Microwave Absorption Peaks : Signatures of Spin Dynamics in Cuprates

Details Microwave Absorption Peaks : Signatures of Spin Dynamics in Cuprates Microwave Absorption Peaks : Signatures of Spin Dynamics in Cuprates

1999-06-03

arxiv.org/abs/cond-mat/9906053v2

Physics

Condensed Matter

Strongly Correlated Electrons

7 pages, 2 ps format figures

Scientific paper

We show that a common feature of temperature-dependent microwave absorption is the presence of absorption peaks. $ac$ loss peaks can arise when the internal $T$-dependent magnetic relaxation time crosses the measurement frequency. These features are observed in the \QTR{em}{insulating} ($Sr_{x}Ca_{14-x}Cu_{24}O_{41}$, $La_{5/3}Sr_{1/3}NiO_{4}$ and $YBa_{2}Cu_{3}O_{6.0}$), \QTR{em}{pseudo-gap} ($T>T_{c}$ in underdoped $YBa_{2}Cu_{3}O_{7-\delta}$, $Hg:1223$ and $Hg:1201$) and \QTR{em}{superconducting} ($T

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