Direct observation of the hybridization gap in both the hidden order and large moment antiferromagnetic phases in URu2Si2

Wen Zhang; Wei Feng; Xuebing Luo; Shiyong Tan; Donghua Xie; Yi Liu; Yun Zhang; Qunqing Hao; Qiang Zhang; Xiegang Zhu; Qin Liu; Qiuyun Chen; Xinchun Lai

doi:10.1103/PhysRevB.106.165109

Direct observation of the hybridization gap in both the hidden order and large moment antiferromagnetic phases in URu2Si2

Wen Zhang, Wei Feng, Xuebing Luo, Shiyong Tan, Donghua Xie, Yi Liu, Yun Zhang, Qunqing Hao, Qiang Zhang, Xiegang Zhu, Qin Liu, Qiuyun Chen, Xinchun Lai

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

3 Scopus citations

Abstract

Despite extensive research on the heavy fermion superconductor URu2Si2 in the past three decades, the nature of the hidden order (HO) phase transition occurring at 17.5 K remains ambiguous. Here we report a comparative scanning tunneling microscopy/spectroscopy (STM/STS) study on different terminations of the parent URu2Si2 and Fe-doped samples. A small gap, which was ascribed to the HO parameter by previous STM/STS studies, emerges in both the HO and large moment antiferromagnetic phases on the U terminations, indicating it is not the unique hallmark of the HO parameter. Moreover, a peak-gap-peak structure is observed on the Si terminations. Variations of the two spectral features with Fe concentration and temperature show that they stem from the alteration of f-c hybridization. The higher vanishing temperatures and larger sizes of the gap in the Fe-substituted samples indicate stronger f-c hybridization strength compared to URu2Si2. Our studies demonstrate hybridization is not the driving force for the HO phase transition.

Original language	English
Article number	165109
Journal	Physical Review B
Volume	106
Issue number	16
DOIs	https://doi.org/10.1103/PhysRevB.106.165109
State	Published - Oct 15 2022
Externally published	Yes

Funding

This work was supported by the National Natural Science Foundation of China (Grants No. 12122409, No. 11874330, No. 11904335, No. 11904334, and No. 12004349), the National Key Research and Development Program of China (Grants No. 2021YFA1601100, No. 2017YFA0303104, and No. 2016YFA0300200), and the Natural Science Foundation of the Southwest University of Science and Technology (Grant No. 19zx7127).

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title = "Direct observation of the hybridization gap in both the hidden order and large moment antiferromagnetic phases in URu2Si2",

abstract = "Despite extensive research on the heavy fermion superconductor URu2Si2 in the past three decades, the nature of the hidden order (HO) phase transition occurring at 17.5 K remains ambiguous. Here we report a comparative scanning tunneling microscopy/spectroscopy (STM/STS) study on different terminations of the parent URu2Si2 and Fe-doped samples. A small gap, which was ascribed to the HO parameter by previous STM/STS studies, emerges in both the HO and large moment antiferromagnetic phases on the U terminations, indicating it is not the unique hallmark of the HO parameter. Moreover, a peak-gap-peak structure is observed on the Si terminations. Variations of the two spectral features with Fe concentration and temperature show that they stem from the alteration of f-c hybridization. The higher vanishing temperatures and larger sizes of the gap in the Fe-substituted samples indicate stronger f-c hybridization strength compared to URu2Si2. Our studies demonstrate hybridization is not the driving force for the HO phase transition.",

author = "Wen Zhang and Wei Feng and Xuebing Luo and Shiyong Tan and Donghua Xie and Yi Liu and Yun Zhang and Qunqing Hao and Qiang Zhang and Xiegang Zhu and Qin Liu and Qiuyun Chen and Xinchun Lai",

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AU - Zhang, Wen

AU - Feng, Wei

AU - Luo, Xuebing

AU - Tan, Shiyong

AU - Xie, Donghua

AU - Liu, Yi

AU - Zhang, Yun

AU - Hao, Qunqing

AU - Zhang, Qiang

AU - Zhu, Xiegang

AU - Liu, Qin

AU - Chen, Qiuyun

AU - Lai, Xinchun

PY - 2022/10/15

Y1 - 2022/10/15

N2 - Despite extensive research on the heavy fermion superconductor URu2Si2 in the past three decades, the nature of the hidden order (HO) phase transition occurring at 17.5 K remains ambiguous. Here we report a comparative scanning tunneling microscopy/spectroscopy (STM/STS) study on different terminations of the parent URu2Si2 and Fe-doped samples. A small gap, which was ascribed to the HO parameter by previous STM/STS studies, emerges in both the HO and large moment antiferromagnetic phases on the U terminations, indicating it is not the unique hallmark of the HO parameter. Moreover, a peak-gap-peak structure is observed on the Si terminations. Variations of the two spectral features with Fe concentration and temperature show that they stem from the alteration of f-c hybridization. The higher vanishing temperatures and larger sizes of the gap in the Fe-substituted samples indicate stronger f-c hybridization strength compared to URu2Si2. Our studies demonstrate hybridization is not the driving force for the HO phase transition.

AB - Despite extensive research on the heavy fermion superconductor URu2Si2 in the past three decades, the nature of the hidden order (HO) phase transition occurring at 17.5 K remains ambiguous. Here we report a comparative scanning tunneling microscopy/spectroscopy (STM/STS) study on different terminations of the parent URu2Si2 and Fe-doped samples. A small gap, which was ascribed to the HO parameter by previous STM/STS studies, emerges in both the HO and large moment antiferromagnetic phases on the U terminations, indicating it is not the unique hallmark of the HO parameter. Moreover, a peak-gap-peak structure is observed on the Si terminations. Variations of the two spectral features with Fe concentration and temperature show that they stem from the alteration of f-c hybridization. The higher vanishing temperatures and larger sizes of the gap in the Fe-substituted samples indicate stronger f-c hybridization strength compared to URu2Si2. Our studies demonstrate hybridization is not the driving force for the HO phase transition.

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Direct observation of the hybridization gap in both the hidden order and large moment antiferromagnetic phases in URu2Si2

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