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Structure and Electronic Properties of Emerging Superconductor and Related Materials
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Structure and Electronic Properties of Emerging Superconductor and Related Materials

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Quantum Materials".

Deadline for manuscript submissions: closed (10 December 2023) | Viewed by 11179

Special Issue Editor

Prof. Dr. Naurang L. Saini

E-Mail Website
Guest Editor
Department of Physics, Universita degli Studi di Roma La Sapienza, Rome, Italy
Interests: superconductors; layered functional materials; disordered systems; intrinsic local structure; electronic properties; X-ray spectroscopy; imaging of structure and electronic structure

Special Issue Information

Dear Colleagues,

Materials is planning to publish a special Focus Issue dedicated to original research papers on experimental and theoretical aspects of “Structure and electronic properties of emerging superconductors”. This is motivated by the fact that, in the real materials, the assumption of the periodic array of atoms arranged perfectly to describe the macroscopic properties does not always hold with the diverging structure, with large consequences on the electronic properties of the materials. Among others, the frontline examples are the high Tc superconductors, iron-based superconductors, dichalcogenide superconductors and other related functional materials.

We are inviting you to contribute an article to this Focus Issue on this expanding area of research on superconductors and closely related functional materials. This will mostly be an invitation-only volume; however, the editor may select a few worthy contributions from unsolicited proposals received from authors. The manuscripts accepted for publication will undergo the standard review process of the journal.

We expect this Focus Issue to be comprehensive and impactful, and we hope that you will accept our invitation.

Prof. Dr. Naurang L. Saini
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Materials is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • Structure function in superconductors
  • Emerging layered functional materials
  • Intrinsic local structure
  • Electronic properties
  • Imaging of structure and electronic structure

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Published Papers (6 papers)

