Unusual superconducting state at 49 K in electron-doped CaFe2As2 at ambient pressure.
Bing Lv,Liangzi Deng,Melissa Gooch,Fengyan Wei,Y. Y. Sun,James K. Meen,Y.Y. Xue,Bernd Lorenz,Ching-Wu Chu +8 more
TL;DR: The detection of unusual superconductivity up to 49 K in single crystalline CaFe2As2 via electron-doping by partial replacement of Ca by rare-earth suggests the possible existence of two phases: one starting at 49 K, which has a low critical field < 4 Oe, and the other at 21 K, with a much higher critical field > 5 T.
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Abstract: We report the detection of unusual superconductivity up to 49 K in single crystalline CaFe2As2 via electron-doping by partial replacement of Ca by rare-earth. The superconducting transition observed suggests the possible existence of two phases: one starting at 49 K, which has a low critical field 5 T. Our observations are in strong contrast to previous reports of doping or pressurizing layered compounds AeFe2As2 (or Ae122), where Ae = Ca, Sr, or Ba. In Ae122, hole-doping has been previously observed to generate superconductivity with a transition temperature (Tc) only up to 38 K and pressurization has been reported to produce superconductivity with a Tc up to 30 K. The unusual 49 K phase detected will be discussed.
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Citations
Iron-based high transition temperature superconductors
TL;DR: In this paper, the dependence of transition temperature on the crystal structure, the interplay between antiferromagnetism and superconductivity by examining neutron scattering experiments, and the electronic properties of these compounds obtained by angle-resolved photoemission spectroscopy in link with some results from scanning tunneling microscopy/spectroscopy measurements.
Crystal chemistry and structural design of iron-based superconductors
TL;DR: In this article, the crystal-chemistry aspects of the known iron-based superconductors are reviewed and summarized by employing the hard and soft acids and bases (HSAB) concept.
109
Crystal Chemistry and Structural Design of Iron-Based Superconductors
TL;DR: In this paper, the crystal-chemistry aspects of the known iron-based superconductors are reviewed and summarized by employing "hard and soft acids and bases (HSAB)" concept.
Discovery of New Layered Iron Arsenide Superconductor (Ca,Pr)FeAs2
Hiroyuki Yakita,Hiraku Ogino,Tomoyuki Okada,Akiyasu Yamamoto,Kohji Kishio,Tetsuya Tohei,Yuichi Ikuhara,Yoshito Gotoh,Hiroshi Fujihisa,Kunimitsu Kataoka,Hiroshi Eisaki,Jun-ichi Shimoyama +11 more
TL;DR: In this article, a new iron-based superconductor (Ca,Pr)FeAs2 was discovered and plate-like crystals of the new phase were obtained and crystal structure was investigated by single-crystal X-ray diffraction analysis.
88
Fe-based superconducting thin films—preparation and tuning of superconducting properties
Abstract: Thin films of Fe-based superconductors (FBS) have been utilized in a plethora of different experiments for a fundamental understanding of the superconductivity in these materials, as well as for understanding and improving the materials with regard to possible applications. The developments and progress in thin film growth of these materials in the past 10 years are reviewed with a focus on the two main deposition techniques used so far for FBS (pulsed laser deposition, and molecular beam epitaxy). Possible choices of substrates or buffer systems are motivated and explained with regard to misfit, thermal expansion, chemical stability, etc. In the second part of this review, investigations on tuning the superconducting properties, especially critical temperature Tc and critical current density Jc, in FBS thin films are reviewed.
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References
Iron-Based Layered Superconductor La[O1-xFx]FeAs (x = 0.05−0.12) with Tc = 26 K
TL;DR: It is reported that a layered iron-based compound LaOFeAs undergoes superconducting transition under doping with F- ions at the O2- site and exhibits a trapezoid shape dependence on the F- content.
8.8K
Superconductivity at 38 K in the iron arsenide (Ba1-xKx)Fe2As2.
TL;DR: The ternary iron arsenide (BaFe) becomes superconducting by hole doping, which was achieved by partial substitution of the barium site with potassium as mentioned in this paper, which was the first superconductivity discovery.
3.3K
Superconductivity in the PbO-type structure α-FeSe
F. C. Hsu,J. Y. Luo,Kuo-Wei Yeh,Ta-Kun Chen,T. W. Huang,Phillip M. Wu,Yong-Chi Lee,Yi-Lin Huang,Yan-Yi Chu,Der-Chung Yan,Maw-Kuen Wu +10 more
TL;DR: The observation of superconductivity with zero-resistance transition temperature at 8 K in the PbO-type α-FeSe compound is reported, indicating that this compound has the same, perhaps simpler, planar crystal sublattice as the layered oxypnictides.
Superconductivity at 43 K in SmFeAsO1-xFx.
TL;DR: Chen et al. as discussed by the authors reported the discovery of bulk superconductivity in the related compound SmFeAsO1-xF x, which has a ZrCuSiAs-type structure.
1.8K
A superconducting copper oxide compound with electrons as the charge carriers
TL;DR: In this paper, a family of superconducting copper oxides in which the carriers are electrons was discovered, with the formula Ln2−xCexCuO4−y, where Ln stands for lanthanides Pr, Nd or Sm.
1.7K