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Suhk Kun Oh 한국물리학회 2016 New Physics: Sae Mulli Vol.66 No.5
The time evolution of classical van der Waals spins in the presence of a heat bath consisting of a chain of one-dimensional classical harmonic oscillators, with the coupling term $ - S_z^2 \sum c_k x_k$, was studied. The exact harmonic oscillator bath variables, the averages of the total spin components, were obtained, and the relaxation behaviors of the total spin components in the system were examined. The bath variables averages of the x- and the y-components of the total spin showed no amplitude relaxation, but an interesting phase-angle relaxation was observed. The phase angles of the x- and the y-components of the total spin showed a transient, damped, oscillating behavior before settling to a steady increase with time; however, the z-component of the total spin remained constant.
Suhk Kun Oh 한국물리학회 2016 새물리 Vol.66 No.5
The nonequilibrium relaxation behaviors of noninteracting classical spins in a longitudinal magnetic field coupled to D(=1,2,3)-dimensional Debye heat baths were studied to see whether the dimensionality of the Debye heat baths significantly affected their behaviors. For the case of a one-dimensional Debye heat bath, the relaxation of the classical spins was manifested as a phase-angle relaxation in a manner almost identical to that of the heat bath consisting of a one-dimensional chain of classical harmonic oscillators. Nevertheless, for the cases of two- and three-dimensional Debye heat baths coupled to the classical spins, discontinuities in the phase-angle relaxation of the total spin components suddenly occured at time $t=0$.
Nanto, Dwi,Seong-Cho Yu,Suhk-Kun Oh,Chebotaev, Nikolay,Telegin, Andrey IEEE 2014 IEEE transactions on magnetics Vol.50 No.4
<P>Manganite perovskite with A-site deficiency has been synthesized by a solid-state reaction technique. Our work does not support a general view that A-site deficiency gives a decrease on Curie temperature. The Curie temperature of (La<SUB>0.8</SUB>Ca<SUB>0.2</SUB>)<SUB>0.975</SUB>MnO<SUB>3.01</SUB> is 188 K with maximum entropy change -ΔSM <SUB>max</SUB> = 1.6 J·kg<SUP>-1</SUP>·K<SUP>-1</SUP> and refrigerant capacity (RC) of 27 J/kg under an applied field of 10 kOe. The nonstoichiometric (La<SUB>0.8</SUB>Ca<SUB>0.2</SUB>)<SUB>0.975</SUB>MnO<SUB>3.01</SUB> may offer a wider temperature span of ~240% compared with those nanocrystalline La<SUB>0.8</SUB>Ca<SUB>0.2</SUB>MnO<SUB>3.01</SUB> that have similar RC, which has been reported by others.</P>