The occurrence of superconductivity in sulfides, selenides, tellurides of Pt-group metals

Raub, Ch.J.; Compton, V.B.; Geballe, T. H.; Matthias, B. T.; Maita, J. P.; Hull, G. W.

doi:10.1016/0022-3697(65)90244-1

Cited by 71 publications

(22 citation statements)

References 20 publications

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“…Several Ir-based superconductors have been reported till date, which include MIr 2 As 2 (M=Sr, Ba, Y, La) [6][7][8][9], Ir 1−x Pt x Te 2 [10][11][12], SrIr 2 [13], B 2 IrT 2 (T=Mo, V) [14], ThIr, MIr 2 (M=Sc, Y, La), MIr 3 (M=La, Th, Ce), MIr 5 (M=La, Th, Ce), Y 3 Ir 2 [15], IrGe [16], M 5 Ir 4 Si 10 (M=Sc, Y, Lu), M 5 Ir 4 Ge 10 (M=Y, Lu) [17][18][19][20], IrTe 3 [21], MIr 2 Si 2 (M=Y, La) [22], and Li 2 IrSi 3 [23,24]. Among these superconductors, Sc 5 Ir 4 Si 10 has the highest T c of ∼8.5 K, which is ascribed to the large density of states (DOS) at the Fermi level (E F ) with moderate electron-phonon coupling [25].…”

Section: Introductionmentioning

confidence: 99%

Superconductivity in a new layered triangular-lattice system Li₂IrSi₂

et al. 2019

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We report on the crystal structure and superconducting properties of a novel iridium-silicide, namely Li 2 IrSi 2 . It has a Ag 2 NiO 2 -type structure (space group R-3m) with the lattice parameters a=4.028 30 (6) Å and c=13.161 80(15) Å. The crystal structure comprises IrSi 2 and double Li layers stacked alternately along the c-axis. The IrSi 2 layer includes a two-dimensional Ir equilateral-triangular lattice. Electrical resistivity and static magnetic measurements revealed that Li 2 IrSi 2 is a type-II superconductor with critical temperature (T c ) of 3.3 K. We estimated the following superconducting parameters: lower critical field H c1 (0)∼42 Oe, upper critical field H c2 (0)∼1.7 kOe, penetration depth λ 0 ∼265 nm, coherence length ξ 0 ∼44 nm, and Ginzburg-Landau parameter κ GL ∼6.02. The specific-heat data suggested that superconductivity in Li 2 IrSi 2 could be attributed to weakcoupling Cooper pairs.

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Section: Introductionmentioning

confidence: 99%

Superconductivity in a new layered triangular-lattice system Li₂IrSi₂

et al. 2019

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“…PdTe 2 has been known to be a superconductor for almost six decades. [1][2][3][4] But, due to a very low critical temperature (∼ 1.7 K), the details of the superconducting phase of PdTe 2 did not receive much attention. The superconducting properties of PdTe 2 attracted renewed attention of the community following recent discovery of complex topological features in the band structure of PdTe 2 in it's non-superconducting normal state [5][6][7] .…”

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confidence: 99%

Mixed type I and type II superconductivity due to intrinsic electronic inhomogeneities in the type II Dirac semimetal PdTe₂

