Dipartimento di Fisica, Sapienza Università di Roma, P.le Aldo Moro 2, I-00185 Roma, Italy.
Phys Rev Lett. 2009 Dec 31;103(26):267201. doi: 10.1103/PhysRevLett.103.267201. Epub 2009 Dec 22.
The spin-glass transition in a magnetic field is studied both in and out of the limit of validity of mean-field theory on a diluted one dimensional chain of Ising spins where exchange bonds occur with a probability decaying as the inverse power of the distance. Varying the power in this long-range model corresponds, in a one-to-one relationship, to changing the dimension in spin-glass short-range models. Evidence for a spin-glass transition in a magnetic field is found also for systems whose equivalent dimension is below the upper critical dimension in a zero magnetic field.
磁场中的自旋玻璃转变在稀释一维伊辛自旋链中，超出和在平均场理论的有效性范围之外都进行了研究，其中交换键的出现概率随距离的倒数呈指数衰减。在这个长程模型中改变幂次，对应于在自旋玻璃短程模型中改变维度。即使在等效维度低于零磁场中上限临界维度的系统中，也发现了磁场中自旋玻璃转变的证据。
