MAGNETIC EXCITATIONS AND DOUBLE GAP IN THE S=1/2 LINEAR CHAIN QUANTUM ANTIFERROMAGNET BaCu{sub 2}Si{sub 2}O{sub 7}

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The magnetic excitation spectrum of the ideal S=1/2 1-dimensional quantum antiferromagnet (AF), contains no single-mode contributions, and, in fact, can be described as a 2-particle continuum of spinons. Chain-MF theory predicts that a weakly coupled chains system becomes ordered at low temperatures. In the ordered state a sharp magnon excitation is present. The continuum persists, but is separated from the magnon branch by an appreciable energy gap. On the other hand, if weakly coupled chains are described through the 1/S expansion of the conventional Holstein-Primakov spin wave theory, one finds a longitudinal 2-magnon continuum and a transverse 3-magnon continuum that ... continued below

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2 pages

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RAYMOND,S.; ZHELUDEV,A.; MASUDA,T.; KAKURAI,K.; RESSOUCHE,E. & WILDES,A. March 16, 2000.

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Description

The magnetic excitation spectrum of the ideal S=1/2 1-dimensional quantum antiferromagnet (AF), contains no single-mode contributions, and, in fact, can be described as a 2-particle continuum of spinons. Chain-MF theory predicts that a weakly coupled chains system becomes ordered at low temperatures. In the ordered state a sharp magnon excitation is present. The continuum persists, but is separated from the magnon branch by an appreciable energy gap. On the other hand, if weakly coupled chains are described through the 1/S expansion of the conventional Holstein-Primakov spin wave theory, one finds a longitudinal 2-magnon continuum and a transverse 3-magnon continuum that start immediately above the spin wave energy.

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2 pages

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OSTI as DE00759036

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  • Other Information: The dates of this experiment were 11/10/1999--11/17/1999

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  • Report No.: BNL--67296
  • Report No.: KC020201
  • Grant Number: AC02-98CH10886
  • DOI: 10.2172/759036 | External Link
  • Office of Scientific & Technical Information Report Number: 759036
  • Archival Resource Key: ark:/67531/metadc703125

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  • March 16, 2000

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  • Sept. 12, 2015, 6:31 a.m.

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  • Nov. 9, 2015, 8:08 p.m.

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RAYMOND,S.; ZHELUDEV,A.; MASUDA,T.; KAKURAI,K.; RESSOUCHE,E. & WILDES,A. MAGNETIC EXCITATIONS AND DOUBLE GAP IN THE S=1/2 LINEAR CHAIN QUANTUM ANTIFERROMAGNET BaCu{sub 2}Si{sub 2}O{sub 7}, report, March 16, 2000; Upton, New York. (digital.library.unt.edu/ark:/67531/metadc703125/: accessed October 18, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.