TY - JOUR
T1 - Superconductor-insulator transition in fcc GeS b2 T e4 at elevated pressures
AU - Hen, Bar
AU - Layek, Samar
AU - Goldstein, Moshe
AU - Shelukhin, Victor
AU - Shulman, Mark
AU - Karpovski, Michael
AU - Greenberg, Eran
AU - Sterer, Eran
AU - Dagan, Yoram
AU - Rozenberg, Gregory Kh
AU - Palevski, Alexander
N1 - Publisher Copyright:
© 2018 American Physical Society.
PY - 2018/1/23
Y1 - 2018/1/23
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=85040911732&partnerID=8YFLogxK
U2 - 10.1103/PhysRevB.97.024513
DO - 10.1103/PhysRevB.97.024513
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AN - SCOPUS:85040911732
SN - 2469-9950
VL - 97
JO - Physical Review B
JF - Physical Review B
IS - 2
M1 - 024513
ER -