## Abstract

The uniform spin susceptibility χ around the quantum critical point is discussed on the basis of the mode-mode coupling theory of the antiferromagnetic (AF) spin fluctuations. The temperature dependence of χ around the quantum critical point reflects the magnetic-field dependence of the free energy due to that of the spin fluctuations. The results are χ ∝ 1 - β_{2}t^{1/4} for the conventional class of AF fluctuations with the dynamical exponent z = 2, and χ ∝ 1 - β_{3}t^{1/3} for a new class of AF fluctuations with z = 3, where t is the reduced temperature and β_{2} and β_{3} are numerical constants. For Ce_{7}Ni_{3}, the behavior of χ around the quantum critical point is possibly explaned by this theory with the conventional class of AF fluctuations with z = 2. The latter type of AF fluctuations with z = 3 is possible when the system contains even number of magnetic ions in the unit cell such as CeCu_{6-x}Aux (x = 0.1), because the AF ordering vector can coincide with one of the reciprocal lattice vectors.

Original language | English |
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Pages (from-to) | 4002-4005 |

Number of pages | 4 |

Journal | journal of the physical society of japan |

Volume | 67 |

Issue number | 12 |

DOIs | |

Publication status | Published - 1998 |

Externally published | Yes |

## All Science Journal Classification (ASJC) codes

- General Physics and Astronomy