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Singular behaviour

机译:单一行为

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摘要

More than a century of probing the physics of magnetism has only served to heighten its interest for physicists. Over the past decade, a new focus has evolved ― the behaviour of magnetic materials at a 'quantum critical point'. Critical points are perhaps more familiarly associated with phase transitions such as those between water, steam and ice. But at zero temperature there are quantum phase transitions, fluctuations between different states of a phase diagram that are governed by Heisenberg's uncertainty principle. In certain magnetic materials, the temperature at which the system takes on a magnetically ordered state can be tuned, either chemically or through some external influence, towards absolute zero, the transition point being a quantum critical point. The question is, at a quantum critical point, do we see something new that does not occur in classical systems? On page 524 of this issue, Custers et al. 2 go some way towards an answer, through the closest approach yet to a quantum critical point in a 'heavy-fermion' material.
机译:探测磁性物理学一个多世纪以来,一直仅对物理学家产生了浓厚的兴趣。在过去的十年中,一个新的焦点发生了变化-磁性材料在“量子临界点”的行为。临界点也许更熟悉与水,蒸汽和冰之间的相变相关。但是在零温度下,存在量子相变,即相图的不同状态之间的波动,受海森堡不确定性原理支配。在某些磁性材料中,可以通过化学方式或通过某种外部影响将系统呈磁有序状态的温度调整到绝对零,过渡点是量子临界点。问题是,在量子临界点上,我们是否看到了经典系统中不会发生的新事物?在此问题的第524页上,Custers等人。 2通过最接近“重费米子”材料中的量子临界点的方法,找到了答案。

著录项

  • 来源
    《Nature》 |2003年第6948期|p.504-505|共2页
  • 作者

    Zachary Fisk;

  • 作者单位

    Department of Physics, Florida State University, Tallahassee, Florida 32306, and the Los Alamos National Laboratory, K774, Los Alamos, New Mexico 87545, USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 自然科学总论;
  • 关键词

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