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Critical transport properties of random metals in large magnetic fields

机译:大磁场中随机金属的临界传输性质

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摘要

The threshold behavior of the transport properties of a random metal in the critical region near a metal–insulator transition is strongly affected by the measuring electromagnetic fields. In spite of the randomness, the electrical conductivity exhibits striking phase-coherent effects due to broken symmetry, which greatly sharpen the transition compared with the predictions of effective medium theories, as previously explained for electrical conductivities. Here broken symmetry explains the sign reversal of the T → 0 magnetoconductance of the metal–insulator transition in Si(B,P), also previously not understood by effective medium theories. Finally, the symmetry-breaking features of quantum percolation theory explain the unexpectedly very small electrical conductivity temperature exponent α = 0.22(2) recently observed in Ni(S,Se)2 alloys at the antiferromagnetic metal–insulator transition below T = 0.8 K.
机译:在金属-绝缘体过渡附近的关键区域中,随机金属的传输特性的阈值行为受到电磁场测量的强烈影响。尽管具有随机性,但由于破坏了对称性,电导率仍显示出惊人的相位相干效应,与有效介质理论的预测相比,电导率大大提高了跃迁,如先前对电导率的解释。这里破碎的对称性解释了Si(B,P)中金属-绝缘体跃迁的T→0磁导的符号反转,这在以前也未被有效的介质理论所理解。最后,量子渗流理论的对称性破裂特征解释了最近在T = 0.8 K以下的反铁磁金属-绝缘体跃迁中在Ni(S,Se)2合金中观察到的非常小的电导率温度指数α= 0.22(2)。

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