Mean-field type Ising spin glass in a diluted rare-earth intermetallic compound

Abstract

We have investigated a phase transition of a long-range RKKY Ising spin glass \dyyrusi by means of the dc and the ac magnetization measurements. The static nonlinear susceptibility ${\chi }_2$ exhibits a divergent behavior toward $\Tg$ $=$ 1.925 K with the exponent of $\gamma$ $=$ 1.08. The characteristic relaxation time $\tau$ obtained from the ac magnetization measurements also diverges to the same $\Tg$ with the exponent of $z\nu$ $=$ 1.9 in zero static field . These results indicate the spin glass phase transition belonging to the mean-field universality class, in which the exponents of $\gammaMF$ and $\znuMF$ are 1 and 2 respectively. Moreover, we observed the divergence of $\tau$ in a finite field of 500 Oe toward $\Tg$ $=$ 1.412 K with the exponent of $z\nu$ $=$ 2.1, being quite similar to that in zero field. It strongly suggests an existence of the spin glass phase transition in a finite field and the replica symmetry breaking (RSB) in the long-range Ising spin glass \dyyrusi.

4 pages, 3 figures, to be published in J. Phys.: Conference Series (ICM2009)

References in corpus (3)

• Absence of an Almeida-Thouless line in Three-Dimensional Spin Glasses
• Diluted one-dimensional spin glasses with power law decaying interactions
• Scaling Analysis of Domain-Wall Free-Energy in the Edwards-Anderson Ising Spin Glass in a Magnetic Field

Cited by in corpus (1)

• The Ising M-p-spin mean-field model for the structural glass: continuous vs. discontinuous transition