Transport properties of the new Fe-based superconductor KxFe2Se2 (Tc=33 K)

Mizuguchi, Yoshikazu; Takeya, Hiroyuki; Kawasaki, Yuki; Ozaki, Toshinori; Tsuda, S.; Yamaguchi, Takahide; Takano, Yoshihiko

doi:10.1063/1.3549702

Cited by 152 publications

(125 citation statements)

References 15 publications

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“…After the initial report [5] and confirmation [12] of superconductivity in the nominal K x Fe 2 Se 2 , Cs and Rb compounds of the similar nominal composition [13,14] as well as Tl containing compounds of a different nominal composition (Tl,A)Fe 2−x Se 2 (A=K,Rb) [15,16] were reported to superconduct also at T C ≈ 30 K. The former composition formula indicates an intact FeSe plane as in the 11 compounds as well as "heavy electron doping" [17]. The latter suggests Fe vacancy in the FeSe plane since two different kinds of Fe vacancy orders have been reported previously in chalcogenide TlFe 2−x S 2 and TlFe 2−x P 2 [18,19].…”

Section: Sample Composition and Crystal Structure Of The Superconductorsmentioning

confidence: 99%

Structure, magnetic order and excitations in the 245 family of Fe-based superconductors

Bao

2014

J. Phys.: Condens. Matter

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Elastic neutron scattering simultaneously probes both the crystal structure and magnetic order in a material. Inelastic neutron scattering measures phonons and magnetic excitations. Here we review the average composition, crystal structure and magnetic order in the 245 family of Fe-based superconductors and in related insulating compounds from neutron diffraction works. A threedimensional phase-diagram summarizes various structural, magnetic and electronic properties as a function of the sample composition. High pressure phase diagram for the superconductor is also provided. Magnetic excitations and the theoretic Heisenberg Hamiltonian are provided for the superconductor. Issues for future works are discussed.

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Section: Sample Composition and Crystal Structure Of The Superconductorsmentioning

confidence: 99%

Structure, magnetic order and excitations in the 245 family of Fe-based superconductors

Bao

2014

J. Phys.: Condens. Matter

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“…This resulted in the discovery of several families of iron-based superconductors with the highest T c = 56 K , including REOFePn (RE = rareearth; Pn = P or As, FePn-1111 type) [1][2][3][4][5][6][7], AFe 2 As 2 (A = alkaline or alkaline-earth metal, FeAs-122 type) [8][9][10], AFeAs (FeAs-111 type) [11,12], (Sr 4 M 2 O 6 )(Fe 2 Pn 2 ) (M = Sc, Ti or V, FePn-42622 type) [13,14], FeCh (Ch = S, Se, Te, FeCh-11 type) [15][16][17] and A x Fe 2−y Se 2 (AFeCh-122 type) [18][19][20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Iron chalcogenide superconductors at high magnetic fields

Lei

Wang

et al. 2012

Science and Technology of Advanced Materials

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Iron chalcogenide superconductors have become one of the most investigated superconducting materials in recent years due to high upper critical fields, competing interactions and complex electronic and magnetic phase diagrams. The structural complexity, defects and atomic site occupancies significantly affect the normal and superconducting states in these compounds. In this work we review the vortex behavior, critical current density and high magnetic field pair-breaking mechanism in iron chalcogenide superconductors. We also point to relevant structural features and normal-state properties.

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“…The iron chalcogenides FeSe are one of the members of iron-based superconductors with the simplest structure among them. The original transition temperature T c of 8 K [4] increases above 30 -46 K by the intercalation of alkali or alkaline earth elements [5][6][7][8][9][10]; it also increases to 37 K under high pressure [11][12][13][14]. The large increase in T c is attributed to the sensitivity in its local structural difference such as the anion height from Fe atoms [15].…”

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confidence: 99%

Electrochemical Deposition of FeSe on RABiTS Tapes

et al. 2016

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FeSe film is successfully fabricated onto rolling assisted biaxially textured substrate (RABiTS) tapes by an electrochemical deposition technique. The deposited FeSe films tend to become high crystallinity with a decrease in the applied voltage to -1.0 V, and the compositional ratio of Fe to Se approaches 1:1. The sample deposited at -1.0 V shows a superconducting transition at approximately 8.0 K in the magnetic susceptibility. 3After the discovery of superconductivity in iron-based compounds [1], much attention has been paid to the development of superconducting applications under a high magnetic field [2], because of their high upper critical and irreversibility fields [3]. The iron chalcogenides FeSe are one of the members of iron-based superconductors with the simplest structure among them. The original transition temperature T c of 8 K [4] increases above 30 -46 K by the intercalation of alkali or alkaline earth elements [5][6][7][8][9][10]; it also increases to 37 K under high pressure [11][12][13][14]. The large increase in T c is attributed to the sensitivity in its local structural difference such as the anion height from Fe atoms [15]. This is related to the relatively higher T c of FeSe tapes or thin films than that of bulk FeSe because of its lattice strain [16][17][18]. These facts indicate that FeSe is a potential material for superconducting wires or tapes. It is important for industrial applications to develop simple and low-cost methods of fabricating thin films over large areas.We have been developing the deposition of FeSe by the electrochemical technique.Superconducting FeSe films were deposited onto an Fe substrate by this method [19,20]. This is the first case of the preparing tape-shaped superconducting materials by an electrochemical method. If we can change the substrate to other metals, it would lead to a wide variety of the fabrication processes.In this study, we chose the rolling assisted biaxially textured substrates (RABiTS) tape as a 4 substrate, and performed an electrochemical deposition of FeSe onto the tape. The deposited FeSe shows superconductivity at approximately 8.0 K, comparable to the T c of bulk materials. This is part of the studies to develop fabricating conditions for FeSe as a thin film by an electrochemical technique.The electrochemical depositions were performed for 30 min at a constant voltage by a three-electrode method. A platinum plate, a RABiTS tape (evico GmbH), and a Ag/AgCl electrode were used as an anode, a cathode, and a reference electrode, respectively. The RABiTS tape is composed of (001)-plane-oriented Ni formed by the recrystallization of cold-rolled pure Ni. A mixture of 0.03 mol/l FeCl 2 ·4H 2 O, 0.015 mol/l SeO 2 , and 0.1 mol/l Na 2 SO 4 was dissolved in distilled water for the preparation of the electrolyte. The pH of the electrolyte was adjusted to 2.1 by adding H 2 SO 4 . Powder X-ray diffraction (XRD) measurements were carried out using Mini Flex 600 (RIGAKU) with Cu-K radiation. The compositional ratio was analyzed by energy dispe...

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Transport properties of the new Fe-based superconductor KxFe2Se2 (Tc=33 K)

Cited by 152 publications

References 15 publications

Structure, magnetic order and excitations in the 245 family of Fe-based superconductors

Structure, magnetic order and excitations in the 245 family of Fe-based superconductors

Iron chalcogenide superconductors at high magnetic fields

Electrochemical Deposition of FeSe on RABiTS Tapes

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