Chemical Pressure Effect on Superconductivity of BiS2-Based Ce1−xNdxO1−yFyBiS2 and Nd1−zSmzO1−yFyBiS2

Kajitani, Joe; Hiroi, Takafumi; Omachi, Atsushi; Miura, Osuke; Mizuguchi, Yoshikazu

doi:10.7566/jpsj.84.044712

Cited by 35 publications

(56 citation statements)

References 25 publications

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“…T c values estimated from the magnetization measurements are represented with the larger circles in Fig. 1(a), which are in agreement with the results of a previous study [21]. Ce, and Pr, a small portion (smaller than 4%) of REF3 impurity phases was detected, and a two-phase analysis was performed.…”

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confidence: 89%

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Evolution of Anisotropic Displacement Parameters and Superconductivity with Chemical Pressure in BiS₂-Based REO_0.5F_0.5BiS₂ (RE = La, Ce, Pr, and Nd)

et al. 2018

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In order to understand the mechanisms behind the emergence of superconductivity by the chemical pressure effect in REO0.5F0.5BiS2 (RE = La, Ce, Pr, and Nd), where bulk superconductivity is induced by the substitutions with a smaller-radius RE, we performed synchrotron powder X-ray diffraction, and analyzed the crystal structure and anisotropic displacement parameters. With the decrease of the RE 3+ ionic radius, the in-plane disorder of the S1 sites significantly decreased, very similar to the trend observed in the Se-substituted systems: LaO0.5F0.5BiS2-xSex and Eu0.5La0.5FBiS2-xSex. Therefore, the emergence of bulk superconductivity upon the suppression of the in-plane disorder at the chalcogen sites is a universal scenario for the BiCh2-based superconductors. In addition, we indicated that the amplitude of vibration along the c-axis of the in-plane chalcogen sites may be related to the Tc in the BiCh2-based superconductors. . In addition, the observed temperature dependence of the electrical resistivity was not metallic-like; it showed a weakly localized behavior in LaO1-xFxBiS2, although band calculations suggested that the electron-doped LaO1-xFxBiS2 should be metal [4,5,12]. These results suggested that the doped electrons were localized by the effect of structural disorder.In order to induce bulk superconductivity in LaO1-xFxBiS2, high pressure effects can be employed.The application of an external pressure induces bulk superconductivity with a Tc of ~10 K [13][14][15]. In addition, samples annealed under a high pressure (~2 GPa) also exhibit bulk superconductivity with aTc of ~10 K [2,[16][17][18]. The emergence of bulk superconductivity and increase of Tc in the highpressure phase can be attributed to the structural phase transition from the tetragonal low-Tc phase to the monoclinic high-Tc phase [13].Another approach to induce bulk superconductivity in the LaO1-xFxBiS2 system is to introduce a chemical pressure by an isovalent substitution, such as Ch (Ch: S, Se) and/or RE site substitutions. In LaO0.5F0.5BiS2-xSex, the substitutions of Se for the S sites induces bulk superconductivity with a Tc of ~3.8 K [19,20]. Another isovalent substitution is the RE site substitution. With the decrease of the RE 3+ (mean) ionic radius in REO0.5F0.5BiS2, the BiS2 layer becomes compressed, in particular along the ab-plane direction, and bulk superconductivity is induced [21]. As the isovalent substitution does not significantly affect the carrier concentration, the structural optimization induces superconductivity in the Ch-and RE-substituted systems. In order to analyze the essential factor for the emergence of the superconductivity, we considered the commonality of the chemical pressure effects between the Ch-and RE substitutions, by introducing the concept of an in-plane chemical pressure [22].The emergence of the bulk superconductivity in the LaO0.5F0.5BiS2-xSex system was explained by the decrease in the in-plane disorder of the chalcogen sites with the increase of the Se content, which was detected thro...

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confidence: 89%

“…As reported in Ref. 21, bulk superconductivity of REO0.5F0.5BiS2 appears at an RE 3+ -radius of ~113 pm, which corresponds to RE = Pr or Ce0.5Nd0.5. Tc increases with the decrease of the RE 3+ radius.…”

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confidence: 64%

Evolution of Anisotropic Displacement Parameters and Superconductivity with Chemical Pressure in BiS₂-Based REO_0.5F_0.5BiS₂ (RE = La, Ce, Pr, and Nd)

et al. 2018

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“…Although it was reported that SmO 0.5 F 0.5 BiS 2 can be synthesized by solid state reaction, 33 this result might be helpful in explaining why this parent com- pound could not be synthesized in other studies using the same method. 27,31 As is shown in Fig. 6, ρ(T) of La 1−x Sm x O 0.5 F 0.5 BiS 2 increases with decreasing temperature at low pressures in their normal state, indicating semiconducting-like behavior, which is suppressed by applied pressure.…”

Section: Resultsmentioning

confidence: 76%

“…Although the value of T c for x = 0.8 is the highest among the four compositions at ambient pressure, dT c /dP is negative with a value of roughly -0.45 K/GPa, which results in a decreasing T c with pressure down to P t o . These results suggest that reduction of the lattice parameter a, which is regarded to be essential to the enhancement of T c for BiS 2 -based compounds at ambient pressure, 11,27,31,32 does not always result in an increase of T c .…”