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Research

11 pages, 688 KiB  
Article
Anisotropic Local Structure of SrFe2−xNixAs2 (x = 0.00, 0.16, and 0.23) Superconductor Probed by Polarized X-ray Absorption Fine Structure Measurements
by M. Y. Hacisalihoglu, L. Tortora, G. Tomassucci, L. Simonelli and N. L. Saini
Materials 2024, 17(6), 1301; https://doi.org/10.3390/ma17061301 - 11 Mar 2024
Viewed by 1052
Abstract
We have investigated the effect of the Ni substitution on the local structure and the valence electronic states of the SrFe2−xNixAs2 (x = 0.00, 0.16, and 0.23) superconductor with a multi-edge extended X-ray absorption fine structure [...] Read more.
We have investigated the effect of the Ni substitution on the local structure and the valence electronic states of the SrFe2−xNixAs2 (x = 0.00, 0.16, and 0.23) superconductor with a multi-edge extended X-ray absorption fine structure (EXAFS) and X-ray absorption near edge structure (XANES) spectroscopy. The As K-edge and Fe K-edge EXAFS measurements in the two polarizations (E‖ab and E‖c) show a clear change in the local structure with Ni concentration. The near-neighbor bondlengths and the related mean-square relative displacements (MSRDs) decrease as the Ni content increases. The polarized XANES spectra at the As, Fe and Ni K edges reveal a systematic change in the anisotropy of the valence electronic structure. The results suggest that the quasi 2D electronic structure of this system tends to become more isotropic as the Ni content increases. The local structure and the valence electronic states are discussed in the frame of the evolving electronic transport of the SrFe2−xNixAs2 system. Full article
(This article belongs to the Special Issue Structure and Electronic Properties of Emerging Superconductor and Related Materials)
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7 pages, 1007 KiB  
Communication
Ferromagnetic Fluctuations in the Heavily Overdoped Regime of Single-Layer High-Tc Cuprate Superconductors
by Tadashi Adachi, Koshi Kurashima, Takayuki Kawamata, Takashi Noji, Satoru Nakajima and Yoji Koike
Materials 2023, 16(21), 7048; https://doi.org/10.3390/ma16217048 - 6 Nov 2023
Viewed by 1209
Abstract
To investigate proposed ferromagnetic fluctuations in the so-called single-layer Bi-2201 and La-214 high-Tc cuprates, we performed magnetization and electrical resistivity measurements using single-layer Tl-2201 cuprates Tl2Ba2CuO6+δ and La-214 La2−xSrxCuO4 in [...] Read more.
To investigate proposed ferromagnetic fluctuations in the so-called single-layer Bi-2201 and La-214 high-Tc cuprates, we performed magnetization and electrical resistivity measurements using single-layer Tl-2201 cuprates Tl2Ba2CuO6+δ and La-214 La2−xSrxCuO4 in the heavily overdoped regime. Magnetization of Tl2Ba2CuO6+δ and La2−xSrxCuO4 exhibited the tendency to be saturated in high magnetic fields at low temperatures, suggesting the precursor behavior toward the formation of a ferromagnetic order. It was found that the power of temperature n obtained from the temperature dependence of the electrical resistivity is ~4/3 and ~5/3 for Bi-2201 and La2−xSrxCuO4, respectively, and is ~4/3 at high temperatures and ~5/3 at low temperatures in Tl2Ba2CuO6+δ. These results suggest that two- and three-dimensional ferromagnetic fluctuations exist in Bi-2201 and La2−xSrxCuO4, respectively. In Tl2Ba2CuO6+δ, it is suggested that the dimension of ferromagnetic fluctuations is two at high temperatures and three at low temperatures, respectively. The dimensionality of ferromagnetic fluctuations is understood in terms of the dimensionality of the crystal structure and the bonding of atoms in the blocking layer. Full article
(This article belongs to the Special Issue Structure and Electronic Properties of Emerging Superconductor and Related Materials)
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9 pages, 3692 KiB  
Article
Observation of the Specific Heat Jump in the Se-Substituted MoTe2 Single Crystals
by Aoi Kobayashi, Yoshiki Takano and Satoshi Demura
Materials 2022, 15(11), 3782; https://doi.org/10.3390/ma15113782 - 25 May 2022
Cited by 1 | Viewed by 1625
Abstract
1T’-MoTe2 has gained considerable attention owing to its topological character. This material undergoes spatial inversion symmetry at 300 K. A structural transition to the Td phase, which is represented by a kink in the resistivity, was observed below 250 K without [...] Read more.
1T’-MoTe2 has gained considerable attention owing to its topological character. This material undergoes spatial inversion symmetry at 300 K. A structural transition to the Td phase, which is represented by a kink in the resistivity, was observed below 250 K without inversion symmetry along the c-axis, while superconductivity was observed at 0.1 K. Substitution of Se into this material suppressed the appearance of the kink structure and increased the superconducting transition temperature to 2 K, which is consistent with previously reported results on polycrystalline samples. However, a specific heat jump was observed in the obtained single crystals, which did not exhibit kink structures in their resistivity. The results suggest that the Td structure was not suppressed entirely after Se substitution and that superconductivity was achieved without inversion symmetry. Full article
(This article belongs to the Special Issue Structure and Electronic Properties of Emerging Superconductor and Related Materials)
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10 pages, 1780 KiB  
Article
Investigation of Superconductivity in Ce-Doped (La,Pr)OBiS2 Single Crystals
by Masanori Nagao, Yuji Hanada, Akira Miura, Yuki Maruyama, Satoshi Watauchi, Yoshihiko Takano and Isao Tanaka
Materials 2022, 15(9), 2977; https://doi.org/10.3390/ma15092977 - 19 Apr 2022
Viewed by 1766
Abstract
Single crystals of Ce-doped (La,Pr)OBiS2 superconductors, the multinary rare-earth elements substituted ROBiS2, were successfully grown. The grown crystals typically had a size of 1–2 mm and a plate-like shape with a well-developed c-plane. The c-axis lattice constants of [...] Read more.
Single crystals of Ce-doped (La,Pr)OBiS2 superconductors, the multinary rare-earth elements substituted ROBiS2, were successfully grown. The grown crystals typically had a size of 1–2 mm and a plate-like shape with a well-developed c-plane. The c-axis lattice constants of the obtained (La,Ce,Pr)OBiS2 single crystals were approximately 13.6–13.7 Å, and the superconducting transition temperature was 1.23–2.18 K. Valence fluctuations of Ce and Pr were detected through X-ray absorption spectroscopy analysis. In contrast to (Ce,Pr)OBiS2 and (La,Ce)OBiS2, the superconducting transition temperature of (La,Ce,Pr)OBiS2 increased with the increasing concentrations of the tetravalent state at the R-site. Full article
(This article belongs to the Special Issue Structure and Electronic Properties of Emerging Superconductor and Related Materials)
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8 pages, 2098 KiB  
Article
Synthesis and Characterization of High-Entropy-Alloy-Type Layered Telluride MBi2Te4 (M = Ag, In, Sn, Pb, Bi)
by Yuki Nakahira, Seiya Shimono, Yosuke Goto, Akira Miura, Chikako Moriyoshi and Yoshikazu Mizuguchi
Materials 2022, 15(7), 2614; https://doi.org/10.3390/ma15072614 - 1 Apr 2022
Cited by 2 | Viewed by 2407
Abstract
Recently, high-entropy alloys (HEAs) and HEA-type compounds have been extensively studied in the fields of material science and engineering. In this article, we report on the synthesis of a layered system MBi2Te4 where the M site possesses low-, middle-, [...] Read more.
Recently, high-entropy alloys (HEAs) and HEA-type compounds have been extensively studied in the fields of material science and engineering. In this article, we report on the synthesis of a layered system MBi2Te4 where the M site possesses low-, middle-, and high-entropy states. The samples with M = Pb, Ag1/3Pb1/3Bi1/3, and Ag1/5In1/5Sn1/5Pb1/5Bi1/5 were newly synthesized and the crystal structure was examined by synchrotron X-ray diffraction and Rietveld refinement. We found that the M-Te2 distance was systematically compressed with decreasing lattice constants, where the configurational entropy of mixing at the M site is also systematically increased. The details of structural refinements and the electrical transport property are presented. Full article
(This article belongs to the Special Issue Structure and Electronic Properties of Emerging Superconductor and Related Materials)
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9 pages, 4130 KiB  
Article
Band Structure of Organic-Ion-Intercalated (EMIM)xFeSe Superconductor
by Lyudmila V. Begunovich and Maxim M. Korshunov
Materials 2022, 15(5), 1856; https://doi.org/10.3390/ma15051856 - 2 Mar 2022
Cited by 1 | Viewed by 2016
Abstract
The band structure and the Fermi surface of the recently discovered superconductor (EMIM)xFeSe are studied within the density functional theory in the generalized gradient approximation. We show that the bands near the Fermi level are formed primarily by Fe-d orbitals. [...] Read more.
The band structure and the Fermi surface of the recently discovered superconductor (EMIM)xFeSe are studied within the density functional theory in the generalized gradient approximation. We show that the bands near the Fermi level are formed primarily by Fe-d orbitals. Although there is no direct contribution of EMIM orbitals to the near-Fermi level states, the presence of organic cations leads to a shift of the chemical potential. It results in the appearance of small electron pockets in the quasi-two-dimensional Fermi surface of (EMIM)xFeSe. Full article
(This article belongs to the Special Issue Structure and Electronic Properties of Emerging Superconductor and Related Materials)
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