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Liu S, Matsumoto R, Jha R, Yamashita A, Kawaguchi SI, Goto Y, Takano Y, Mizuguchi Y. High-pressure effects on superconducting properties and crystal structure of Bi-based layered superconductor La 2O 2Bi 3Ag 0.6Sn 0.4S 6. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2021; 33:225702. [PMID: 33607634 DOI: 10.1088/1361-648x/abe81b] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/16/2020] [Accepted: 02/19/2021] [Indexed: 06/12/2023]
Abstract
The effects of pressure on the superconducting properties of a Bi-based layered superconductor La2O2Bi3Ag0.6Sn0.4S6, which possesses a four-layer-type conducting layer, have been studied through the electrical resistance and magnetic susceptibility measurements. The crystal structure under pressure was examined using synchrotron x-ray diffraction at SPring-8. In the low-pressure regime, bulk superconductivity with a transition temperatureTcof ∼4.5 K was induced by pressure, which was achieved by in-plane chemical pressure effect owing to the compression of the tetragonal structure. In the high-pressure regime above 6.4 GPa, a structural symmetry lowering was observed, and superconducting transitions with aTc∼ 8 K were observed. Our results suggest the possible commonality on the factor essential forTcin Bi-based superconductors with two-layer-type and four-layer-type conducting layers.
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Affiliation(s)
- Supeng Liu
- Department of Physics, Tokyo Metropolitan University, 1-1, Minami-osawa, Hachioji, 192-0397, Japan
| | - Ryo Matsumoto
- International Center for Young Scientists (ICYS), National Institute for Materials Science (NIMS), 1-1, Sengen, Tsukuba, 305-0047, Japan
| | - Rajveer Jha
- Department of Physics, Tokyo Metropolitan University, 1-1, Minami-osawa, Hachioji, 192-0397, Japan
- International Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS), 1-1, Sengen, Tsukuba, 305-0047, Japan
| | - Aichi Yamashita
- Department of Physics, Tokyo Metropolitan University, 1-1, Minami-osawa, Hachioji, 192-0397, Japan
| | - Saori I Kawaguchi
- Japan Synchrotron Radiation Research Institute, SPring-8, 1-1-1 Kouto, Sayo, Hyogo 679-5198, Japan
| | - Yosuke Goto
- Department of Physics, Tokyo Metropolitan University, 1-1, Minami-osawa, Hachioji, 192-0397, Japan
| | - Yoshihiko Takano
- International Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS), 1-1, Sengen, Tsukuba, 305-0047, Japan
| | - Yoshikazu Mizuguchi
- Department of Physics, Tokyo Metropolitan University, 1-1, Minami-osawa, Hachioji, 192-0397, Japan
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Morino K, Goto Y, Miura A, Moriyoshi C, Kuroiwa Y, Mizuguchi Y. Crystal Structure and Thermoelectric Transport Properties of As-Doped Layered Pnictogen Oxyselenides NdO 0.8F 0.2Sb 1-xAs xSe 2. MATERIALS (BASEL, SWITZERLAND) 2020; 13:E2164. [PMID: 32392874 PMCID: PMC7254281 DOI: 10.3390/ma13092164] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/10/2020] [Revised: 04/27/2020] [Accepted: 05/04/2020] [Indexed: 11/21/2022]
Abstract
We report the synthesis and thermoelectric transport properties of As-doped layered pnictogen oxyselenides NdO0.8F0.2Sb1-xAsxSe2 (x ≤ 0.6), which are predicted to show high-performance thermoelectric properties based on first-principles calculation. The crystal structure of these compounds belongs to the tetragonal P4/nmm space group (No. 129) at room temperature. The lattice parameter c decreases with increasing x, while a remains almost unchanged among the samples. Despite isovalent substitution of As for Sb, electrical resistivity significantly rises with increasing x. Very low thermal conductivity of less than 0.8 Wm-1K-1 is observed at temperatures between 300 and 673 K for all the examined samples. For As-doped samples, the thermal conductivity further decreases above 600 K. Temperature-dependent synchrotron X-ray diffraction indicates that an anomaly also occurs in the c-axis length at around 600 K, which may relate to the thermal transport properties.
