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Blumberg. G. Liu, R. Klein, M.V. Lee, W.C. Ginsberg, D.M. Gu, C. Veal, B.W. Dabrowski, B. 숙명여자대학교 자연과학연구소 1994 자연과학논문집 Vol.- No.5
We report observation and resonance Raman studies of spin-pair excitations in YBa₂Cu₃O6+n (0.37<x<0.7) and YBa₂Cu₃O6 superconductors. These excitations at energy ∼3J(2700±150cm-1), similar to two-magnon excitations in insulators, are evidence that antiferromagnetic fluctuations with spatial extent of at least three lattice constants are not overdamped in the underdoped superconductors. With optimal hole doping, where Tc>80 K, the two-magnon peak can no longer be seen above the flat Raman continuum. Photoluminescence and the orgin of the broad-spectrum Raman continuum are also discussed.
Blumberg. G.,Liu, R.,Klein, M.V.,Lee, W.C.,Ginsberg, D.M.,Gu, C.,Veal, B.W.,Dabrowski, B. 숙명여자대학교 자연과학연구소 1994 자연과학논문집 Vol.- No.5
We report observation and resonance Raman studies of spin-pair excitations in YBa₂Cu₃O6+n (0.37<x<0.7) and YBa₂Cu₃O6 superconductors. These excitations at energy ∼3J(2700±150cm-1), similar to two-magnon excitations in insulators, are evidence that antiferromagnetic fluctuations with spatial extent of at least three lattice constants are not overdamped in the underdoped superconductors. With optimal hole doping, where Tc>80 K, the two-magnon peak can no longer be seen above the flat Raman continuum. Photoluminescence and the orgin of the broad-spectrum Raman continuum are also discussed.
P. Nayek,S. Ghosh,S. Kundu,T. Pal Majumder,S.K. Roy,N. Bennis,J.M. Otón,R. Dabrowski 한국물리학회 2010 Current Applied Physics Vol.10 No.2
The electro-optical behavior of the orthoconic antiferroelectric liquid crystal mixture W-182 has been studied. Surface-stabilized, low thickness cells of this mixture give a perfect double hysteresis loop with 1 Hz triangular signal, reaching different transmission levels for different voltages amplitudes. These levels can be stabilized with a single holding voltage, making it possible for the material to be passively multiplexed at video rate. With the application of bias field at three different temperatures, we have observed the field-induced Fréedericksz transition from SmI*A–SmC*A, antiferroelectric to ferroelectric, and ferroelectric to paraelectric transition. Such Fréedericksz transition point is decreased with the increase of temperature.