Understanding far-infrared absorption in the S=1 antiferromagnetic chain compound NENP

Mitra, P. P., Halperin, B. I. (1994) Understanding far-infrared absorption in the S=1 antiferromagnetic chain compound NENP. Physical Review Letters, 72 (6). pp. 912-915. ISSN 00319007 (ISSN)

URL: https://www.ncbi.nlm.nih.gov/pubmed/10056566
DOI: 10.1103/PhysRevLett.72.912

Abstract

Infrared transmission measurements on the S=1 antiferromagnetic chain compound NENP [Ni(C2H8N2)2NO2ClO4] in applied magnetic fields show a sharp absorption line at the field-shifted Haldane gap. This violates a wave-vector selection rule of the Hamiltonian normally used for NENP, as the gap excitations occur at the Brillouin zone boundary. We argue that the crystal structure admits terms which can explain the absorption lines. The observation of a finite gap at all applied fields can be explained by the presence of an induced staggered magnetic field, originally proposed by Chiba et al. © 1994 The American Physical Society.

Item Type: Paper
Subjects: Investigative techniques and equipment > magnetic resonance imaging
physics
CSHL Authors:
Communities: CSHL labs > Mitra lab
Depositing User: CSHL Librarian
Date: 1994
Date Deposited: 02 Apr 2012 20:09
Last Modified: 10 Feb 2017 20:41
Related URLs:
URI: http://repository.cshl.edu/id/eprint/25854

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