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2차원 액체 ⁴He 내의 ³He 희석액에서 ³He 원자들의 유효상호작용
채건식,설정식,전철원 경남대학교 신소재연구소 1997 論文集 Vol.9 No.-
2차원 액체 ⁴He내에서 ³He 원자들 d사이의 유효상호작용이 고찰된다. 평균유효퍼텐셜과 화학퍼텐셜의 비는 ³He 농도에 독립으로 나타난다. 또한 ³He 준입자의 유효질량이 1+1/2F₁^(s)로 주어지고 매개변수 F₁^(s)가 ³He 농도의 함수로서 얻어진다. The effective interaction between ^{3}He atoms in two-dimensional liquid ^{4}He is investigated. It is shown that the ratio of the average effective potential to the chemical potential is independent of the 3He concentration. Also, the effective mass of the ^{3}He quasiparticle is given by 1+1/2F_{1}^{s} and the parameter F_{1}^{s} is obtained as a function of the ^{3}He concentration.
Bi₂Sr₂Ca₁Cu₂O8+δ단결정의 전기저항과 전송메카니즘에 대한 연구
설정식,손인호,채건식,주유환 慶南大學校 附設 基礎科學硏究所 1998 硏究論文集 Vol.12 No.-
In this work, we have used Aslamasov-Larkin(AL) theory for analyzing the resistive and electrical mechanism of as-grown and 8 hour O₂annealed Bi₂Sr₂Ca₁Cu₂O8+δ samples. Tc is 89K for as-grown sample and 83K for annealed sample. By fluctuation conductivity using AL theory. we have examined that as-grown sample had 3D transition in the wide critical region than for the annealed sample.
극저온 3차원 초유체 ⁴He내에서 열점성파에 관한 연구
채건식,손인호,설정식,전철원 慶南大學校 附設 基礎科學硏究所 1999 硏究論文集 Vol.13 No.-
The velocity of thermoviscous wave in three-dimensional superfluid ⁴He is evaluated explicitly by solving superfluid hydrodynamic equations at very low temperatures and in the low -frequency limit. The velocity of this wave is connected with the thermal conductivity and the coefficient of first viscosity.
개선된 Bridgman법으로 성장한 Bi₂Sr₂CaCu₂O_(8+δ) 單結晶의 초전도성
채건식,손인호,설정식,이수대,김영국,전동성,오재근,강성욱 경남대학교 환경문제연구소 1995 환경연구 Vol.17 No.-
The Bi₂Sr₂CaCu₂O_(8)+_(δ) single crystals are grown from the melt using a stoichiometric starting composition fer the cautions. The size and thickness of the Bi₂Sr₂CaCu₂O_(8)+_(δ) crystals depends on the cooling rate. The lower the cooling rate, the bigger and thicker the Bi₂Sr₂CaCu₂O_(8)+_(δ) crystals become. Bi₂Sr₂CaCu₂O_(8)+_(δ) X-ray diffraction(XRD) measurements of the single crystals were carried out using the radiation source of Cu Kα . In these Patterns only the (0,0,2n) diffraction appeared. The result indicated that the cleared surface of the single crystal was of the a-b face, and that the single crystal had a single phase without any undergrowth with 7K and 85K phases. In addition, although the figure is not shown, XRD patterns from (006) to (00□) were observed in the range of 2θ=0 to 60 degrees. The characterization of as-grown single crystals have been analyzed by Laue X-ray backsdattering along the c-axis and X-ray precession experiments. The result of magnetic moment vs Tc in 10 Gauss for a crystals were measurements indicated that the samples have a superconducting transition temperature of 85K.
Bi₂Sr₂Ca₁(Cu₁-xFex)₂O8+δ (x=0, 0.003, 0.006, 0.009) 단결정의 전기적 이방성의 어닐링효과에 대한 연구
설정식,손인호,채건식,최기영 慶南大學校 附設 基礎科學硏究所 1998 硏究論文集 Vol.12 No.-
The annealing effect of Bi₂Sr₂Ca₁(Cu₁-xFex)₂O8+δ (x=0, 0.003, 0.006, 0.009) single crystal have been studied. The single crystal was grown in air by developed directional solidification method and subsequently annealed for 8 hours at 700℃. The structure of grown singel crystal is measured through X-ray diffraction measurement. We measured resistivity by standard four probe method in the range of temperature from 20 K to 250 K. As the quantity of Fe is increased from x=0 to x=0.009. Tc is decreased from 89 K to 77 K. Tc of annealed samples are smaller than that of as-grown sample.
채건식,전철원,설정식 경남대학교 신소재연구소 1997 論文集 Vol.9 No.-
회전 초유체 ⁴Heso에서 중심에서 벗어난 양자소용돌이의 유체역학적 움직임이 소멸계수들과 열역학을 포함하는 초유체 유체역학 방정식을 사용하므로서 고찰된다. 평형상태로의 완화를 나타내는 시간상수에 대한 3-포논과정의 기여가 온도의 함수로서 계산되며 T의존을 가지는 것으로 나타난다. The hydrodynamic behavior of an off-center quantized vortex in rotating superfluid ^{4}He is investigated by using the superfluid hydrodynamic equation including dissipation coefficients and the thermodynamics. The contribution of three-phonon processes to the time constant that governs the relaxation to the equilibrium state is evaluated as a function of temperature, and is shown to have a T dependence.