Investigation of the Hyperfine Coupling Constant of Locally Noncentrosymmetric Heavy-fermion Superconductor CeRh2As2

Shiki Ogata; Shunsaku Kitagawa; Mayu Kibune; Kenji Ishida; Katsuki Kinjo; Manuel Brando; Christoph Geibel; Seunghyun Khim; Elena Hassinger

doi:10.3938/NPSM.73.1115

Investigation of the Hyperfine Coupling Constant of Locally Noncentrosymmetric Heavy-fermion Superconductor CeRh₂As₂

Shiki Ogata, Shunsaku Kitagawa, Mayu Kibune, Kenji Ishida, Katsuki Kinjo, Manuel Brando, Christoph Geibel, Seunghyun Khim, Elena Hassinger

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

Abstract

We performed ⁷⁵As-NMR measurements in H k ab to investigate the normal-state magnetic properties of CeRh2As2, a recently-discovered heavy-fermion superconductor. We compared the NMR Knight shift K with the magnetic susceptibility χ_ab, and estimated the hyperfine coupling constant A_hf from the slope of the K − χ plot. We observed that the magnitude of A_hf,ab at the As(1) site changes at around 20 K owing to emerging the heavy-fermion state, which was also observed in A_hf at the As(2) site and in H k c. The sign of A_hf,ab at the As(1) site is negative in low temperature. These are important for the analysis of the NMR results of CeRh2As2 in the superconducting state.

Original language	English
Pages (from-to)	1115-1118
Number of pages	4
Journal	New Physics: Sae Mulli
Volume	73
Issue number	12
DOIs	https://doi.org/10.3938/NPSM.73.1115
State	Published - Dec 2023
Externally published	Yes

Keywords

Heavy-fermion
Local inversion symmetry breaking
NMR
Superconductor

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10.3938/NPSM.73.1115

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title = "Investigation of the Hyperfine Coupling Constant of Locally Noncentrosymmetric Heavy-fermion Superconductor CeRh2As2",

abstract = "We performed 75As-NMR measurements in H k ab to investigate the normal-state magnetic properties of CeRh2As2, a recently-discovered heavy-fermion superconductor. We compared the NMR Knight shift K with the magnetic susceptibility χab, and estimated the hyperfine coupling constant Ahf from the slope of the K − χ plot. We observed that the magnitude of Ahf,ab at the As(1) site changes at around 20 K owing to emerging the heavy-fermion state, which was also observed in Ahf at the As(2) site and in H k c. The sign of Ahf,ab at the As(1) site is negative in low temperature. These are important for the analysis of the NMR results of CeRh2As2 in the superconducting state.",

keywords = "Heavy-fermion, Local inversion symmetry breaking, NMR, Superconductor",

author = "Shiki Ogata and Shunsaku Kitagawa and Mayu Kibune and Kenji Ishida and Katsuki Kinjo and Manuel Brando and Christoph Geibel and Seunghyun Khim and Elena Hassinger",

year = "2023",

month = dec,

doi = "10.3938/NPSM.73.1115",

language = "English",

volume = "73",

pages = "1115--1118",

journal = "New Physics: Sae Mulli",

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T1 - Investigation of the Hyperfine Coupling Constant of Locally Noncentrosymmetric Heavy-fermion Superconductor CeRh2As2

AU - Ogata, Shiki

AU - Kitagawa, Shunsaku

AU - Kibune, Mayu

AU - Ishida, Kenji

AU - Kinjo, Katsuki

AU - Brando, Manuel

AU - Geibel, Christoph

AU - Khim, Seunghyun

AU - Hassinger, Elena

PY - 2023/12

Y1 - 2023/12

N2 - We performed 75As-NMR measurements in H k ab to investigate the normal-state magnetic properties of CeRh2As2, a recently-discovered heavy-fermion superconductor. We compared the NMR Knight shift K with the magnetic susceptibility χab, and estimated the hyperfine coupling constant Ahf from the slope of the K − χ plot. We observed that the magnitude of Ahf,ab at the As(1) site changes at around 20 K owing to emerging the heavy-fermion state, which was also observed in Ahf at the As(2) site and in H k c. The sign of Ahf,ab at the As(1) site is negative in low temperature. These are important for the analysis of the NMR results of CeRh2As2 in the superconducting state.

AB - We performed 75As-NMR measurements in H k ab to investigate the normal-state magnetic properties of CeRh2As2, a recently-discovered heavy-fermion superconductor. We compared the NMR Knight shift K with the magnetic susceptibility χab, and estimated the hyperfine coupling constant Ahf from the slope of the K − χ plot. We observed that the magnitude of Ahf,ab at the As(1) site changes at around 20 K owing to emerging the heavy-fermion state, which was also observed in Ahf at the As(2) site and in H k c. The sign of Ahf,ab at the As(1) site is negative in low temperature. These are important for the analysis of the NMR results of CeRh2As2 in the superconducting state.

KW - Heavy-fermion

KW - Local inversion symmetry breaking

KW - NMR

KW - Superconductor

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Investigation of the Hyperfine Coupling Constant of Locally Noncentrosymmetric Heavy-fermion Superconductor CeRh₂As₂

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Keywords

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