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- 저자 : Masami Ikeda (검색결과 3 건)
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Multi-frequency ESR in EuFe2As2
Masami Ikeda,Masayuki Hagiwara,Tatsuya Kobayashi,Wataru Hirata,Shigeki Miyasaka,Setsuko Tajima 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.12
We have performed multi-frequency electron spin resonance (ESR) measurements on EuFe2As2,which is one of the parent compounds of Fe-based superconductors. At TSDW=190 K, this compoundshows a spin-density-wave (SDW) transition. At temperatures above TSDW, the relaxationof Eu2+ spins takes place via the coupling of conduction electrons, resulting in a Korringa-type increasein the linewidth. At temperatures below TSDW, however, this compound shows an anisotropictemperature-independent linewidth except at temperatures near the long-range ordering temperature(19 K) of Eu2+ spins, giving evidence for a gap opening at TSDW. This change of physicalproperties indicates a change in the exchange interaction between localized Eu2+ spins and conductionelectrons in the FeAs layers. We evaluate the exchange constant, which was not reported inprevious X-band ESR studies, and compare it with the value for another Eu metallic compound.
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High-field Multi-frequency ESR in the S=2 Heisenberg Antiferromagnetic Chain Compound MnCl3(bpy)
Masayuki Hagiwara,Masami Ikeda,Yuichi Idutsu,Shojiro Kimura,Zentaro Honda 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.12
We report the results of high-field multi-frequency electron spin resonance (ESR) experimentson a powder sample of MnCl3 (bpy) (bpy=2, 2’-bipyridine). This compound is one of the rareexamples of the spin (S) 2 quasi one-dimensional (1D) Heisenberg antiferromagnets (HAFs), andmagnetic properties of tiny single crystal samples were reported previously (G. E. Granroth et al.,Phys. Rev. Lett. 77, 1616 (1996).). In our previous paper on this compound (M. Hagiwara et al.,J. Phys.: Conf. Ser. 400, 032014 (2012).), we reported, for the S=2 1D HAF, good agreementbetween experiment and calculation for the temperature dependence of magnetic susceptibility andthe high-field magnetization process at 1.3 K. In this work, we have observed some high-frequencyresonance modes with zero-field gaps of about 800 GHz that may correspond to antiferromagneticresonance modes with orthorhombic anisotropy in a long-range-ordered phase that emerged at lowtemperatures above the critical field at which the energy gap (Haldane gap) closes. The single-ionanisotropy constant D evaluated from the analysis of these ESR modes is larger than that reportedpreviously.
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Yibo Han,Takanori Kida,Masami Ikeda,Masayuki Hagiwara,Jozef Streˇcka,Zentaro Honda 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.12
A powder and field-aligned samples of the 3d-4f bimetallic polymeric chain[Dy(NO3)(DMSO)2Cu(opba)(DMSO)2, DMSO: Dimethyl-sulfoxide, opba: ortho-phenylenebis(oxalato)] built from alternating dysprosium(3+) and copper(2+) ions are magnetic investigatedin detail. The magnetic alignment for the powder is successful indicated by the remarkablemagnetic anisotropy at low temperature. The high-field magnetization of the powder sample wasmeasured at the temperatures down to 1.3 K and in magnetic fields up to 52 T. The high-fieldmagnetization of the powder sample is in reasonably accordance with theoretical predictions for aspin-1/2 chain of alternating Ising and Heisenberg spins. The present study thus provides the firsthigh-field investigation of a new type of Ising-Heisenberg spin alternating chain.
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