Submillimeter-wave ESR measurements of low-dimensional quantum spin systems |
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| Authors: | H Ohta S Okubo S Kimura T Sakurai S Takeda T Tanaka H Kikuchi H Nagasawa |
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| Institution: | (1) Graduate School of Science, Kobe University, Rokko, Kobe 657-8501, Japan;(2) Molecular Photoscience Research Center, Kobe University, Rokko, Kobe 657-8501, Japan;(3) Center for Supports to Research and Education Activities, Kobe University, Rokko, Kobe 657-8501, Japan;(4) Department of Applied Physics, University of Fukui, Bunkyo, Fukui 910-8507, Japan;(5) Headquarters for Advancement of High Priority Research, University of Fukui, Bunkyo, Fukui 910-8507, Japan |
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| Abstract: | Temperature-dependent electron spin resonance (ESR) measurements of two low-dimensional quantum spin systems, theS = 1/2 spin-ladder system Cu2(1,4-diazacycloheptane)2Cl4 (Cu2(C5H12N2)2Cl4) and the gaplessS = 1 bond-alternating one-dimensional antiferromagnettrans-Ni(333-tet)(N3)(ClO4), have been performed. X-band electron spin resonance (ESR) measurements of single-crystal Cu2(C5H12N2)2Cl4 show the increase of linewidth and anisotropicg-shifts below 8 K similar to those known for one-dimensional antiferromagnet. On the other hand, Ni(333-tet)(N3)(ClO4) has broad line-width and ESR has been observed for the first time by our high-field ESR. Its linewidth increases as the
temperature is decreased, while theg-shift seems to be isotropic and theg-value decreases as the temperature is decreased. Thisg-shift can be connected to the quantum fluctuation of the system. |
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