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Effects of pressure on spin fluctuations and the exchange interaction in La,Cu04 as determined by two-magnon Raman scattering (abstract)
 

Summary: Effects of pressure on spin fluctuations and the exchange interaction in
La,Cu04 as determined by two-magnon Raman scattering (abstract)
S. B. Dierker and M. C. Aronson
Randall Laboratory, Department of Physics, University of Michigan, Ann Arbor, Michigan 48109
B. S. Dennis and S.-W. Cheong
A. T.&YiY Bell Laboratories, Murray Hill, New Jersey 07974
Z. Fisk
Los Alamos National Laboratory, Los Alamos, New Mexico 87545
We have measured the two-magnon Raman scattering spectrum of magnetic La2Cu04 at
pressures of up to 100 kbar. Analysis of the moments of the two-magnon line shape indicates
that the renormalization parameters resulting from spin fluctuations are essentially
pressure independent in this pressure range. Our results provide the first direct determination
of the pressure dependence of the m-plane exchange coupling constant J. The pressure
dependence of J is compared with that of the Neel temperature and discussed in the context
of recent theories for quasi-two-dimensional magnetic systems.
Work performed while S. B. Dierker was a Member of Technical Staff at
A.T.&T. Bell Laboratories and M. C. Aronson a Postdoctoral Research
Assistant at Los Alamos National Laboratory.
5392 J. Appl. Phys. 69 (8), 15 April 1991 0021-8979/91/085392-01$03.00 @ 1991 American Institute of Physics 5392
Downloaded 07 Feb 2004 to 141.211.175.139. Redistribution subject to AIP license or copyright, see http://jap.aip.org/jap/copyright.jsp

  

Source: Aronson, Meigan - Department of Physics and Astronomy, SUNY at Stony Brook

 

Collections: Materials Science; Physics