Formation of Alternating Antiferromagnetic Heisenberg Chains in (CH_3)_2CHNH_3CuBr_3
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概要
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We report that antiferrornagnetic and antif'errornagnetic (AF-AF) alternating Heisenbergchains with S z 172 are fornued in (CHa)xCHNHaCuBra, which is in contrast to the almostisounorphotrs compotrnd (CH3)zCHNH3CuCl3, because the Cl cortapound forms ferroznagnetic-dorninant ferrornagnetic and antiferrotnagnetic (F-AF) alternating Heisenberg chains [H. Manakaet at.: J. Phys. Soc, Jpn, 66 (1997) 5644. From the analysis of the dependence of magneticstusceptibility on terrmperature, ((T), the two different ?rntiferrornagnetic exchange interactionsdefined in the Hatniltonian 1-t = -2J3 I Szj - Szj;) - 2,72 I Szj - S7j l are determined to beJc /k : -61 K and Jw /k : -33 K. Applying the low teunperattrre experimental data to theformtrla ((']) CK T "' exp( -A/kT), we estirnate the energy gap A to be 98 K. We discuss whyAF-AF and F-AF alternating chains are formed in the Br and the Cl cornpounds, respectively,in spite of their almost isoraaorphotrs crystal structures.
- 社団法人日本物理学会の論文
- 1997-07-15
著者
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Yamada Isao
Department Of Communications And Integrated Systems Tokyo Institute Of Technology
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Manaka Hirotaka
Department Of Cardiology The Heart Institute Of Japan Tokyo Women's Medical University
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Manaka Hirotaka
Department Of Physics Faculty Of Science Chiba University
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Yamada Isao
Departmen Of Communications And Integrated Systems Tokyo Institute Of Technology
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