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首页> 外文期刊>Solid State Communications >A mechanical spectrum study of bilayer cuprate La_(1.82)Sr_(0.18)CaCu_2O_(6+δ)
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A mechanical spectrum study of bilayer cuprate La_(1.82)Sr_(0.18)CaCu_2O_(6+δ)

机译：双层铜酸盐La_（1.82）Sr_（0.18）CaCu_2O_（6 +δ）的力学光谱研究

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摘要

The mechanical spectrum of bilayer cuprate La_(1.82)Sr_(0.18)CaCu_2O_(6+δ) (La2126) was measured using the vibrating reed method from 30 K to room temperature at kilohertz frequency. A clear modulus softening was observed at 223 K accompanied by a sharp internal friction peak, which evidences a phase transition. Another broad internal friction peak around 250 K was observed, accompanied by a large modulus change. This contrasts with the broad internal friction peak of Ca doped YBa_2Cu_3O_(7-δ) (Y123) for which no clear modulus change was observed. The main contribution to the broad internal friction peak of La2126 is expected to be from the glass transition of the interstitial oxygen atoms.
机译：使用振动片法在千赫兹频率下从30 K到室温测量双层铜酸盐La_（1.82）Sr_（0.18）CaCu_2O_（6 +δ）（La2126）的机械光谱。在223 K处观察到明显的模量软化，并伴随着尖锐的内部摩擦峰，这证明了相变。在250 K附近观察到另一个宽的内部摩擦峰，伴随着较大的模量变化。这与Ca掺杂的YBa_2Cu_3O_（7-δ）（Y123）的宽内摩擦峰相反，该峰没有观察到明显的模量变化。预期对La2126宽的内部摩擦峰的主要贡献来自间隙氧原子的玻璃化转变。

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