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Electronic Raman scattering in cuprate superconductors and parent insulating phases
Klein, M.V.,Salamon, D.,Blumberg, G.,Cooper, S.L.,Ginsberg, D.M.,Liu, R.,Reznik, D.,Lee, W.C. 숙명여자대학교 자연과학연구소 1994 자연과학논문집 Vol.- No.5
Raman scattering from charge and spin excitations in cuprates is reviewed. The two-magnon resonance Raman profile is used to determine the most probable energy for photon-assisted charge transfer leading to exchange between two spins. The difference between this energy and that for absorption is attributed to spin relaxation (spin polaron) effects. Two-magnon spectra in superconducting cuprates are presented. It is argued that their presence is evidence that the antiferromagnetic correlation length is equal to or greater than three lattice constants. The recently-discovered Raman-active excitons are described and possible assignments of them are discussed. It is pointed out that in highly correlated metals and insulators, the mechanisms for light scattering that are familiar for doped semiconductors or conventional metals are not necessarily the only ones that are operative.
Klein, M.V.,Liu, Ran,Salamon, D.,Cooper, S.L.,Lee, W.C.,Ginsberg, D.M.,Cheong, S.-W. 숙명여자대학교 자연과학연구소 1994 자연과학논문집 Vol.- No.5
Optical absorption at the insulating gap in the parent phase of cuprate superconductors shows a broad exciton-like peak near 1.7 eV, followed by a gradual decrease in absorption persisting 1 eV above the gap. By using ultraviolet laser lines to excite Raman spectra, we have found a Raman peak 0.2 eV below the first absorption peak in insulating cuprates. The Raman peak is much narrower than the absorption peak and has A symmetry. We assign it to an exciton consisting of a hole transition from Cu dx²-y to a linear combination of Cu dxy and nearest neighbor O P orbitals. We have also studied the resonance Raman profile for two-magnon Raman scattering in the same samples. We find a sharp resonance feature at about 2.7 eV, and little Raman intensity for photon energies at the 1.7 eV absorption peak. The state created at the peak must therefore be an inappropriate intermediate state for the double spin-flip Raman process.
Electronic Raman scattering in cuprate superconductors and parent insulating phases
Klein, M.V.,Salamon, D.,Blumberg, G.,Cooper, S.L.,Ginsberg, D.M.,Liu, R.,Reznik, D.,Lee, W.C. 숙명여자대학교 자연과학연구소 1994 자연과학논문집 Vol.- No.5
Raman scattering from charge and spin excitations in cuprates is reviewed. The two-magnon resonance Raman profile is used to determine the most probable energy for photon-assisted charge transfer leading to exchange between two spins. The difference between this energy and that for absorption is attributed to spin relaxation (spin polaron) effects. Two-magnon spectra in superconducting cuprates are presented. It is argued that their presence is evidence that the antiferromagnetic correlation length is equal to or greater than three lattice constants. The recently-discovered Raman-active excitons are described and possible assignments of them are discussed. It is pointed out that in highly correlated metals and insulators, the mechanisms for light scattering that are familiar for doped semiconductors or conventional metals are not necessarily the only ones that are operative.
Klein, M.V.,Liu, Ran,Salamon, D.,Cooper, S.L.,Lee, W.C.,Ginsberg, D.M.,Cheong, S.-W. 숙명여자대학교 자연과학연구소 1994 자연과학논문집 Vol.- No.5
Optical absorption at the insulating gap in the parent phase of cuprate superconductors shows a broad exciton-like peak near 1.7 eV, followed by a gradual decrease in absorption persisting 1 eV above the gap. By using ultraviolet laser lines to excite Raman spectra, we have found a Raman peak 0.2 eV below the first absorption peak in insulating cuprates. The Raman peak is much narrower than the absorption peak and has A symmetry. We assign it to an exciton consisting of a hole transition from Cu dx²-y to a linear combination of Cu dxy and nearest neighbor O P orbitals. We have also studied the resonance Raman profile for two-magnon Raman scattering in the same samples. We find a sharp resonance feature at about 2.7 eV, and little Raman intensity for photon energies at the 1.7 eV absorption peak. The state created at the peak must therefore be an inappropriate intermediate state for the double spin-flip Raman process.
Klein, Melanie 圓光大學校 醫科大學 神經精神科學敎室 1998 圓光精神醫學 Vol.14 No.2
앞서의 나의 논문들은, 어린이가 생후 1년동안 경험하는, 가학(sadism) 시기의 정점을 설명하였다. 태어나서 한달 동안, 어머니의 젖가슴뿐만 아니라, 어머니의 몸내부에 대해서도, 가학적인 충동을 갖는다 : 퍼내고, 먹어치우고, 가학증이 제시하는 모든 방법을 동원하여 파괴함. 유아의 발달은 함입(introjection)과 투사(projection)의 기전이 지배한다. 처음부터 자아는 대상들을 '좋은 것'과 '나쁜 것'으로 구분하는데, 모두 다 어머니의 젖가슴이 근본이다 - 젖가슴이 만족을 주면 좋은 것, 실망을 주면 나쁜 것이 된다. 어린이가 젖가슴을 '나쁜 것'으로 느끼는 것은, 젖가슴이 어린이의 욕구를 좌절시키기 때문만은 아니고, 어린이가 자신의 공격심을 젖가슴에 투사하기 때문이기도 하다: 어린이는 젖가슴을 실제로 위험한 가해자로 받아들이는데, 젖가슴이 자신을 먹어치우고, 자신의 몸 내부를 파내고, 모든 가학적인 수단을 동원하여 자신을 파괴시키려고 한다. 이러한 상들은 현실적인 대상들을 환상에서 왜곡시킨 것인데, 외부 세계뿐만 아니라, 함입에 의해, 자아에도 생기게 된다. 따라서 아주 어린 애들이 불안 상황을 경험하게 되는데 (방어기제를 사용하여 반응한다), 그 내용은 성인의 정신증의 상황과 비슷하다.