Superconductivity and relative phase stability in 1:2:2 ternary transition metal silicides and germanides

Shelton, R.N.; Braun, H. F.; Musick, E.

doi:10.1016/0038-1098(84)90008-5

Cited by 67 publications

(41 citation statements)

References 10 publications

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“…As shown in the inset to Fig. 2, near 2 K, the electrical resistivity of ThIr 2 Si 2 suddenly decreases down to zero, marking the onset of the superconducting state, in good agreement with the literature data [5].…”

Section: Resultssupporting

confidence: 91%

“…The suggested scenario has recently been confirmed for YIr 2 Si 2 and LaIr 2 Si 2 [6]. The related compound ThIr 2 Si 2 was reported to crystallize with the CaBe 2 Ge 2 -type unit cell only [5]. According to Ref.…”

Section: Introductionmentioning

confidence: 80%

“…Interestingly, the polymorphs usually display distinct physical behaviors, hence providing a superb playground for advanced studies on structureproperty relationships [1][2][3][4]. A remarkable observation has been made by Shelton et al [5], who concluded from his studies on an extended series of nonmagnetic RT 2 M 2 polymorphs that only those crystallizing with the CaBe 2 Ge 2 -type structure may exhibit superconductivity, while their ThCr 2 Si 2 -type counterparts always remain normal down to the lowest temperatures available. The suggested scenario has recently been confirmed for YIr 2 Si 2 and LaIr 2 Si 2 [6].…”

Section: Introductionmentioning

confidence: 99%

“…According to Ref. [5], it becomes superconducting below T c = 2.16-2.27 K, yet no physical data has been published to date. Hence, the main aim of the present work was to prove the electronic ground state in this material.…”

Section: Introductionmentioning

confidence: 99%

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Superconductivity in ThIr₂Si₂

Domieracki

Kaczorowski

2016

Acta Phys. Pol. A

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The compound ThIr2Si2 crystallizes with a tetragonal crystal structure of the CaBe2Ge2-type (space group P 4/nmm). Its low-temperature physical properties were investigated by means of magnetization, electrical resistivity, and heat capacity measurements, performed down to 0.35 K. The experiments revealed bulk superconductivity below Tc = 2 K. The obtained data indicate that ThIr2Si2 is a weakly-coupled type-II BCS superconductor.

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Section: Resultssupporting

confidence: 91%

Section: Introductionmentioning

confidence: 80%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Superconductivity in ThIr₂Si₂

Domieracki

Kaczorowski

2016

Acta Phys. Pol. A

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“…5 IrGe formula unit at the deep pseudogap inspired us to reinvestigate the electronic structure of superconductor IrGe, which has 13 valence electrons per formula unit. 22 Not surprisingly, a broad pseudogap in the DOS of IrGe is located above the Fermi level, also corresponding to 14 valence electrons.…”

Section: Resultsmentioning

confidence: 99%

Superconductivity in a new intermetallic structure type based on endohedral Ta@Ir7Ge4 clusters

et al. 2017

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We report the observation of superconductivity at a temperature near 3.5 K for the previously unreported compound TaIr 2 Ge 2 . In addition to being a superconductor, this material displays a new crystal structure type that contains endohedral clusters, as determined by single crystal Xray diffraction structure refinement; the structure is more complex than those of the commonly observed tetragonal 122 intermetallic phases. Despite the strong metal-metal interactions, electronic structure calculations show the presence of a relatively simple set of states at the Fermi level, consisting mostly of Ta atom orbital contributions. The superconducting transition is characterized by temperature-dependent resistivity, magnetic susceptibility and specific heat measurements, and is of the weak coupling BCS type with ΔC/γT c =1.55. The upper critical field at 0 K is estimated to be 2 Tesla. Basic characterization of the superconductivity suggests that this material is similar to PbTaSe 2 , for which the effects of spin-orbit coupling may be important.2

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Research and Prospects of Iron‐Based Superconductors

2009

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The discovery of a new superconductor, LaFeAsO1−xFx with a superconducting critical temperatureT,c, of 26 K in 2008, has quickly renewed interest in the exploration of iron‐based superconductors. More than 70 new superconductors have been discovered within several months, with the highest Tc of up to 55 K being observed in the SmFeAsO1−x compound. High Tcs have previously only been observed in cuprates; these new iron‐based superconductors have been added as second members of the high‐Tc family. The crystal structure of these compounds contains an almost 2D Fe–As layer formed by FeAs4 tetrahedrons, which can be separated by an oxide or metal layer that provides extra electrons to the Fe–As layer, and the itinerant iron 3d electrons form an antiferromagnetic (AFM) order state in the undoped parent compounds at around 100–200 K. Superconductivity can be induced by carrier doping, which destroys the AFM ground state. In this Review, the most recent findings on and basic experimental facts about this class of high‐Tc materials will be presented, including the various superconducting structures, the synthesis methods, the physical properties of the parent compounds, the doping methods that could produce superconductivity, pressure effects, and the prospects for this new iron‐based high‐Tc family.

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Superconductivity and relative phase stability in 1:2:2 ternary transition metal silicides and germanides

Cited by 67 publications

References 10 publications

Superconductivity in ThIr₂Si₂

Superconductivity in ThIr₂Si₂

Superconductivity in a new intermetallic structure type based on endohedral Ta@Ir7Ge4 clusters

Research and Prospects of Iron‐Based Superconductors

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Superconductivity and relative phase stability in 1:2:2 ternary transition metal silicides and germanides

Cited by 67 publications

References 10 publications

Superconductivity in ThIr2Si2

Superconductivity in ThIr2Si2

Superconductivity in a new intermetallic structure type based on endohedral Ta@Ir7Ge4 clusters

Research and Prospects of Iron‐Based Superconductors

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Product

Resources

About

Superconductivity in ThIr₂Si₂

Superconductivity in ThIr₂Si₂