Growth and characterization of R(O,F)BiS2 (R = La, Ce, Pr, Nd) superconducting single crystals

Nagao, Masanori

doi:10.1515/nsm-2015-0007

Cited by 23 publications

(26 citation statements)

References 41 publications

(66 reference statements)

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“…NdO 0.7 F 0.3 Bi 1−x Sb x S 2 (x = 0.01-0.08) single crystals were synthesized using a CsCl/KCl flux method in an evacuated quartz tubes [18,19]. Powders of Nd 2 S 3 , Bi 2 O 3 , Bi 2 S 3 , Sb 2 S 3 , and BiF 3 with Bi grains were used as a starting material.…”

Section: Methodsmentioning

confidence: 99%

Single Crystal Growth and Superconducting Properties of Antimony-Substituted NdO0.7F0.3BiS2

et al. 2017

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Antimony (Sb) substitution of less than 8% was examined on a single crystal of a layered superconductor NdO 0.7 F 0.3 BiS 2 . The superconducting transition temperature of the substituted samples decreased as Sb concentration increased. A lattice constant along the c-axis showed a large decrease compared with that along the a-axis. Since in-plane chemical pressure monotonically decreased as Sb concentration increased, the suppression of the superconductivity is attributed to the decrease in the in-plane chemical pressure.

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Section: Methodsmentioning

confidence: 99%

Single Crystal Growth and Superconducting Properties of Antimony-Substituted NdO0.7F0.3BiS2

et al. 2017

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“…Since the heat-treatment temperature for the growth of F-free single crystals is higher than that of R n (O,F)BiS 2 , thus, the quartz tube corrosion from KCl is enhanced at high temperature. Review of R n (O,F)BiS 2 superconducting single crystals is available [59]. With another flux, a eutectic composition of KCl:LiCl = 3:2 (molar ratio) can use the flux for R n (O,F)BiS 2 single crystals.…”

Section: Fe-based Superconductorsmentioning

confidence: 99%

Crystal Growth Techniques for Layered Superconductors

Nagao

2017

Condensed Matter

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Layered superconductors are attractive because some of them show high critical temperatures. While their crystal structures are similar, these compounds are composed of many elements. Compounds with many elements tend to be incongruent melting compounds, thus, their single crystals cannot be grown via the melt-solidification process. Hence, these single crystals have to be grown below the decomposition temperature, and then the flux method, a very powerful tool for the growth of these single crystals with incongruent melting compounds, is used. This review shows the flux method for single-crystal growth technique by self-flux, chloride-based flux, and HPHT (high-pressure and high-temperature) flux method for many-layered superconductors: high-T c cuprate, Fe-based and BiS 2 -based compounds.

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“…Since the heat-treatment temperature for the growth of F-free single crystals is higher than that of Rn(O,F)BiS2, thus, the quartz tube corrosion from KCl is enhanced at high temperature. Review of Rn(O,F)BiS2 superconducting single crystals is available [59]. With another flux, a eutectic composition of KCl:LiCl = 3:2 (molar ratio) can use the flux for Rn(O,F)BiS2 single crystals.…”

Section: Bis2-based Superconductorsmentioning

confidence: 99%

Crystal Growth Techniques for Layered Superconductors

Nagao¹

2017

Preprint

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Layered superconductors are attractive because some of them show high critical temperatures. While their crystal structures are similar, those compounds are composed of many elements. Compounds with many elements tend to be incongruent melting compounds, thus, their single crystals cannot be grown via the melt-solidification process. Hence, these single crystals have to be grown below the decomposition temperature, and then the flux method, a very powerful tool for the growth of these single crystals with incongruent melting compounds, is used. This review shows the flux method for single-crystal growth technique by self-flux, chloride-based flux, and HPHT (high-pressure and high-temperature) flux method for many-layered superconductors: high-Tc cuprate, Fe-based and BiS2-based compounds.Keywords: single crystal growth; incongruent melting compound; flux method Crystal Growth of Layered SuperconductorsThis review presents the single-crystal growth of high-Tc cuprate, Fe-based and BiS2-based superconductors as typical layered superconductors. Those layered superconductors form many analogous compounds and show other interesting properties. Additionally, layered superconductors have high anisotropy. In order to reveal such intrinsic properties, their single crystals are necessary. However, layered superconductors are composed of multiple elements and they are incongruent melting compounds. This suggests that the growth of single crystals cannot use the melt-solidification process and, thus, the solution-growth process is necessary. During the single-crystal growth process, the temperature must be lower than the decomposition temperature of the layered superconductors. Hence, the flux method is useful for single-crystal growth of layered superconductors. In this review, the single-crystal growth technique for high-Tc cuprate, Fe-based and BiS2-based compounds using various fluxes are introduced. Single-Crystal Growth Techniques for Incongruent Melting CompoundsIn order to grow single crystals, their raw materials of layered superconductors have to become solution (liquid phase) below the decomposition temperatures of the products. The solvent of that solution (liquid phase) is called "flux". Flux plays a role as a solvent in the solution-growth process. Therefore, flux should be composed of low-melting compounds, such as metals, alkali chlorides, and other compounds with a eutectic composition. The conventional flux method, the traveling solvent floating-zone (TSFZ) method, the top-seeded solution growth (TSSG) method, and the high-pressure and high-temperature (HPHT) flux method are briefly explained in this chapter. The conventional flux method does not have to use a special apparatus, but obtained crystals are small. On the other hand, TSFZ and TSSG methods use special apparatuses which are expensive. However, these methods can grow large-sized crystals, and the HPHT flux method is necessary for single-crystal growth under high pressure.

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Growth and characterization of R(O,F)BiS2 (R = La, Ce, Pr, Nd) superconducting single crystals

Cited by 23 publications

References 41 publications

Single Crystal Growth and Superconducting Properties of Antimony-Substituted NdO0.7F0.3BiS2

Single Crystal Growth and Superconducting Properties of Antimony-Substituted NdO0.7F0.3BiS2

Crystal Growth Techniques for Layered Superconductors

Crystal Growth Techniques for Layered Superconductors

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