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Affiliation(s)
- Kota Morino
- Department of Physics, Tokyo Metropolitan University, 1-1 Minami-osawa, Hachioji, Tokyo 192-0397, Japan; (K.M.); (Y.M.)
| | - Yosuke Goto
- Department of Physics, Tokyo Metropolitan University, 1-1 Minami-osawa, Hachioji, Tokyo 192-0397, Japan; (K.M.); (Y.M.)
| | - Akira Miura
- Faculty of Engineering, Hokkaido University, Kita 13, Nishi 8, Sapporo 060-8628, Japan;
| | - Chikako Moriyoshi
- Department of Physical Science, Hiroshima University, 1-3-1 Kagamiyama, Higashihiroshima, Hiroshima 739-8526, Japan; (C.M.); (Y.K.)
| | - Yoshihiro Kuroiwa
- Department of Physical Science, Hiroshima University, 1-3-1 Kagamiyama, Higashihiroshima, Hiroshima 739-8526, Japan; (C.M.); (Y.K.)
| | - Yoshikazu Mizuguchi
- Department of Physics, Tokyo Metropolitan University, 1-1 Minami-osawa, Hachioji, Tokyo 192-0397, Japan; (K.M.); (Y.M.)
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Superconductivity in La2O2M4S6 -Type Bi-based Compounds: A Review on Element Substitution Effects. CONDENSED MATTER 2020. [DOI: 10.3390/condmat5020027] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Since 2012, layered compounds containing Bi-Ch (Ch: S and Se) layers have been extensively studied in the field of superconductivity. The most-studied system is BiS2-based superconductors with two-layer-type conducting layers. Recently, superconductivity was observed in La2O2M2S6 (M = metals), which contains four-layer-type conducting layers. The four-layer-type Bi-based superconductors are new systems in the family of Bi-based superconductors; we can expect further development of Bi-based layered superconductors. In this review article, we summarize the progress of synthesis, structural analysis, investigations on superconducting properties, and material design of the four-layer-type Bi-based superconductors. In-plane chemical pressure is the factor essential for the emergence of bulk superconductivity in the system. The highest Tc of 4.1 K was observed in Rare Earth elements (RE) substituted La2-xRExO2Bi3Ag0.6Sn0.4S6.
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Paris E, Mizuguchi Y, Wakita T, Terashima K, Yokoya T, Mizokawa T, Saini NL. Suppression of structural instability in LaOBiS 2-x Se x by Se substitution. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2018; 30:455703. [PMID: 30265246 DOI: 10.1088/1361-648x/aae501] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Isovalent substitution of S by Se in LaOBiS2-x Se x has a substantial effect on its electronic structure and thermoelectric properties. To investigate the possible role of BiS2 structural instability, we have studied the local structure of LaOBiS2-x Se x ([Formula: see text]) using temperature dependent Bi L3-edge extended x-ray absorption fine structure measurements. The results reveal that the local structure of the two compounds is significantly different. The BiS2 sub-lattice is largely distorted in LaOBiS2 (x = 0.0), with two in-plane Bi-S1 distances separated by ∼0.4 Å instead LaOBiSSe (x = 1.0) showing much smaller local disorder with two in-plane Bi-Se distances in the plane being separated by ∼0.2 Å. Temperature dependent study shows that the two Bi-S1 distances are characterized by different bond strength in LaOBiS2 (x = 0.0) while it is similar for the Bi-Se distances in LaOBiSSe (x = 1.0). The out of plane Bi-S2 bond is harder in LaOBiSSe indicating that the structural instability of BiS2 layer has large effect on the out-of-plane atomic correlations. The results suggest that the local structure of LaOBiS2-x Se x is an important factor to describe differing electronic and thermal transport of the two compounds.
