Pressure effect on superconductivity in FeSe0.5Te0.5

Sergii I. Shylin; Vadim Ksenofontov; Pavel G. Naumov; Sergey A. Medvedev; Vladimir Tsurkan; Joachim Deisenhofer; Alois Loidl; Leslie M. Schoop; Taras Palasyuk; Gerhard Wortmann; Claudia Felser

doi:10.1002/pssb.201600161

Pressure effect on superconductivity in FeSe_0.5Te_0.5

Sergii I. Shylin, Vadim Ksenofontov, Pavel G. Naumov, Sergey A. Medvedev, Vladimir Tsurkan, Joachim Deisenhofer, Alois Loidl, Leslie M. Schoop, Taras Palasyuk, Gerhard Wortmann, Claudia Felser

Research output: Contribution to journal › Article › peer-review

8 Scopus citations

Abstract

Due to the simple layered structure, isostructural FeSe and FeSe_0.5Te_0.5 are clue compounds for understanding the principal mechanisms of superconductivity in the family of Fe-based superconductors. High-pressure magnetic, structural and Mössbauer studies have been performed on single-crystalline samples of superconducting FeSe_0.5Te_0.5 with T_c = 13.5 K. Susceptibility data have revealed a strong increase of T_c up to 19.5 K for pressures up to 1.3 GPa, followed by a plateau in the T_c(p) dependence up to 5.0 GPa. Further pressure increase leads to a disappearance of the superconducting state around 7.0 GPa. X-ray diffraction and Mössbauer studies explain this fact by a tetragonal-to-hexagonal structural phase transition. Mössbauer parameters of the non-superconducting high-pressure phase indicate less covalency of FeSe bonds. Based on structural and susceptibility data, we conclude about a common character of T_c(p) diagrams for both FeSe and FeSe_0.5Te_0.5 superconductors.

Original language	English (US)
Article number	1600161
Journal	Physica Status Solidi (B) Basic Research
Volume	254
Issue number	1
DOIs	https://doi.org/10.1002/pssb.201600161
State	Published - Jan 1 2017
Externally published	Yes

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

Keywords

Mössbauer spectroscopy
high pressure
iron chalcogenides
superconductivity
synchrotron X-ray diffraction

Access to Document

10.1002/pssb.201600161

Cite this

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title = "Pressure effect on superconductivity in FeSe0.5Te0.5 ",

abstract = "Due to the simple layered structure, isostructural FeSe and FeSe0.5Te0.5 are clue compounds for understanding the principal mechanisms of superconductivity in the family of Fe-based superconductors. High-pressure magnetic, structural and M{\"o}ssbauer studies have been performed on single-crystalline samples of superconducting FeSe0.5Te0.5 with Tc = 13.5 K. Susceptibility data have revealed a strong increase of Tc up to 19.5 K for pressures up to 1.3 GPa, followed by a plateau in the Tc(p) dependence up to 5.0 GPa. Further pressure increase leads to a disappearance of the superconducting state around 7.0 GPa. X-ray diffraction and M{\"o}ssbauer studies explain this fact by a tetragonal-to-hexagonal structural phase transition. M{\"o}ssbauer parameters of the non-superconducting high-pressure phase indicate less covalency of FeSe bonds. Based on structural and susceptibility data, we conclude about a common character of Tc(p) diagrams for both FeSe and FeSe0.5Te0.5 superconductors.",

keywords = "M{\"o}ssbauer spectroscopy, high pressure, iron chalcogenides, superconductivity, synchrotron X-ray diffraction",

author = "Shylin, {Sergii I.} and Vadim Ksenofontov and Naumov, {Pavel G.} and Medvedev, {Sergey A.} and Vladimir Tsurkan and Joachim Deisenhofer and Alois Loidl and Schoop, {Leslie M.} and Taras Palasyuk and Gerhard Wortmann and Claudia Felser",

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TY - JOUR

T1 - Pressure effect on superconductivity in FeSe0.5Te0.5

AU - Shylin, Sergii I.

AU - Ksenofontov, Vadim

AU - Naumov, Pavel G.

AU - Medvedev, Sergey A.

AU - Tsurkan, Vladimir

AU - Deisenhofer, Joachim

AU - Loidl, Alois

AU - Schoop, Leslie M.

AU - Palasyuk, Taras

AU - Wortmann, Gerhard

AU - Felser, Claudia

PY - 2017/1/1

Y1 - 2017/1/1

N2 - Due to the simple layered structure, isostructural FeSe and FeSe0.5Te0.5 are clue compounds for understanding the principal mechanisms of superconductivity in the family of Fe-based superconductors. High-pressure magnetic, structural and Mössbauer studies have been performed on single-crystalline samples of superconducting FeSe0.5Te0.5 with Tc = 13.5 K. Susceptibility data have revealed a strong increase of Tc up to 19.5 K for pressures up to 1.3 GPa, followed by a plateau in the Tc(p) dependence up to 5.0 GPa. Further pressure increase leads to a disappearance of the superconducting state around 7.0 GPa. X-ray diffraction and Mössbauer studies explain this fact by a tetragonal-to-hexagonal structural phase transition. Mössbauer parameters of the non-superconducting high-pressure phase indicate less covalency of FeSe bonds. Based on structural and susceptibility data, we conclude about a common character of Tc(p) diagrams for both FeSe and FeSe0.5Te0.5 superconductors.

AB - Due to the simple layered structure, isostructural FeSe and FeSe0.5Te0.5 are clue compounds for understanding the principal mechanisms of superconductivity in the family of Fe-based superconductors. High-pressure magnetic, structural and Mössbauer studies have been performed on single-crystalline samples of superconducting FeSe0.5Te0.5 with Tc = 13.5 K. Susceptibility data have revealed a strong increase of Tc up to 19.5 K for pressures up to 1.3 GPa, followed by a plateau in the Tc(p) dependence up to 5.0 GPa. Further pressure increase leads to a disappearance of the superconducting state around 7.0 GPa. X-ray diffraction and Mössbauer studies explain this fact by a tetragonal-to-hexagonal structural phase transition. Mössbauer parameters of the non-superconducting high-pressure phase indicate less covalency of FeSe bonds. Based on structural and susceptibility data, we conclude about a common character of Tc(p) diagrams for both FeSe and FeSe0.5Te0.5 superconductors.

KW - Mössbauer spectroscopy

KW - high pressure

KW - iron chalcogenides

KW - superconductivity

KW - synchrotron X-ray diffraction

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