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RISS 인기검색어
- 검색키워드
- 주제어 : hexagonal ReMnO3 (검색결과 2 건)
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Development of the precise dilatometer and study of spin lattice coupling of doped (Y,Lu)MnO3
최성일 성균관대학교 일반대학원 2017 국내박사
Multiferroic refers to multifunctional materials that simultaneously possesses two or more ferroic orders like ferromagnetism, ferroelectricity, and /or ferroelasticity. Hexagonal ReMnO3 is one of multiferroic compounds, which have giant spin–lattice coupling at an antiferromagnetic transition temperature. Despite extensive studies over the past two decades, the origin and underlying microscopic mechanism of strong spin–lattice coupling remain very much elusive. In this study, I developed a precise capacitive dilatometer. I carried out the whole processes and finally I obtained Å level of resolution. Here I describe the whole developmet story; design, assembly, test, calibration, and calculation. Through the development of the dilatom11eter, I went through a lot of trial and error, which finally made me understand the principle, physics, and precise experiment. I try to address the multiferroic mechanism of Hexagonal manganites by measuring the thermal expansion of doped single crystals Y1−xLuxMnO3 where x = 0, 0.25, 0.5, 0.75, and 1.0 with my dilatometer. From these measurements, we confirm that there is a progressive change in the physical properties with doping. At the same time, all our samples exhibit clear anomalies at TN, even in the samples where x = 0.5 and 0.75. This is opposed to some earlier ideas, which suggests an unusual doping dependence of the anomaly. Our work reveals yet another interesting facet of the spin–lattice coupling issue in hexagonal RMnO3. Keywords : dilatometer, multiferroic, hexagonal ReMnO3, spin-lattice coupling
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