Pressure-Induced Enhancement of Superconductivity and Structural Transition in BiS2-Layered LaO1−xFxBiS2

Tomita, Takahiro; Ebata, Masaya; Soeda, Hideo; Takahashi, Hiroki; Fujihisa, Hiroshi; Gotoh, Yoshito; Mizuguchi, Yoshikazu; Izawa, Hiroki; Miura, Osuke; Demura, Satoshi; Deguchi, K.; Takano, Yoshihiko

doi:10.7566/jpsj.83.063704

Cited by 132 publications

(208 citation statements)

References 23 publications

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“…In the LaO 0.5 F 0.5 BiS 2 system, it was suggested that the increase in T c is observed when the crystal structure changed from tetragonal to monoclinic under high pressure. 13) If the crystal structure of the HP sample is monoclinic, we should observe the split of both the (200) and (004) peaks of the tetragonal As-grown sample. As shown in Fig.…”

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confidence: 99%

Enhancement of T_c by Uniaxial Lattice Contraction in BiS₂-Based Superconductor PrO_0.5F_0.5BiS₂

et al. 2014

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confidence: 99%

Enhancement of T_c by Uniaxial Lattice Contraction in BiS₂-Based Superconductor PrO_0.5F_0.5BiS₂

et al. 2014

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“…Application of external hydrostatic pressure [21][22][23][24][25] results in further enhancement of Tc. The two Eu-based BiS2 superconductors EuFBiS2 (Eu-1112) (Tc = 0.3 K) 26 and Eu3Bi2S4F4 (Eu-3244) (Tc = 1.5 K) 27 are different from other BiS2-superconductors in that they are intrinsic superconductors, namely, no external doping is required to induce superconductivity.…”

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

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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.

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“…In LaOBiS 2, electron carriers can be generated by a partial substitution of O 2-by F -. 2,9) Electrical resistivity and magnetic susceptibility measurements under high pressure revealed that the transition temperature (T c ) of the BiS 2 -based family was sensitive to application of external pressure and can be significantly increased [11][12][13] as observed in the Fe-based superconductor family. [14][15][16][17] In addition, superconducting properties of the BiS 2 -based superconductors strongly depend on the sample preparation method.…”

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confidence: 99%

Increase in T c and Change of Crystal Structure by High-Pressure Annealing in BiS2-Based Superconductor CeO0.3 F 0.7BiS2

Kajitani

Hiroi

Omachi

et al. 2014

J Supercond Nov Magn

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Recently, several types of BiS 2 -based superconductor such as Bi 4 O 4 S 3 , REO 1-x F x BiS 2 (RE: rare earth) and Sr 1-x La x FBiS 2 have been discovered. In this study, we have investigated the crystal structure and the superconducting properties for two kinds of polycrystalline samples (As-grown and high-pressure-annealed samples) of the BiS 2 -based superconductor CeO 0.3 F 0.7 BiS 2 . We found that both the As-grown and the high-pressure-annealed CeO 0.3 F 0.7 BiS 2 samples show bulk superconductivity. A higher T c was observed in the high-pressure-annealed sample.The T c of CeO 0.3 F 0.7 BiS 2 increased from T c zero = 2.7 K to T c zero = 3.7 K by high-pressure annealing. The lattice constant of a and c axis did not show remarkable differences between the As-grown and the high-pressure-annealed samples. Nevertheless, the peak symmetry of the (200) peak seemed to become more symmetric while the (004) peak did not show such a difference, indicating that the crystal structure within the ab plane changed to a higher-symmetric phase, a perfect tetragonal, by high-pressure annealing in CeO 0.3 F 0.7 BiS 2 .2

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Pressure-Induced Enhancement of Superconductivity and Structural Transition in BiS₂-Layered LaO₁₋_xF_xBiS₂

Cited by 132 publications

References 23 publications

Enhancement of T_c by Uniaxial Lattice Contraction in BiS₂-Based Superconductor PrO_0.5F_0.5BiS₂

Enhancement of T_c by Uniaxial Lattice Contraction in BiS₂-Based Superconductor PrO_0.5F_0.5BiS₂

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

Increase in T c and Change of Crystal Structure by High-Pressure Annealing in BiS2-Based Superconductor CeO0.3 F 0.7BiS2

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Pressure-Induced Enhancement of Superconductivity and Structural Transition in BiS2-Layered LaO1−xFxBiS2

Cited by 132 publications

References 23 publications

Enhancement of Tc by Uniaxial Lattice Contraction in BiS2-Based Superconductor PrO0.5F0.5BiS2

Enhancement of Tc by Uniaxial Lattice Contraction in BiS2-Based Superconductor PrO0.5F0.5BiS2

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

Increase in T c and Change of Crystal Structure by High-Pressure Annealing in BiS2-Based Superconductor CeO0.3 F 0.7BiS2

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Pressure-Induced Enhancement of Superconductivity and Structural Transition in BiS₂-Layered LaO₁₋_xF_xBiS₂

Enhancement of T_c by Uniaxial Lattice Contraction in BiS₂-Based Superconductor PrO_0.5F_0.5BiS₂

Enhancement of T_c by Uniaxial Lattice Contraction in BiS₂-Based Superconductor PrO_0.5F_0.5BiS₂

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