Crystal Structure, and Physical Properties of New Layered Oxychalcogenide La₂O₂Bi₃AgS₆

Synthesis, Crystal Structure, and Physical Properties of New Layered Oxychalcogenide La₂O₂Bi₃AgS₆

Charge Fluctuations in the NdO₁₋_xF_xBiS₂ Superconductors

Intrinsic Phase Diagram of Superconductivity in the BiCh₂-Based System Without In-Plane Disorder

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Review of superconductivity in BiS 2 -based layered materials

Cited by 101 publications

References 67 publications

Synthesis, Crystal Structure, and Physical Properties of New Layered Oxychalcogenide La2O2Bi3AgS6

Synthesis, Crystal Structure, and Physical Properties of New Layered Oxychalcogenide La2O2Bi3AgS6

Charge Fluctuations in the NdO1−xFxBiS2 Superconductors

Intrinsic Phase Diagram of Superconductivity in the BiCh2-Based System Without In-Plane Disorder

Contact Info

Product

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Synthesis, Crystal Structure, and Physical Properties of New Layered Oxychalcogenide La₂O₂Bi₃AgS₆

Synthesis, Crystal Structure, and Physical Properties of New Layered Oxychalcogenide La₂O₂Bi₃AgS₆

Charge Fluctuations in the NdO₁₋_xF_xBiS₂ Superconductors

Intrinsic Phase Diagram of Superconductivity in the BiCh₂-Based System Without In-Plane Disorder