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Affiliation(s)
- E Paris
- Dipartimento di Fisica, Università di Roma 'La Sapienza', P. le Aldo Moro 2, 00185 Roma, Italy
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Miura A, Nagao M, Goto Y, Mizuguchi Y, Matsuda TD, Aoki Y, Moriyoshi C, Kuroiwa Y, Takano Y, Watauchi S, Tanaka I, Rosero-Navarro NC, Tadanaga K. Crystal Structure and Superconductivity of Tetragonal and Monoclinic Ce 1- xPr xOBiS 2. Inorg Chem 2018; 57:5364-5370. [PMID: 29676897 DOI: 10.1021/acs.inorgchem.8b00349] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Ce1- xPr xOBiS2 powders and Ce0.5Pr0.5OBiS2 single crystals were synthesized and their structure and superconductive properties were examined by X-ray diffraction, X-ray absorption, electronic resistivity, and magnetization. While PrOBiS2 was found to be in a monoclinic phase with one-dimensional Bi-S zigzag chains showing no superconductive transition above 0.1 K, CeOBiS2 was in a tetragonal phase with two-dimensional Bi-S planes showing zero resistivity below 1.3 K. In the range x = 0.3-0.9 in Ce1- xPr xOBiS2, both monoclinic and tetragonal phases were formed together with zero resistivity up to a maximum temperature of 2.2 K. A Ce0.5Pr0.5OBiS2 single crystal, which showed both zero resistivity and a decrease in magnetization at ∼2.4 K, presented a tetragonal structure. Short Bi-S bonding in flat two-dimensional Bi-S planes and mixed Ce3+/Ce4+ were characteristic features of the Ce0.5Pr0.5OBiS2 single crystal, which presumably triggered its superconductivity.
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Affiliation(s)
- Akira Miura
- Faculty of Engineering , Hokkaido University , Kita 13, Nishi 8 , Sapporo 060-8628 , Japan
| | - Masanori Nagao
- Center for Crystal Science and Technology , University of Yamanashi , 7-32 Miyamae , Kofu 400-8511 , Japan
| | - Yosuke Goto
- Department of Physics , Tokyo Metropolitan University , 1-1 minami-osawa , Hachioji, Tokyo 192-0397 , Japan
| | - Yoshikazu Mizuguchi
- Department of Physics , Tokyo Metropolitan University , 1-1 minami-osawa , Hachioji, Tokyo 192-0397 , Japan
| | - Tatsuma D Matsuda
- Department of Physics , Tokyo Metropolitan University , 1-1 minami-osawa , Hachioji, Tokyo 192-0397 , Japan
| | - Yuji Aoki
- Department of Physics , Tokyo Metropolitan University , 1-1 minami-osawa , Hachioji, Tokyo 192-0397 , Japan
| | - Chikako Moriyoshi
- Department of Physical Science , Hiroshima University , 1-3-1 Kagamiyama , Higashihiroshima, Hiroshima 739-8526 Japan
| | - Yoshihiro Kuroiwa
- Department of Physical Science , Hiroshima University , 1-3-1 Kagamiyama , Higashihiroshima, Hiroshima 739-8526 Japan
| | - Yoshihiko Takano
- MANA , National Institute for Materials Science , 1-2-1 Sengen , Tsukuba 305-0047 , Japan
| | - Satoshi Watauchi
- Center for Crystal Science and Technology , University of Yamanashi , 7-32 Miyamae , Kofu 400-8511 , Japan
| | - Isao Tanaka
- Center for Crystal Science and Technology , University of Yamanashi , 7-32 Miyamae , Kofu 400-8511 , Japan
| | | | - Kiyoharu Tadanaga
- Faculty of Engineering , Hokkaido University , Kita 13, Nishi 8 , Sapporo 060-8628 , Japan
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Sugimoto T, Paris E, Wakita T, Terashima K, Yokoya T, Barinov A, Kajitani J, Higashinaka R, Matsuda TD, Aoki Y, Mizokawa T, Saini NL. Metallic phase in stoichiometric CeOBiS 2 revealed by space-resolved ARPES. Sci Rep 2018; 8:2011. [PMID: 29386537 PMCID: PMC5792495 DOI: 10.1038/s41598-018-20351-y] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2017] [Accepted: 01/16/2018] [Indexed: 11/29/2022] Open
Abstract
Recently CeOBiS2 system without any fluorine doping is found to show superconductivity posing question on its origin. Using space resolved ARPES we have found a metallic phase embedded in the morphological defects and at the sample edges of stoichiometric CeOBiS2. While bulk of the sample is semiconducting, the embedded metallic phase is characterized by the usual electron pocket at X point, similar to the Fermi surface of doped BiS2-based superconductors. Typical size of the observed metallic domain is larger than the superconducting correlation length of the system suggesting that the observed superconductivity in undoped CeOBiS2 might be due to this embedded metallic phase at the defects. The results also suggest a possible way to develop new systems by manipulation of the defects in these chalcogenides with structural instability.
