125Te-NMR study on a single crystal of heavy fermion superconductor Ute2

Yo Tokunaga; Hironori Sakai; Shinsaku Kambe; Taisuke Hattori; Nonoka Higa; Genki Nakamine; Shunsaku Kitagawa; Kenji Ishida; Ai Nakamura; Yusei Shimizu; Yoshiya Homma; De Xin Li; Fuminori Honda; Dai Aoki

doi:10.7566/JPSJ.88.073701

¹²⁵Te-NMR study on a single crystal of heavy fermion superconductor Ute₂

Yo Tokunaga, Hironori Sakai, Shinsaku Kambe, Taisuke Hattori, Nonoka Higa, Genki Nakamine, Shunsaku Kitagawa, Kenji Ishida, Ai Nakamura, Yusei Shimizu, Yoshiya Homma, De Xin Li, Fuminori Honda, Dai Aoki

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Abstract

We report ¹²⁵Te NMR studies on a newly discovered heavy fermion superconductor UTe₂. Using a single crystal, we have measured the ¹²⁵Te NMR Knight shift K and spin-lattice relaxation rate 1=T₁ for fields along the three orthorhombic crystal axes. The data confirm a moderate Ising anisotropy for both the static (K) and dynamical susceptibilities (1=T₁) in the paramagnetic state above about 20 K. Around 20 K, however, we have observed a sudden loss of NMR spin-echo signal due to sudden enhancement of the NMR spin-spin relaxation rate 1=T₂, when the field is applied along the easy axis of magnetization (= a-axis). This behavior suggests the development of longitudinal magnetic fluctuations along the a-axis at very low frequencies below 20 K.

Original language	English
Article number	073701
Journal	Journal of the Physical Society of Japan
Volume	88
Issue number	7
DOIs	https://doi.org/10.7566/JPSJ.88.073701
Publication status	Published - 2019

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Tokunaga, Y., Sakai, H., Kambe, S., Hattori, T., Higa, N., Nakamine, G., Kitagawa, S., Ishida, K., Nakamura, A., Shimizu, Y., Homma, Y., Li, D. X., Honda, F., & Aoki, D. (2019). ¹²⁵Te-NMR study on a single crystal of heavy fermion superconductor Ute₂ Journal of the Physical Society of Japan, 88(7), Article 073701. https://doi.org/10.7566/JPSJ.88.073701

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title = "125Te-NMR study on a single crystal of heavy fermion superconductor Ute2 ",

abstract = "We report 125Te NMR studies on a newly discovered heavy fermion superconductor UTe2. Using a single crystal, we have measured the 125Te NMR Knight shift K and spin-lattice relaxation rate 1=T1 for fields along the three orthorhombic crystal axes. The data confirm a moderate Ising anisotropy for both the static (K) and dynamical susceptibilities (1=T1) in the paramagnetic state above about 20 K. Around 20 K, however, we have observed a sudden loss of NMR spin-echo signal due to sudden enhancement of the NMR spin-spin relaxation rate 1=T2, when the field is applied along the easy axis of magnetization (= a-axis). This behavior suggests the development of longitudinal magnetic fluctuations along the a-axis at very low frequencies below 20 K.",

author = "Yo Tokunaga and Hironori Sakai and Shinsaku Kambe and Taisuke Hattori and Nonoka Higa and Genki Nakamine and Shunsaku Kitagawa and Kenji Ishida and Ai Nakamura and Yusei Shimizu and Yoshiya Homma and Li, {De Xin} and Fuminori Honda and Dai Aoki",

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doi = "10.7566/JPSJ.88.073701",

language = "English",

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T1 - 125Te-NMR study on a single crystal of heavy fermion superconductor Ute2

AU - Tokunaga, Yo

AU - Sakai, Hironori

AU - Kambe, Shinsaku

AU - Hattori, Taisuke

AU - Higa, Nonoka

AU - Nakamine, Genki

AU - Kitagawa, Shunsaku

AU - Ishida, Kenji

AU - Nakamura, Ai

AU - Shimizu, Yusei

AU - Homma, Yoshiya

AU - Li, De Xin

AU - Honda, Fuminori

AU - Aoki, Dai

PY - 2019

Y1 - 2019

N2 - We report 125Te NMR studies on a newly discovered heavy fermion superconductor UTe2. Using a single crystal, we have measured the 125Te NMR Knight shift K and spin-lattice relaxation rate 1=T1 for fields along the three orthorhombic crystal axes. The data confirm a moderate Ising anisotropy for both the static (K) and dynamical susceptibilities (1=T1) in the paramagnetic state above about 20 K. Around 20 K, however, we have observed a sudden loss of NMR spin-echo signal due to sudden enhancement of the NMR spin-spin relaxation rate 1=T2, when the field is applied along the easy axis of magnetization (= a-axis). This behavior suggests the development of longitudinal magnetic fluctuations along the a-axis at very low frequencies below 20 K.

AB - We report 125Te NMR studies on a newly discovered heavy fermion superconductor UTe2. Using a single crystal, we have measured the 125Te NMR Knight shift K and spin-lattice relaxation rate 1=T1 for fields along the three orthorhombic crystal axes. The data confirm a moderate Ising anisotropy for both the static (K) and dynamical susceptibilities (1=T1) in the paramagnetic state above about 20 K. Around 20 K, however, we have observed a sudden loss of NMR spin-echo signal due to sudden enhancement of the NMR spin-spin relaxation rate 1=T2, when the field is applied along the easy axis of magnetization (= a-axis). This behavior suggests the development of longitudinal magnetic fluctuations along the a-axis at very low frequencies below 20 K.

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ER -

¹²⁵Te-NMR study on a single crystal of heavy fermion superconductor Ute₂

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