Fragile Pressure-Induced Magnetism in FeSe Superconductors with a Thickness Reduction

Xie，Jianyu1; Liu，Xinyou1; Zhang，Wei1; Wong，Sum Ming1; Zhou，Xuefeng2; Zhao，Yusheng2; Wang，Shanmin2; Lai，Kwing To1; Goh，Swee K.1

2021

10.1021/acs.nanolett.1c03508

NANO LETTERS   影响因子和分区

1530-6984

1530-6992

The emergence of high transition temperature (Tc) superconductivity in bulk FeSe under pressure is associated with the tuning of nematicity and magnetism. However, sorting out the relative contributions from magnetic and nematic fluctuations to the enhancement of Tc remains challenging. Here, we design and conduct a series of high-pressure experiments on FeSe thin flakes. We find that as the thickness decreases the nematic phase boundary on temperature-pressure phase diagrams remains robust while the magnetic order is significantly weakened. A local maximum of Tc is observed outside the nematic phase region, not far from the extrapolated nematic end point in all samples. However, the maximum Tc value is reduced associated with the weakening of magnetism. No high-Tc phase is observed in the thinnest sample. Our results strongly suggest that nematic fluctuations alone can only have a limited effect while magnetic fluctuations are pivotal on the enhancement of Tc in FeSe.

FeSe hydrostatic pressure Iron-based superconductor phase diagrams thin flakes

SCI ; EI

英语

NI期刊

其他

Research Grants Council of Hong Kong["CUHK 14301020","A-CUHK402/19"] ; CUHK Direct Grant[4053461,4053408,4053410,4053463] ; Key Research Platforms and Research Projects of Universities in Guangdong Province[2018KZDXM062]

Chemistry ; Science & Technology - Other Topics ; Materials Science ; Physics

Chemistry, Multidisciplinary ; Chemistry, Physical ; Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Physics, Applied ; Physics, Condensed Matter

WOS:000718298700048

AMER CHEMICAL SOC

20214611151715

Hydrostatic pressure ; Iron compounds ; Magnetism ; Phase diagrams ; Selenium compounds

Liquid Dynamics:631.1.1 ; Magnetism: Basic Concepts and Phenomena:701.2 ; High Temperature Superconducting Materials:708.3.1

MATERIALS SCIENCE

2-s2.0-85118824565

Scopus

1.Department of Physics,Chinese University of Hong Kong,Hong Kong,Hong Kong
2.Department of Physics,Southern University of Science and Technology,Shenzhen,Guangdong,518055,China

Xie，Jianyu,Liu，Xinyou,Zhang，Wei,et al. Fragile Pressure-Induced Magnetism in FeSe Superconductors with a Thickness Reduction[J]. NANO LETTERS,2021,21(21):9310-9317.

Xie，Jianyu.,Liu，Xinyou.,Zhang，Wei.,Wong，Sum Ming.,Zhou，Xuefeng.,...&Goh，Swee K..(2021).Fragile Pressure-Induced Magnetism in FeSe Superconductors with a Thickness Reduction.NANO LETTERS,21(21),9310-9317.

Xie，Jianyu,et al."Fragile Pressure-Induced Magnetism in FeSe Superconductors with a Thickness Reduction".NANO LETTERS 21.21(2021):9310-9317.