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Affiliation(s)
- T Sugimoto
- Dipartimento di Fisica, Universitá di Roma "La Sapienza" - Piazzale Aldo Moro 2, 00185, Roma, Italy.,Department of Complexity Science and Engineering, University of Tokyo, 5-1-5 Kashiwanoha, Chiba, 277-8561, Japan.,Institute for Solid State Physics, University of Tokyo, 5-1-5 Kashiwanoha, Chiba, 277-8561, Japan
| | - E Paris
- Dipartimento di Fisica, Universitá di Roma "La Sapienza" - Piazzale Aldo Moro 2, 00185, Roma, Italy
| | - T Wakita
- Research Institute for Interdisciplinary Science (RIIS), Okayama University, Okayama, 700-8530, Japan
| | - K Terashima
- Research Institute for Interdisciplinary Science (RIIS), Okayama University, Okayama, 700-8530, Japan
| | - T Yokoya
- Research Institute for Interdisciplinary Science (RIIS), Okayama University, Okayama, 700-8530, Japan
| | - A Barinov
- Elettra, Sincrotrone Trieste, Strada Statale 14, Km 163.5, Basovizza, 34149, Trieste, Italy
| | - J Kajitani
- Department of Physics, Tokyo Metropolitan University, Hachioji, 192-0397, Japan
| | - R Higashinaka
- Department of Physics, Tokyo Metropolitan University, Hachioji, 192-0397, Japan
| | - T D Matsuda
- Department of Physics, Tokyo Metropolitan University, Hachioji, 192-0397, Japan
| | - Y Aoki
- Department of Physics, Tokyo Metropolitan University, Hachioji, 192-0397, Japan
| | - T Mizokawa
- Department of Applied Physics, Waseda University, Tokyo, 169-8555, Japan
| | - N L Saini
- Dipartimento di Fisica, Universitá di Roma "La Sapienza" - Piazzale Aldo Moro 2, 00185, Roma, Italy.
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7
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Paris E, Mizuguchi Y, Hacisalihoglu MY, Hiroi T, Joseph B, Aquilanti G, Miura O, Mizokawa T, Saini NL. Role of the local structure in superconductivity of LaO 0.5F 0.5BiS 2-x Se x system. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2017; 29:145603. [PMID: 28165329 DOI: 10.1088/1361-648x/aa5e97] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
We have studied the local structure of LaO0.5F0.5BiS2-x Se x by Bi L1-edge extended x-ray absorption fine structure (EXAFS). We find a significant effect of Se substitution on the local atomic correlations with a gradual elongation of average in-plane Bi-S bondlength. The associated mean square relative displacement, measuring average local distortions in the BiS2 plane, hardly shows any change for small Se substitution, but decreases significantly for [Formula: see text]. The Se substitution appears to suppress the local distortions within the BiS2 plane that may optimize in-plane orbital hybridization and hence the superconductivity. The results suggest that the local structure of the BiS2-layer is one of the key ingredients to control the physical properties of the BiS2-based dichalcogenides.
