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Magnetic properties of lightly doped antiferromagnetic YBa_2Cu_3O_y

机译：轻掺杂反铁磁YBa_2Cu_3O_y的磁性

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摘要

The present work addresses YBa_2Cu_3O_y, at doping below x - 6% where the compound is a collinear antiferromagnet. In this region YBa_2Cu_3O_y is a normal conductor with finite resistivity at zero temperature. The value of the staggered magnetization at zero temperature is ≈0.6靇B, the maximum value allowed by spin quantum fluctuations. The staggered magnetization is almost independent of doping. On the other hand, the Neel temperature decays very quickly, from T_N = 420 K at x = 0 to practically zero at x ≈ 6%. The present paper explains these remarkable properties and demonstrates that the properties result from the physics of a lightly doped Mott insulator with small hole pockets. Nuclear quadrupole resonance data are also discussed. The data shed light on mechanisms of stability of the antiferromagnetic order at x < 6%.
机译：目前的工作针对YBa_2Cu_3O_y，其掺杂低于x-6％，其中该化合物是共线反铁磁体。在该区域中，YBa_2Cu_3O_y是零温度下具有有限电阻率的普通导体。零温度下的交错磁化强度值为≈0.6靇B，这是自旋量子涨落所允许的最大值。交错的磁化几乎与掺杂无关。另一方面，Neel温度衰减很快，从x = 0的T_N = 420 K到x≈6％时几乎为零。本文解释了这些非凡的特性，并证明了这些特性是由具有小孔穴的轻掺杂Mott绝缘子的物理性质产生的。还讨论了核四极共振数据。数据阐明了x <6％时反铁磁阶的稳定性机制。

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