Superconductor-insulator transition in fcc GeSb2Te4 at elevated pressures
Bar Hen, Samar Layek, Moshe Goldstein, Victor Shelukhin, Mark Shulman, Michael Karpovski, Eran Greenberg, Eran Sterer, Yoram Dagan, Gregory Kh. Rozenberg, Alexander Palevski
DOI 10.1103/PhysRevB.97.024513 · Physical Review B
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Abstract
We show that polycrystalline GeSb2Te4 in the fcc phase (f-GST), which is an insulator at low temperature at ambient pressure, becomes a superconductor at elevated pressures. Our study of the superconductor-insulator transition versus pressure at low temperatures reveals a second-order quantum phase transition with linear dependence of the transition temperature on the pressure above the critical zero-temperature pressure. In addition, we demonstrate that at higher pressures the f-GST goes through a structural phase transition via amorphization to bcc GST (b-GST), which also becomes superconducting. We also find that in the pressure regime where an inhomogeneous mixture of amorphous and b-GST exists, there is an anomalous peak in magnetoresistance, and we suggest an explanation for this anomaly.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| GeSb2Te4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.8 | 4 GPa | midpoint |
| GeSb2Te4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 5.8 | 10.4 GPa | midpoint |
| GeSb2Te4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 6.6 | 27 GPa | midpoint |
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