Extended quantum critical phase in a magnetized spin-1/2 antiferromagnetic chain.

Stone, M B; Reich, D H; Broholm, C; Lefmann, K; Rischel, C; Landee, C P; Turnbull, M M

Stone, M B; Reich, D H; Broholm, C; Lefmann, K; Rischel, C; Landee, C P; Turnbull, M M.

Afiliación

Stone MB; Department of Physics and Astronomy, Johns Hopkins University, Baltimore, Maryland 21218, USA.

Phys Rev Lett ; 91(3): 037205, 2003 Jul 18.

Article en En | MEDLINE | ID: mdl-12906448

RESUMEN

Measurements are reported of the magnetic field dependence of excitations in the quantum critical state of the spin S=1/2 linear chain Heisenberg antiferromagnet copper pyrazine dinitrate (CuPzN). The complete spectrum was measured at k(B)T/J< or =0.025 for H=0 and H=8.7 T, where the system is approximately 30% magnetized. At H=0, the results are in agreement with exact calculations of the dynamic spin correlation function for a two-spinon continuum. At H=8.7 T, there are multiple overlapping continua with incommensurate soft modes. The boundaries of these continua confirm long-standing predictions, and the intensities are consistent with exact diagonalization and Bethe ansatz calculations.

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Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Phys Rev Lett Año: 2003 Tipo del documento: Article País de afiliación: Estados Unidos Pais de publicación: Estados Unidos

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