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Affiliation(s)
- E Paris
- Dipartimento di Fisica, Università di Roma 'La Sapienza', P. le Aldo Moro 2, 00185 Roma, Italy. Center for Life NanoScience@Sapienza, Istituto Italiano di Tecnologia, V. le Regina Elena 291, 00185 Rome, Italy
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8
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Role of valence changes and nanoscale atomic displacements in BiS 2-based superconductors. Sci Rep 2016; 6:37394. [PMID: 27874040 PMCID: PMC5118810 DOI: 10.1038/srep37394] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2016] [Accepted: 10/27/2016] [Indexed: 11/09/2022] Open
Abstract
Superconductivity within layered crystal structures has attracted sustained interest among condensed matter community, primarily due to their exotic superconducting properties. EuBiS2F is a newly discovered member in the BiS2-based superconducting family, which shows superconductivity at 0.3 K without extrinsic doping. With 50 at.% Ce substitution for Eu, superconductivity is enhanced with Tc increased up to 2.2 K. However, the mechanisms for the Tc enhancement have not yet been elucidated. In this study, the Ce-doping effect on the self-electron-doped superconductor EuBiS2F was investigated by X-ray absorption spectroscopy (XAS). We have established a relationship between Ce-doping and the Tc enhancement in terms of Eu valence changes and nanoscale atomic displacements. The new finding sheds light on the interplay among superconductivity, charge and local structure in BiS2-based superconductors.
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Morice C, Artacho E, Dutton SE, Kim HJ, Saxena SS. Electronic and magnetic properties of superconducting LnO1-x F x BiS2 (Ln = La, Ce, Pr, and Nd) from first principles. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2016; 28:345504. [PMID: 27362345 DOI: 10.1088/0953-8984/28/34/345504] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
A density functional theory study of the BiS2 superconductors containing rare-earths: LnO1-x F x BiS2 (Ln = La, Ce, Pr, and Nd) is presented. We find that CeO0.5F0.5BiS2 has competing ferromagnetic and weak antiferromagnetic tendencies, the first one corresponding to experimental results. We show that PrO0.5F0.5BiS2 has a strong tendency for magnetic order, which can be ferromagnetic or antiferromagnetic depending on subtle differences in 4f orbital occupations. We demonstrate that NdO0.5F0.5BiS2 has a stable magnetic ground state with weak tendency to order. Finally, we show that the change of rare earth does not affect the Fermi surface, and predict that CeOBiS2 should display a pressure induced phase transition to a metallic, if not superconducting, phase under pressure.
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Affiliation(s)
- Corentin Morice
- Cavendish Laboratory, University of Cambridge, Cambridge CB3 0HE, UK
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Zhai HF, Zhang P, Tang ZT, Bao JK, Jiang H, Feng CM, Xu ZA, Cao GH. Coexistence of superconductivity and complex 4 f magnetism in Eu0.5Ce0.5BiS2F. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2015; 27:385701. [PMID: 26345304 DOI: 10.1088/0953-8984/27/38/385701] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
EuBiS2F is a self-doped superconductor due to the mixed valence of Eu. Here we report that, with the Ce substitution for Eu by 50 at.%, the material exhibits ferromagnetic ordering at 8 K for the Ce-4 f moment, superconductivity at 2.2 K in the BiS2 layers and possibly antiferromagnetic ordering at 2.1 K for the Eu-4 f spins. The Eu valence is essentially divalent with the Ce incorporation. We tentatively interpret the coexistence of ferromagnetism and superconductivity by considering different Bi-6p orbitals that are responsible for the superconductivity itself and for mediating the ferromagnetic interaction, respectively. We argue that the antiferromagnetic ordering of the Eu-4 f spins is most likely due to a magnetic dipole-dipole interaction.
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Affiliation(s)
- Hui-Fei Zhai
- Department of Physics, Zhejiang University, Hangzhou 310027, People's Republic of China
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