Composition dependence of bulk superconductivity in YFe2Ge2

Jiasheng Chen; Monika B. Gamża; Konstantin Semeniuk; F. Malte Grosche

doi:10.1103/PhysRevB.99.020501

Composition dependence of bulk superconductivity in YFe2Ge2

Jiasheng Chen
, Monika B. Gamża
, Konstantin Semeniuk
, F. Malte Grosche

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

8 Citations (Scopus)

Abstract

In the layered iron-based superconductor YFe2Ge2, a high Sommerfeld ratio of ∼100mJ/molK2 and a T3/2 temperature dependence of the electrical resistivity at low temperature T indicate strong electronic correlations and point toward an unconventional pairing state. We have investigated the role of composition and annealing conditions in optimizing the growth of high-quality YFe2Ge2. Our findings confirm that bulk superconductivity is observed in samples with disorder scattering rates less than 2kBTc/a. Fe deficiency on the Fe site is identified as the dominant source of disorder, which can be minimized by precipitating from a slightly iron-rich melt, followed by annealing. © 2019 American Physical Society.

Original language	English
Article number	020501
Journal	Physical Review B
Volume	99
Issue number	2
DOIs	https://doi.org/10.1103/PhysRevB.99.020501
Publication status	Published - 2 Jan 2019
Externally published	Yes

Bibliographical note

Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to [email protected].

Funding

The work was supported by the EPSRC of the UK (Grants No. EP/K012894 and EP/P023290/1) and by Trinity College.

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title = "Composition dependence of bulk superconductivity in YFe2Ge2",

abstract = "In the layered iron-based superconductor YFe2Ge2, a high Sommerfeld ratio of ∼100mJ/molK2 and a T3/2 temperature dependence of the electrical resistivity at low temperature T indicate strong electronic correlations and point toward an unconventional pairing state. We have investigated the role of composition and annealing conditions in optimizing the growth of high-quality YFe2Ge2. Our findings confirm that bulk superconductivity is observed in samples with disorder scattering rates less than 2kBTc/a. Fe deficiency on the Fe site is identified as the dominant source of disorder, which can be minimized by precipitating from a slightly iron-rich melt, followed by annealing. {\textcopyright} 2019 American Physical Society.",

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AU - Chen, Jiasheng

AU - Gamża, Monika B.

AU - Semeniuk, Konstantin

AU - Grosche, F. Malte

N1 - Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to [email protected].

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N2 - In the layered iron-based superconductor YFe2Ge2, a high Sommerfeld ratio of ∼100mJ/molK2 and a T3/2 temperature dependence of the electrical resistivity at low temperature T indicate strong electronic correlations and point toward an unconventional pairing state. We have investigated the role of composition and annealing conditions in optimizing the growth of high-quality YFe2Ge2. Our findings confirm that bulk superconductivity is observed in samples with disorder scattering rates less than 2kBTc/a. Fe deficiency on the Fe site is identified as the dominant source of disorder, which can be minimized by precipitating from a slightly iron-rich melt, followed by annealing. © 2019 American Physical Society.

AB - In the layered iron-based superconductor YFe2Ge2, a high Sommerfeld ratio of ∼100mJ/molK2 and a T3/2 temperature dependence of the electrical resistivity at low temperature T indicate strong electronic correlations and point toward an unconventional pairing state. We have investigated the role of composition and annealing conditions in optimizing the growth of high-quality YFe2Ge2. Our findings confirm that bulk superconductivity is observed in samples with disorder scattering rates less than 2kBTc/a. Fe deficiency on the Fe site is identified as the dominant source of disorder, which can be minimized by precipitating from a slightly iron-rich melt, followed by annealing. © 2019 American Physical Society.

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DO - 10.1103/PhysRevB.99.020501

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JO - Physical Review B

JF - Physical Review B

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Composition dependence of bulk superconductivity in YFe2Ge2

Abstract

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