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Local structure in single crystals of La-based high Tccuprates

J Tonishi1, M Ueda1, T Suzuki1,2, A Oosawa1, T Goto1,4, T Adachi3, Y Koike3, M Fujita4 and K Yamada4

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The buckling of CuO2 plane in single crystals of La2−xSrxCuO4 (LSCO) [x = 0.08] and La2−xyBaySrxCuO4 (LBSCO) [x = 0.06 , y = 0.065] was directly observed by high-field Cu-NMR spectra. The split pattern in the NMR spectra of LSCO [x = 0.08] shows that the local structure is Low Temperature Orthorhombic (LTO) like at low temperature, consistent with the results reported by diffraction experiments. In LBCO [x = 0.08], the local structure is Low Temperature Tetragonal (LTT) like, while the averaged structure is reported to be LTO. In LBSCO, the local structure is found to be either LTT-like or Low Temperature Less- Orthorhombic (LTLO) between 35 and 70 K, while the averaged structure is reported to be LTO. With decreasing temperature, the resonance peak disappeared below 35 K, indicating the appearance of Charge Density Wave (CDW) or Spin Density Wave (SDW).


PACS

74.72.Dn La-based cuprates

74.25.Nf Response to electromagnetic fields (nuclear magnetic resonance, surface impedance, etc.)

61.66.Fn Inorganic compounds

71.45.Lr Charge-density-wave systems

64.70.K- Solid–solid transitions

71.70.Jp Nuclear states and interactions

Subjects

Superconductivity

Condensed matter: electrical, magnetic and optical

Condensed matter: structural, mechanical & thermal

Dates

Issue 1 (2006)



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