Nematic fluctuations in an orbital selective superconductor Fe1+yTe1−xSex

Qianni Jiang; Yue Shi; Morten H. Christensen; Joshua J. Sanchez; Bevin Huang; Zhong Lin; Zhaoyu Liu; Paul Malinowski; Xiaodong Xu; Rafael M. Fernandes; Jiun Haw Chu

doi:10.1038/s42005-023-01154-8

Nematic fluctuations in an orbital selective superconductor Fe_1+yTe_1−xSe_x

Qianni Jiang, Yue Shi, Morten H. Christensen, Joshua J. Sanchez, Bevin Huang, Zhong Lin, Zhaoyu Liu, Paul Malinowski, Xiaodong Xu, Rafael M. Fernandes, Jiun Haw Chu

Physics and Astronomy (Twin Cities)

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

2 Scopus citations

Abstract

Fe_1+yTe_1−xSe_x is characterized by its complex magnetic phase diagram and highly orbital-dependent band renormalization. Despite this, the behavior of nematicity and nematic fluctuations, especially for high tellurium concentrations, remains largely unknown. Here we present a study of both B_1g and B_2g nematic fluctuations in Fe_1+yTe_1−xSe_x (0 ≤ x ≤ 0.53) using the technique of elastoresistivity measurement. We discovered that the nematic fluctuations in two symmetry channels are closely linked to the corresponding spin fluctuations, confirming the intertwined nature of these two degrees of freedom. We also revealed an unusual temperature dependence of the nematic susceptibility, which we attributed to a loss of coherence of the d_xy orbital. Our results highlight the importance of orbital differentiation on the nematic properties of iron-based materials.

Original language	English (US)
Article number	39
Journal	Communications Physics
Volume	6
Issue number	1
DOIs	https://doi.org/10.1038/s42005-023-01154-8
State	Published - Dec 2023

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© 2023, The Author(s).

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title = "Nematic fluctuations in an orbital selective superconductor Fe1+yTe1−xSex",

abstract = "Fe1+yTe1−xSex is characterized by its complex magnetic phase diagram and highly orbital-dependent band renormalization. Despite this, the behavior of nematicity and nematic fluctuations, especially for high tellurium concentrations, remains largely unknown. Here we present a study of both B1g and B2g nematic fluctuations in Fe1+yTe1−xSex (0 ≤ x ≤ 0.53) using the technique of elastoresistivity measurement. We discovered that the nematic fluctuations in two symmetry channels are closely linked to the corresponding spin fluctuations, confirming the intertwined nature of these two degrees of freedom. We also revealed an unusual temperature dependence of the nematic susceptibility, which we attributed to a loss of coherence of the dxy orbital. Our results highlight the importance of orbital differentiation on the nematic properties of iron-based materials.",

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T1 - Nematic fluctuations in an orbital selective superconductor Fe1+yTe1−xSex

AU - Jiang, Qianni

AU - Shi, Yue

AU - Christensen, Morten H.

AU - Sanchez, Joshua J.

AU - Huang, Bevin

AU - Lin, Zhong

AU - Liu, Zhaoyu

AU - Malinowski, Paul

AU - Xu, Xiaodong

AU - Fernandes, Rafael M.

AU - Chu, Jiun Haw

PY - 2023/12

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AB - Fe1+yTe1−xSex is characterized by its complex magnetic phase diagram and highly orbital-dependent band renormalization. Despite this, the behavior of nematicity and nematic fluctuations, especially for high tellurium concentrations, remains largely unknown. Here we present a study of both B1g and B2g nematic fluctuations in Fe1+yTe1−xSex (0 ≤ x ≤ 0.53) using the technique of elastoresistivity measurement. We discovered that the nematic fluctuations in two symmetry channels are closely linked to the corresponding spin fluctuations, confirming the intertwined nature of these two degrees of freedom. We also revealed an unusual temperature dependence of the nematic susceptibility, which we attributed to a loss of coherence of the dxy orbital. Our results highlight the importance of orbital differentiation on the nematic properties of iron-based materials.

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