首页> 外文期刊>Physica status solidi, B. Basic research >Exchange interactions between dissimilar JT copper ions in K2Zn0.92Cu0.08(SO4)2 center dot 6D(2)O and (ND4)(2)Mg0.92Cu0.08(SO4)(2) center dot 6D(2)O crystals
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Exchange interactions between dissimilar JT copper ions in K2Zn0.92Cu0.08(SO4)2 center dot 6D(2)O and (ND4)(2)Mg0.92Cu0.08(SO4)(2) center dot 6D(2)O crystals

机译:K2Zn0.92Cu0.08(SO4)2中心点6D(2)O和(ND4)(2)Mg0.92Cu0.08(SO4)(2)中心点6D(2)O晶体中的不同JT铜离子之间的交换相互作用

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A study of exchange and vibronic interactions in pairs of dissimilar (D-S) Jahn-Teller ions in Cu2+ doped zinc potassium (I) and magnesium ammonium (II) Tatton salts is reported. An interpretation of EPR spectra is done on the basis of the predicted differences in the angular dependences of resonance lines originating from isolated centres and pairs of similar and dissimilar ions. An assignment of D-S pairs is confirmed by the so-called reverse shift manifested as non-coincidence of the centres of pair spectra with those of appropriate isolated ion spectra. It is shown that for the spin-spin interaction parameter K < (g(1z) - g(2z)) betaB (K is the sum of isotropic (J) and anisotropic (D) contributions) the reverse shift is always present in the spectrum of exchange pairs of D-S ions. The gz values for such pairs are determined by g(z pair) = g(1,2z) +/- 1/4(g(1z) - g(2z))Delta(2)(2), where Delta(2) = (K-xx + K-yy)/[2(g(1z) - g(2z)) betaB]. The reverse shift for he compounds studied takes values of 0.6-1.0 mT The values of J((I))=0.0034cm(-1); D-(I) = 0.0072 cm(-1) for the potassium and J((II)) = 0.009 cm(-1). D-(II) = 0.0068 cm(-1) for the ammonium compounds are determined. A possible existence of vibronic correlation is discussed. [References: 30]
机译:报道了在掺杂Cu2 +的锌钾(I)和镁铵(II)的塔顿盐中,成对的(D-S)Jahn-Teller离子对之间的交换和振动相互作用的研究。 EPR光谱的解释是基于共振线的角度相关性的预测差异而完成的,这些共振线源于孤立的中心以及成对的相似和不相似离子。 D-S对的分配通过所谓的反向移位得到确认,这种反向移位表现为对光谱中心与合适的离析离子光谱中心不重合。结果表明,对于自旋-自旋相互作用参数K <(g(1z)-g(2z))betaB(K是各向同性(J)和各向异性(D)的总和),反向位移始终存在于DS离子交换对的光谱。此类对的gz值由g(z对)= g(1,2z)+/- 1/4(g(1z)-g(2z))Delta(2)(2)确定,其中Delta(2 )=(K-xx + K-yy)/ [2(g(1z)-g(2z))betaB]。研究的化合物的反向位移值为0.6-1.0 mT。J((I))= 0.0034cm(-1);钾的D-(I)= 0.0072 cm(-1),J((II))= 0.009 cm(-1)。确定了铵化合物的D-(II)= 0.0068 cm(-1)。讨论了振动相关性的可能存在。 [参考:30]

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