Pressure-induced magnetic collapse and metallization of TlFe1.6Se2

The crystal structure, magnetic ordering, and electrical resistivity of TlFe1.6Se2 were studied at high pressures. Below ∼7GPa, TlFe1.6Se2 is an antiferromagnetically ordered semiconductor with a ThCr2Si2-type structure. The insulator-to-metal transformation observed at a pressure of ∼7GPa is accomp...

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Bibliographic Details
Published in:Physical review. B 2017-08, Vol.96 (6)
Main Authors: Naumov, P G, Filsinger, K, Shylin, S I, Barkalov, O I, Ksenofontov, V, Qi, Y, Palasyuk, T, Schnelle, W, Medvedev, S A, Greenblatt, M, Felser, C
Format: Article
Language:English
Subjects:
Antiferromagnetism
Crystal structure
Electrical resistivity
Magnetic transitions
Metallizing
Phase separation
Phase transitions
Superconductivity
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Summary:The crystal structure, magnetic ordering, and electrical resistivity of TlFe1.6Se2 were studied at high pressures. Below ∼7GPa, TlFe1.6Se2 is an antiferromagnetically ordered semiconductor with a ThCr2Si2-type structure. The insulator-to-metal transformation observed at a pressure of ∼7GPa is accompanied by a loss of magnetic ordering and an isostructural phase transition. In the pressure range ∼7.5–11GPa a remarkable downturn in resistivity, which resembles a superconducting transition, is observed below 15 K. We discuss this feature as the possible onset of superconductivity originating from a phase separation in a small fraction of the sample in the vicinity of the magnetic transition.
ISSN:2469-9950
2469-9969
DOI:10.1103/PhysRevB.96.064109