BiOCuS: A new superconducting compound with oxypnictide-related structure

Ubaldini, Alberto; Giannini, E.; Senatore, Carmine; Marel, D. van der

doi:10.1016/j.physc.2009.11.164

Cited by 26 publications

(35 citation statements)

References 8 publications

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“…Very recently, a new four-component phase BiOCuS has been successfully synthesized [5]. This phase was considered as an As-free analogue for the above "1111" FeAs SCs; and Cu-or oxygen non-stoichiometry for BiOCuS leads to the occurrence of superconductivity below T C ~ 5.8 K in this material.…”

Section: Introductionmentioning

confidence: 99%

Electronic band structure and inter-atomic bonding in tetragonal BiOCuS as a parent phase for novel layered superconductors

Shein

Ivanovskiĭ

2010

Solid State Communications

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A B S T R A C TVery recently, the tetragonal BiOCuS was synthesized and declared as a new superconducting system with Fe-oxypnictide -related structure. Here, based on first-principle FLAPW-GGA calculations, the structural parameters, electronic bands picture, density of states and electron density distribution for BiOCuS are investigated for the first time. Our results show that, as distinct from related metallic-like FeAs systems, BiOCuS phase behaves as an ionic semiconductor with the calculated indirect band gap at about 0.48 eV. The superconductivity for BiOCuS may be achieved exclusively by doping of this phase. Our preliminary results demonstrate that as a result of hole doping, the [CuS] blocks become conducting owing to mixed Cu 3d + S 3p bands located near the Fermi level. For the hole doped BiOCuS the Fermi surface adopts a quasi-two-dimensional character, similarly to FeAs SCs.

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Section: Introductionmentioning

confidence: 99%

Electronic band structure and inter-atomic bonding in tetragonal BiOCuS as a parent phase for novel layered superconductors

Shein

Ivanovskiĭ

2010

Solid State Communications

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“…Although Reference [6] reported superconductivity, the shielding volume fraction of the sample was not high, indicating that the superconductivity was not bulk in nature. In addition, the other research group also examined the BiOCu 1−x S and its Pb-doped samples [7]; superconductivity, however, was not discovered in those samples.…”

Section: Discovery Of the Bi-o-s Superconductormentioning

confidence: 85%

“…In the beginning, we explored new superconductors near the BiOCuS system because a superconductivity signal was detected for Cu-deficient BiOCu 1−x S [6]. Although Reference [6] reported superconductivity, the shielding volume fraction of the sample was not high, indicating that the superconductivity was not bulk in nature.…”

Section: Discovery Of the Bi-o-s Superconductormentioning

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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confidence: 99%

“…This tetragonal P4/nmm atomic arrangement observed for the present compound can be viewed as consisting of BiO and CuS layers (the crystallographic a-b plane) alternately stacked along the c-axis crystallographic direction, as the one has been proposed. 13,14) In this compound the individual BiO layers and CuS layers are connected by mixed ionic-covalent bonds, while the BiO and CuS layers are interconnected by ionic bondings. 15) …”

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confidence: 99%

Interplay between the Crystalline and Magnetic Structures in BiOCu_0.94S

Karna

Sankar

et al. 2011

J. Phys. Soc. Jpn.

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We report on the results of neutron diffraction studies made on a slightly Cu-deficient BiOCu 0.94 S sample. The sample BiOCu 0.94 S crystallizes into a tetragonal P4/nmm symmetry with cell parameters of a=b=3.8591 Å and c=8.5540 Å at 250 K. The magnetic order parameter measurements reveal an inflection point at 250 K, signaling the ferromagetic ordering of the Cu spins. An antiferromagnetic component develops below 180 K, when the crystalline unit cell experiences a sharp thermal contraction upon cooling. This results in a canted ferromagnetic spin arrangement at low temperatures, with a saturated moment of < Z >=0.61(2) B at 3.7K.KEYWORDS: oxysulphide, neutron diffraction, magnetic structureThe strong interplay between the lattice, charge and spin has generated a great variety of intriguing properties in manganese containing compounds with a perovskite structure. [1][2][3][4][5][6] Concurrent transitions from a paramagnetic tetragonal phase to an antiferromagnetic orthorhombic phase have been observed in AFe 2 As 2 , where A is Ba or Sr or Ca. [7][8][9] On the other hand, the antiferromagnetic ordering of the Fe ions and the tetragonal-to-orthorhombic structural transition observed in RFeAsO, where R is La or Nd or Sm or Pr, can be suppressed by F-doping onto the O sites. Interestingly, the kink observed 10) in the resistivity of LaFeAsO has been identified to be associated with the lowering of the crystalline symmetry and the antiferromagnetic ordering of the Fe ions. It has also been shown 11) that CeFeAsO undergoes a lattice distortion from a tetragonal to an orthorhombic structure near 155 K, followed by the formation of an antiferromagnetic ordering on the Fe ions below 140 K. In these iron-based superconducting systems, it is the structural phase transitions that accompany the onset of magnetic ordering. Here, we present the results of investigations made using neutron diffraction measurements on a polycrystalline BiOCu 0.94 S sample. We focus on the interplay between the crystalline and magnetic structures. A change in the magnetic structure appeared when the crystalline experience a sharp thermal contraction upon cooling to below 180 K. No superconductivity is found from the resistivity and magnetization measurements upon cooling to 1.8 K.A polycrystalline sample with a nominal composition of BiOCuS was synthesized by the conventional solid-state reaction technique. The stoichiometric precursor and well mixed powders of Bi, Bi 2 S 3 , and CuO were pelletized and sealed in an evacuated quartz tube with an atmospheric pressure of 10 3 torr. The sealed quartz tubes containing the pellets were heated at 550°C for 15 hours. This was followed by furnace-cooling to room temperature at a rate of 150 °C/h. The resultant compounds were in dark black and very brittle. X-ray diffraction was first used to check the sample, pellet by pellet. No obvious differences were found in the x-ray diffraction patterns taken from different portions of the sample. The sample thus obtained was characterized by neutron diffractio...

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BiOCuS: A new superconducting compound with oxypnictide-related structure

Cited by 26 publications

References 8 publications

Electronic band structure and inter-atomic bonding in tetragonal BiOCuS as a parent phase for novel layered superconductors

Electronic band structure and inter-atomic bonding in tetragonal BiOCuS as a parent phase for novel layered superconductors

Discovery of BiS2-Based Superconductor and Material Design Concept

Interplay between the Crystalline and Magnetic Structures in BiOCu_0.94S

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BiOCuS: A new superconducting compound with oxypnictide-related structure

Cited by 26 publications

References 8 publications

Electronic band structure and inter-atomic bonding in tetragonal BiOCuS as a parent phase for novel layered superconductors

Electronic band structure and inter-atomic bonding in tetragonal BiOCuS as a parent phase for novel layered superconductors

Discovery of BiS2-Based Superconductor and Material Design Concept

Interplay between the Crystalline and Magnetic Structures in BiOCu0.94S

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Interplay between the Crystalline and Magnetic Structures in BiOCu_0.94S