Synthesis, Structure, and Superconductivity in the New-Structure-Type Compound: SrPt₆P₂

Abstract

A metal-rich ternary phosphide, SrPt(6)P(2), with a unique structure type was synthesized at high temperatures. Its crystal structure was determined by single-crystal X-ray diffraction [cubic space group Pa3̅; Z = 4; a = 8.474(2) Å, and V = 608.51(2) Å(3)]. The structure features a unique three-dimensional anionic (Pt(6)P(2))(2-) network of vertex-shared Pt(6)P trigonal prisms. The Sr atoms occupy a 12-coordinate (Pt) cage site and form a cubic close-packed (face-centered-cubic) arrangement, and the P atoms formally occupy tetrahedral interstices. The metallic compound becomes superconducting at 0.6 K, as evidenced by magnetic and resistivity measurements.

High pressure crystal growth of the antiperovskite centrosymmetric superconductor SrPt3P

“…Note, that this composition is quite close to that recently reported for the new superconductor SrPt6P2 [6]. As mentioned above, the high-pressure cell is heated from both ends.…”

“…Among them, Pt-based systems have yielded numerous new intermetallic systems showing myriad structural and bonding features [2]. Evidence of unconventional superconductivity and/or novel physical properties has been reported in various Pt-related compounds, such as SrPtAs [3], SrPt2Ge2 [4], SrPtGe3 [5], SrPt6P2 [6], Ca2Pt3Si5 [7], MgPtSi [8], LaPt5As [9], and Li2Pt3B [10], as well as in renown strongly-correlated electron systems, such as UPt3 [11] and CePt3Si [12]. Recently, Takayama et al [13] discovered a new family of ternary platinum phosphide superconductors APt3P (A = Ca, Sr, and La) with Tcʼs of 8.4, 6.6, and 1.5 K, respectively.…”

“…Among them, Pt-based systems have yielded numerous new intermetallic systems showing myriad structural and bonding features [2]. Evidence of unconventional superconductivity and/or novel physical properties has been reported in various Pt-related compounds, such as SrPtAs [3], SrPt2Ge2 [4], SrPtGe3 [5], SrPt6P2 [6], Ca2Pt3Si5 [7],…”

Structural Phase Transitions and Superconductivity Induced in Antiperovskite Phosphide CaPd3P

“…a heavy-fermion superconductor with broken space inversion symmetry CePt 3 Si (T c = 0.75 K), 3 a possible topological superconductor Sr 3-δ SnO (T c = ~5 K), 4 spin-triplet superconductor Li 2 Pt 3 B (T c = ~2.8 K), 5,6 Ni-based compounds MgNi 3 C (T c = 8 K), 7 ZnNi 3 N (T c = ~3 K) 8 and CdNi 3 C (T c = ~3 K). 8,9 Regarding antiperovskite related phosphide, APt 3 P (T c = 8.4, 6.6, and 1.5 K for A = Sr, Ca, and La, respectively), 10 SrPt 6 P 2 (T c = 0.6 K) 11 and SrPt 10 P 4 (T c = 1.4 K) 12 are known superconductors other than Mg 2 Rh 3 P. Synthesis of phosphides is relatively difficult due to the high vapor pressure and high reactivity of P at high temperatures. We speculated that this may have hindered the exploration of new compounds for antiperovskite phosphides.…”

Sr2Pt8−x As: a layered incommensurately modulated metal with saturated resistivity

“…In the search for materials with novel electronic properties, the family of Pt-based ternary compounds is a good target because it is rich in various compositions, yet investigated only to a limited extent. In some, superconductivity and/or unconventional electronic properties have been reported, for example in SrPtAs (Nishikubo et al, 2011), SrPt 2 As 2 (Kudo et al, 2010), SrPt 3 P (Takayama et al, 2012), LaPt 5 As (Fujioka et al, 2016), SrPt 6 P 2 (Lv et al, 2014), SrPt 2 Ge 2 (Ku et al, 2013), SrPtGe 3 (Miliyanchuk et al, 2011) and Ca 2 Pt 3 Si 5 (Takeuchi et al, 2009).…”