Section: Resultsmentioning

confidence: 89%

Pressure-induced phase transition inLa1−xSmxO0.5F0.5BiS
Fang
¹
,
Yazici
²
,
White
³

et al. 2015
Phys. Rev. B
18
1
24
0
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Electrical resistivity measurements on La1−xSmxO0.5F0.5BiS2 (x = 0.1, 0.3, 0.6, 0.8) have been performed under applied pressures up to 2.6 GPa from 2 K to room temperature. The superconducting transition temperature Tc of each sample significantly increases at a Sm-concentration dependent pressure Pt, indicating a pressure-induced phase transition from a low-Tc to a high-Tc phase. At ambient pressure, Tc increases dramatically from 2.8 K at x = 0.1 to 5.4 K at x = 0.8; however, the Tc values at P > Pt decrease slightly with x and Pt shifts to higher pressures with Sm substitution. In the normal state, semiconducting-like behavior is suppressed and metallic conduction is induced with increasing pressure in all of the samples. These results suggest that the pressure dependence of Tc for the BiS2-based superconductors is related to the lattice parameters at ambient pressure and enable us to estimate the evolution of Tc for SmO0.5F0.5BiS2 under pressure.

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“…A few groups have been able to perform partial elementsubstitutions in the LnO block layers (Ln = La, Ce, and Nd) in LnO 1−x FxBiS 2 superconductors [47][48][49][50][51]. First, the results corresponding to samples with x = 0.5 are discussed.…”

Section: Isovalent Substitution At Block Layersmentioning

confidence: 99%

Evolution of superconductivity and magnetism in BiS2-based layered compounds

Demura¹

2016

Novel Superconducting Materials

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BiS 2 -based compounds constitute a new family of layered superconductors. In this article, several experimental findings on the superconductivity and related properties of the BiS 2 family are reviewed. In particular, the focus is on the conditions required for the emergence of superconductivity and higher superconducting transition temperature in the BiS 2 family: it is shown that optimizing the electron doping and crystal structure are important. Further, a few notable characteristics such as the coexistence of superconductivity and magnetism as well as the relation between the superconductivity and chargedensity-wave instability are introduced in brief.

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Chemical Pressure Effect on Superconductivity of BiS₂-Based Ce₁₋_xNd_xO₁₋_yF_yBiS₂ and Nd₁₋_zSm_zO₁₋_yF_yBiS₂

Cited by 35 publications

References 25 publications

Evolution of Anisotropic Displacement Parameters and Superconductivity with Chemical Pressure in BiS₂-Based REO_0.5F_0.5BiS₂ (RE = La, Ce, Pr, and Nd)

Evolution of Anisotropic Displacement Parameters and Superconductivity with Chemical Pressure in BiS₂-Based REO_0.5F_0.5BiS₂ (RE = La, Ce, Pr, and Nd)

Pressure-induced phase transition inLa1−xSmxO0.5F0.5BiS
Fang
¹
,
Yazici
²
,
White
³

et al. 2015
Phys. Rev. B
18
1
24
0
View full text Add to dashboard Cite

Evolution of superconductivity and magnetism in BiS2-based layered compounds

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Chemical Pressure Effect on Superconductivity of BiS2-Based Ce1−xNdxO1−yFyBiS2 and Nd1−zSmzO1−yFyBiS2

Cited by 35 publications

References 25 publications

Evolution of Anisotropic Displacement Parameters and Superconductivity with Chemical Pressure in BiS2-Based REO0.5F0.5BiS2 (RE = La, Ce, Pr, and Nd)

Evolution of Anisotropic Displacement Parameters and Superconductivity with Chemical Pressure in BiS2-Based REO0.5F0.5BiS2 (RE = La, Ce, Pr, and Nd)

Pressure-induced phase transition inLa1−xSmxO0.5F0.5BiSFang1, Yazici2, White3 et al. 2015Phys. Rev. B181240View full textAdd to dashboardCite

Evolution of superconductivity and magnetism in BiS2-based layered compounds

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Chemical Pressure Effect on Superconductivity of BiS₂-Based Ce₁₋_xNd_xO₁₋_yF_yBiS₂ and Nd₁₋_zSm_zO₁₋_yF_yBiS₂

Evolution of Anisotropic Displacement Parameters and Superconductivity with Chemical Pressure in BiS₂-Based REO_0.5F_0.5BiS₂ (RE = La, Ce, Pr, and Nd)

Evolution of Anisotropic Displacement Parameters and Superconductivity with Chemical Pressure in BiS₂-Based REO_0.5F_0.5BiS₂ (RE = La, Ce, Pr, and Nd)

Pressure-induced phase transition inLa1−xSmxO0.5F0.5BiS
Fang
¹
,
Yazici
²
,
White
³

et al. 2015
Phys. Rev. B
18
1
24
0
View full text Add to dashboard Cite