Enhanced superconducting pairing interaction in indium-doped tin telluride
A. S. Erickson, J.-H. Chu, M. F. Toney, T. H. Geballe, I. R. Fisher
DOI 10.1103/PhysRevB.79.024520 · Physical Review B
Active bibliographic source — not scientific approval
Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.
Abstract
The ferroelectric degenerate semiconductor Sn1−δTe exhibits superconductivity with critical temperatures, Tc, of up to 0.3 K for hole densities of order 1021 cm−3. When doped on the tin site with greater than xc=1.7(3)% indium atoms, however, superconductivity is observed up to 2 K, though the carrier density does not change significantly. We present specific-heat data showing that a stronger pairing interaction is present for x>xc than for x<xc. By examining the effect of In dopant atoms on both Tc and the temperature of the ferroelectric structural phase transition, TSPT, we show that phonon modes related to this transition are not responsible for this Tc enhancement, and discuss a plausible candidate based on negative U pairing associated with mixed valency on the indium impurity sites.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Sn1-δTe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.3 | Pressure not reported | unknown |
| Sn1-δ-xInxTe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2 | Pressure not reported | unknown |
| Pb1-xTlxTe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| BaPb1-xBixO3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Sn0.995-xInxTe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.8 | Pressure not reported | midpoint |
| Sn0.995-xInxTe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.8 | Pressure not reported | onset |
Similar papers
Anomalous composition dependence of the superconductivity in In-doped SnTe
similarity 0.95Neel Haldolaarachchige et al.
Source status unknown — claims are unverified
Superconducting properties of Sn1−xInxTe (x=0.38–0.45) studied using muon-spin spectroscopy
similarity 0.95M. Saghir et al.
Source status unknown — claims are unverified
Superconductivity, pairing symmetry, and disorder in the doped topological insulator Sn1−xInxTe for x≥0.10
similarity 0.95M. P. Smylie et al.
Source status unknown — claims are unverified
Microscopic characterization of the superconducting gap function in Sn1−xInxTe
similarity 0.95T. Nomoto et al.
Source status unknown — claims are unverified
Nuclear magnetic relaxation rates of unconventional superconductivity in doped topological insulators
similarity 0.95Yuki Nagai & Yukihiro Ota
Source status unknown — claims are unverified
Superconducting properties of the In-substituted topological crystalline insulator SnTe
similarity 0.94G. Balakrishnan et al.
Source status unknown — claims are unverified