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首页> 外文期刊>Physical review >Angular slippage from the crystallographic c axis of the reversible magnetization vector in a tilted crystal of a highly anisotropic cuprate superconductor
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Angular slippage from the crystallographic c axis of the reversible magnetization vector in a tilted crystal of a highly anisotropic cuprate superconductor

机译：高度各向异性的铜酸盐超导体的倾斜晶体中可逆磁化矢量的晶体c轴的角滑移

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摘要

The magnetization vector M was measured in the reversible region of the mixed state of a high-quality Tl_2Ba_2Ca_2Cu_3O_(10) single crystal as a function of temperature and for different magnetic field amplitudes and orientations. These measurements allowed to study the M components perpendicular and parallel to the CuO_2 layers (M_⊥ and M_||, respectively) under arbitrary values for the corresponding components of the applied magnetic field, H_⊥ and H_||. For temperatures close to T_c (in the critical fluctuation region), we observed M_⊥(H±,H_||) ≈ M_⊥(H_⊥,0) and M_||(H_⊥,H_||≈ 0, as expected for an extremely anisotropic material. However, deviations from this behavior are observed at lower temperatures in the London region. In particular, the M_|| amplitude under a constant H_⊥ decreases on increasing H_||. In turn, in spite of the experimental uncertainties affecting M_|| (mainly associated with the rotating sample holder), its amplitude under a constant H_||becomes observable on increasing H_⊥ Both effects lead to an angular slippage of the magnetization vector M from the c crystallographic axis when the applied magnetic field is tilted from that axis. The M_⊥ behavior is phenomenologically explained in the framework of Lawrence-Doniach approaches for single layered superconductors by just assuming a slight angular dependence of the so-called vortex structure constant. However, the observed M_|| is orders of magnitude larger than expected, a fact that is related to the multilayered nature of the compound studied. Our present results also directly affect the interpretation of recent measurements of the magnetic torque in other extremely anisotropic high-T_c cuprates.
机译：在高质量的Tl_2Ba_2Ca_2Cu_3O_（10）单晶的混合状态的可逆区域中，根据温度以及不同的磁场振幅和方向，测量了磁化矢量M。这些测量允许研究在任意值下所施加磁场的相应分量H_⊥和H_ ||的垂直和平行于CuO_2层的M分量（分别为M_⊥和M_ ||）。对于接近T_c的温度（在临界波动区域），我们观察到M_⊥（H±，H_ ||）≈M_⊥（H_⊥，0）和M_ ||（H_⊥，H_ ||≈≈0对于极各向异性的材料，在伦敦地区在较低的温度下会观察到这种行为的偏差，特别是在恒定H_⊥下的M_ ||振幅会随着H_ ||的增加而减小。不确定性会影响M_ ||（主要与旋转的样品架相关），在H_ ||增大时可观察到其在恒定H_ ||下的振幅两种作用都会导致在施加磁场时磁化矢量M从c结晶轴发生角滑移M_⊥行为是在Lawrence-Doniach方法的框架内对单层超导体进行了现象学解释的，只是假设所谓的涡旋结构常数存在微小的角度依赖性，但是观察到的M_ ||为比exp大几个数量级因此，这与所研究化合物的多层性质有关。我们目前的结果也直接影响最近对其他极各向异性的高T_c铜酸盐中磁转矩测量结果的解释。

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  • 来源
    《Physical review》 |2011年第13期|p.134504.1-134504.9|共9页
  • 作者

    J. Mosqueira; R. I. Rey; A. Wahl; F. Vidal;

  • 作者单位

    LBTS, Facultade de Fisica, Universidade de Santiago de Compostela, ES-J5782 Santiago de Compostela, Spain;

    LBTS, Facultade de Fisica, Universidade de Santiago de Compostela, ES-J5782 Santiago de Compostela, Spain;

    Laboratoire CRISMAT, ENS1CAEN, UMR 6508 CNRS, Caen, France;

    LBTS, Facultade de Fisica, Universidade de Santiago de Compostela, ES-J5782 Santiago de Compostela, Spain;

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  • 关键词

    magnetic properties; cuprate superconductors (high-Tc and insulating parent compounds);

    机译：磁性铜酸盐超导体（高Tc和绝缘母体化合物）;

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