Ground States of Double Spin Chain Systems TlCuCl_3,NH_4CuCl_3 and CuBr_3
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概要
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The rnagnetic susceptibilities of S : 1/2 double spin chain systems, TlCuCl3, NH,jCuCI3 andKCLlBI3, which are isomorphotrs with KCL1Cl3 have been treasured trsing single crystals andpolycrystals. The exchange interactions in a dovrble chain can be described by a Heisenbergspin ladder with an additional diagonal interaction. It is found for TlCuCI3 and KCuBr3 thatwith decreasing ternperattmre the susceptibilities for different external field directions exhibitbroad maxima at 38 K and 130 K, respectively, and decrease exponentially to zero as observedin KCuCl3. This restrlt indicates that their ground state is a spin singlet with an excitation gap.This behavior is attributed to the quantturaa effect characteristic of the spin ladder systeun. ForNH4CL1CI3, the susceptibility of polycrystals displays a rotund maxiunurn at 4.5K and decreaseswith a tendency toward zero, which implies the nonrnagnetic ground state.
- 1997-06-15
著者
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Kato T
Fukuoka Institute Of Technology
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TAKATSU Ken-ichi
Department of Physics,Tohoku Institute for Technology
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Shiramura Wakako
Department Of Physics Faculty Of Science And Technology Sophia University
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KATO Tetsuya
Faculty of Education, Chiba University
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Kato T
Faculty Of Education Chiba University
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Tanaka Hidekazu
Department Of Internal Medicine Iii Osaka Medical College
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Tanaka Hidekazu
Department Of Earth And Planetary Sciences Faculty Of Science Tokyo Institute Of Technology
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Tanaka Hidekazu
Department Of Chemistry And Chemical Biology Gunma University
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