S=1/2 One‐Dimensional Random‐Exchange Ferromagnetic Zigzag Ladder,Which Exhibits Competing Interactions in a Critical Regime |
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| Authors: | Susan N. Herringer Dr. Mercè Deumal Dr. Jordi Ribas‐Arino Prof. Juan J. Novoa Prof. Christopher P. Landee Prof. Jan L. Wikaira Prof. Mark M. Turnbull |
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| Affiliation: | 1. Carlson School of Chemistry and Biochemistry, Clark Universitym, 950 Main St. Worcester, MA 01610 (USA), Fax: (+1)?508‐793‐7117;2. Departament de Química Física and IQTCUB, Universitat de Barcelona, Av. Diagonal 645, 08028, Barcelona (Spain);3. Department of Physics, Clark University, 950 Main St. Worcester, MA 01610 (USA);4. Department of Chemistry, University of Canterbury, Private Bag 4800, Christchurch (New Zealand) |
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| Abstract: | The synthesis, crystal structure, and magnetic properties (from a combined experimental and First‐Principles Bottom‐Up theoretical study) of the new compound catena‐dichloro(2‐Cl‐3Mpy)copper(II), 1 , [2‐Cl‐3Mpy=2‐chloro‐3‐methylpyridine] are described and rationalized. Crystals of 1 present well isolated magnetic 1D chains (no 3D order was experimentally observed down to 1.8 K) and magnetic frustration stemming from competing ferromagnetic nearest‐neighbor (JNN) interactions and antiferromagnetic next‐nearest neighbor (JNNN) interactions, in which α=JNNN/JNN JNN magnetic interactions can randomly take one of the following three values: 53, 36, and 16 cm?1. The structural disorder does not affect the JNNN value, which in all cases is approximately ?9 cm?1. A proper statistical treatment of this disorder provides a computed magnetic susceptibility curve that reproduces the main features of the experimental data. |
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| Keywords: | coordination polymers density functional calculations exchange interactions random structural disorder spin frustration |
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