Ac Susceptibility and Static Magnetization Measurements of   CeRu$_2$Si$_2$ at Small Magnetic Fields and Ultra Low Temperatures

D. Takahashi (1); S. Abe (1); H. Mizuno (1); D. A. Tayurskii (1 and; 2); K. Matsumoto (1); H. Suzuki (1); Y. \'Onuki (3) ((1)Department of; Physics; Kanazawa University; (2)Physics Department; Kazan State University,; (3)Graduate School of Science; Osaka University)

arXiv:cond-mat/0212238·cond-mat.str-el·August 16, 2016

Ac Susceptibility and Static Magnetization Measurements of CeRu$_2$Si$_2$ at Small Magnetic Fields and Ultra Low Temperatures

D. Takahashi (1), S. Abe (1), H. Mizuno (1), D. A. Tayurskii (1 and, 2), K. Matsumoto (1), H. Suzuki (1), Y. \'Onuki (3) ((1)Department of, Physics, Kanazawa University, (2)Physics Department, Kazan State University,, (3)Graduate School of Science, Osaka University)

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TL;DR

This study explores the magnetic properties of CeRu$_2$Si$_2$ at ultra-low temperatures and small magnetic fields, revealing no magnetic order or superconductivity, suggesting proximity to a quantum critical point.

Contribution

First experimental investigation of CeRu$_2$Si$_2$'s magnetic behavior at microkelvin temperatures and ultra-small fields, indicating its closeness to a quantum critical point without doping.

Findings

01

No evidence of magnetic ordering or superconductivity down to 170 μK.

02

Magnetic transition temperature is very close to absolute zero.

03

CeRu$_2$Si$_2$ may be near a quantum critical point without doping.

Abstract

The magnetic properties of CeRu $_{2}$ Si $_{2}$ at microkelvin temperatures (down to 170 $μ$ K) and ultra small magnetic fields ( $0.02 \sim 6.21$ mT) are investigated experimentally for the first time. The simultaneously measured ac susceptibility and static magnetization show neither evidence of the magnetic ordering, superconductivity down to the lowest temperatures nor conventional Landau Fermi-Liquid behavior. The results imply the magnetic transition temperature in undoped CeRu $_{2}$ Si $_{2}$ is very close to absolute 0 K. The possibility for proximity of CeRu $_{2}$ Si $_{2}$ to the quantum critical point without any doping is discussed.

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