Long Range Antiferromagnetic Ordering Observed Below 20 mK in the Heavy Fermion Superconductor UPt3

Yoshihiro Koike; Naoto Metoki; Etsuji Yamamoto; Yoshinori Haga; Yoshichika Ōnuki; Noriaki Kimura; Yoshichika Ōnuki; Kunihiko Maezawa

doi:10.1143/JPSJ.67.1142

Long Range Antiferromagnetic Ordering Observed Below 20 mK in the Heavy Fermion Superconductor UPt₃

Yoshihiro Koike, Naoto Metoki, Etsuji Yamamoto, Yoshinori Haga, Yoshichika Ōnuki, Noriaki Kimura, Yoshichika Ōnuki, Kunihiko Maezawa

SCI - Physics

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

25 Citations (Scopus)

Abstract

Ultralow-temperature neutron scattering experiments have been carried out in order to study the antiferromagnetic ordering in the heavy fermion superconductor UPt₃. We observed the (0.5 0 1) antiferromagnetic peak below 5 K. We found a finite spin correlation length of about 300 Å above 50 mK. The peak intensity increases linearly with decreasing temperature, and is suppressed below the superconducting transition temperature of about 0.56 K. The moment size of 0.04 _µB/U was estimated from the peak intensity. These behaviors are in full agreement with results of previous studies. Surprisingly, the antiferromagnetic peak exhibits considerable narrowing below 50 mK, and a resolution-limited peak is observed below 20 mK. This is direct evidence that the antiferromagnetic long-range ordering is realized in UPt₃ at ultralow temperatures.

Original language	English
Pages (from-to)	1142-1145
Number of pages	4
Journal	journal of the physical society of japan
Volume	67
Issue number	4
DOIs	https://doi.org/10.1143/JPSJ.67.1142
Publication status	Published - 1998

Keywords

UPt
antiferromagmetic ordering
heavy fermion superconductor
neutron scattering

ASJC Scopus subject areas

Physics and Astronomy(all)

Access to Document

10.1143/JPSJ.67.1142

Cite this

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title = "Long Range Antiferromagnetic Ordering Observed Below 20 mK in the Heavy Fermion Superconductor UPt3",

abstract = "Ultralow-temperature neutron scattering experiments have been carried out in order to study the antiferromagnetic ordering in the heavy fermion superconductor UPt3. We observed the (0.5 0 1) antiferromagnetic peak below 5 K. We found a finite spin correlation length of about 300 {\AA} above 50 mK. The peak intensity increases linearly with decreasing temperature, and is suppressed below the superconducting transition temperature of about 0.56 K. The moment size of 0.04 µB/U was estimated from the peak intensity. These behaviors are in full agreement with results of previous studies. Surprisingly, the antiferromagnetic peak exhibits considerable narrowing below 50 mK, and a resolution-limited peak is observed below 20 mK. This is direct evidence that the antiferromagnetic long-range ordering is realized in UPt3 at ultralow temperatures.",

keywords = "UPt, antiferromagmetic ordering, heavy fermion superconductor, neutron scattering",

author = "Yoshihiro Koike and Naoto Metoki and Etsuji Yamamoto and Yoshinori Haga and Yoshichika Ōnuki and Noriaki Kimura and Yoshichika Ōnuki and Kunihiko Maezawa",

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T1 - Long Range Antiferromagnetic Ordering Observed Below 20 mK in the Heavy Fermion Superconductor UPt3

AU - Koike, Yoshihiro

AU - Metoki, Naoto

AU - Yamamoto, Etsuji

AU - Haga, Yoshinori

AU - Ōnuki, Yoshichika

AU - Kimura, Noriaki

AU - Ōnuki, Yoshichika

AU - Maezawa, Kunihiko

PY - 1998

Y1 - 1998

N2 - Ultralow-temperature neutron scattering experiments have been carried out in order to study the antiferromagnetic ordering in the heavy fermion superconductor UPt3. We observed the (0.5 0 1) antiferromagnetic peak below 5 K. We found a finite spin correlation length of about 300 Å above 50 mK. The peak intensity increases linearly with decreasing temperature, and is suppressed below the superconducting transition temperature of about 0.56 K. The moment size of 0.04 µB/U was estimated from the peak intensity. These behaviors are in full agreement with results of previous studies. Surprisingly, the antiferromagnetic peak exhibits considerable narrowing below 50 mK, and a resolution-limited peak is observed below 20 mK. This is direct evidence that the antiferromagnetic long-range ordering is realized in UPt3 at ultralow temperatures.

AB - Ultralow-temperature neutron scattering experiments have been carried out in order to study the antiferromagnetic ordering in the heavy fermion superconductor UPt3. We observed the (0.5 0 1) antiferromagnetic peak below 5 K. We found a finite spin correlation length of about 300 Å above 50 mK. The peak intensity increases linearly with decreasing temperature, and is suppressed below the superconducting transition temperature of about 0.56 K. The moment size of 0.04 µB/U was estimated from the peak intensity. These behaviors are in full agreement with results of previous studies. Surprisingly, the antiferromagnetic peak exhibits considerable narrowing below 50 mK, and a resolution-limited peak is observed below 20 mK. This is direct evidence that the antiferromagnetic long-range ordering is realized in UPt3 at ultralow temperatures.

KW - UPt

KW - antiferromagmetic ordering

KW - heavy fermion superconductor

KW - neutron scattering

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