Sirohi

Das

Adhikary

et al. 2019

J. Phys.: Condens. Matter

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The type II Dirac semimetal PdTe2 is unique in the family of topological parent materials because it displays a superconducting ground state below 1.7 K. Despite wide speculations on the possibility of an unconventional topological superconducting phase, tunneling and heat capacity measurements revealed that the superconducting phase of PdTe2 follows predictions of the microscopic theory of Bardeen, Cooper and Shriefer (BCS) for conventional superconductors. The superconducting phase in PdTe2 is further interesting because it also displays properties that are characteristics of type-I superconductors and are generally unexpected for binary compounds. Here, from scanning tunneling spectroscopic measurements we show that the surface of PdTe2 displays intrinsic electronic inhomegenities in the normal state which leads to a mixed type I and type II superconducting behaviour along with a spatial distribution of critical fields in the superconducting state. Understanding of the origin of such inhomogeneities may be important for understanding the topological properties of PdTe2 in the normal state.PdTe 2 has been known to be a superconductor for almost six decades. 1-4 But, due to a very low critical temperature (∼ 1.7 K), the details of the superconducting phase of PdTe 2 did not receive much attention. The superconducting properties of PdTe 2 attracted renewed attention of the community following recent discovery of complex topological features in the band structure of PdTe 2 in it's non-superconducting normal state 5-7 . This discovery naturally led to the question of the possibility of a topological character of the superconducting phase of PdTe 2 . 6 This question is extremely important because a single material showing both topological character and superconductivity in it's parental stoichiometric phase is thought to be the best candidate to show topological superconductivity [8][9][10][11][12][13][14][15][16][17][18] . Immediately after the discovery of the topological nature of PdTe 2 , 5,6 transport and magnetization experiments revealed a peculiar type-I like superconducting phase but with multiple critical fields (H c ). 19,20 The possible type-I nature of superconductivity in PdTe 2 is unique because only elemental metals are known to show type-I superconductivity and superconductivity in binary compounds and alloys are generally seen to be of type II with perhaps only one exception of TaSi 2 21 . The observation of multiple critical fields in PdTe 2 was attributed to the possibility of an anisotropic superconducting order parameter and to an enhanced critical field of the surface sheath (H s c ) of PdTe 2 . 19,20 However, the measured H s c turned out to be around 3000 G which is one order of magnitude higher than H c ∼ 250 G. This deviates from the expected value for a standard Saint-James-deGennes (SJdG) surface critical field which, in principle, should be less than 1.7 H c . 22-24 This * Electronic address: anshusirohi@iisermohali.ac.in † Electronic address: goutam@iisermohali.ac.in mismatch of the me...

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“…13) Thus, the transition can be characterized by the formation of Ir-Ir bonds along the b-axis of the monoclinic unit cell, which deforms the regular triangular lattice into an isosceles triangle. No superconductivity has been reported for IrTe 2 down to 0.32 K 14) or for PtTe 2 down to 1.2 K. 15) Polycrystalline samples of solid solutions of Ir 1Àx Pt x Te 2 with 0:00 x 0:25 were synthesized using a solid-state reaction. Stoichiometric amounts of Ir, Pt, and Te were mixed, pelletized, and sealed in an evacuated quartz ampule.…”

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confidence: 99%

Superconductivity Induced by Bond Breaking in the Triangular Lattice of IrTe₂

2012

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IrTe 2 , a layered compound with a triangular iridium lattice, exhibits a structural phase transition at approximately 250 K. This transition is characterized by the formation of Ir-Ir bonds along the b-axis. We found that the breaking of Ir-Ir bonds that occurs in Ir 1Àx Pt x Te 2 results in the appearance of a structural critical point in the T ¼ 0 limit at x c ' 0:035. Although both IrTe 2 and PtTe 2 are paramagnetic metals, superconductivity at T c ¼ 3:1 K is induced by the bond breaking in a narrow range of x ! x c in Ir 1Àx Pt x Te 2 . This result indicates that structural fluctuations can be involved in the emergence of superconductivity.

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The occurrence of superconductivity in sulfides, selenides, tellurides of Pt-group metals

Cited by 71 publications

References 20 publications

Superconductivity in a new layered triangular-lattice system Li₂IrSi₂

Superconductivity in a new layered triangular-lattice system Li₂IrSi₂

Mixed type I and type II superconductivity due to intrinsic electronic inhomogeneities in the type II Dirac semimetal PdTe₂

Superconductivity Induced by Bond Breaking in the Triangular Lattice of IrTe₂

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The occurrence of superconductivity in sulfides, selenides, tellurides of Pt-group metals

Cited by 71 publications

References 20 publications

Superconductivity in a new layered triangular-lattice system Li2IrSi2

Superconductivity in a new layered triangular-lattice system Li2IrSi2

Mixed type I and type II superconductivity due to intrinsic electronic inhomogeneities in the type II Dirac semimetal PdTe2

Superconductivity Induced by Bond Breaking in the Triangular Lattice of IrTe2

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Superconductivity in a new layered triangular-lattice system Li₂IrSi₂

Superconductivity in a new layered triangular-lattice system Li₂IrSi₂

Mixed type I and type II superconductivity due to intrinsic electronic inhomogeneities in the type II Dirac semimetal PdTe₂

Superconductivity Induced by Bond Breaking in the Triangular Lattice of IrTe₂