Superconductor-insulator transition in fcc GeS b2 T e4 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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

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.

Original languageEnglish
Article number024513
JournalPhysical Review B
Volume97
Issue number2
DOIs
StatePublished - 23 Jan 2018

Funding

FundersFunder number
Advanced Photon Source
DOE Office of Science
Israeli Science Foundation227/15, 277/16, 1189/14
Office of Science User Facility operated
Pazi foundation268/15
U.S. Department of EnergyDE-FG02-94ER14466
Argonne National Laboratory
National Academy of Agricultural SciencesEAR-1634415
German-Israeli Foundation for Scientific Research and DevelopmentI-1259-303.10/2014
United States-Israel Binational Science Foundation2014098, 2014262
Ministry of Science and Technology, Israel3-12419, 3-11875

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