RuSr2（Nd，Y，Ce）_2Cu_2O_（10-d）六方铜酸盐的感生反铁磁性和大磁电阻
Induced antiferromagnetism and large magnetoresistances in RuSr2(Nd,Y,Ce)2Cu2O10-d ruthenocuprates
摘要：
用中子衍射、磁输运和磁化强度测量研究了RuSr_2（Nd，Y，Ce）_2Cu_2 O_（10-d）六方铜酸盐，并给出了电子相图。观察到单独的Ru和Cu自旋有序转变，对于低空穴掺杂水平p具有自发的Cu反铁磁有序，并且在0.02 < p < 0.06赝能隙区域中具有明显的诱导反铁磁Cu自旋相。这种顺序引起大的负磁阻随RuSr2Nd1.8-xY0.2CexCu2O10-d系列中的p系统地变化。磁电阻（MR）和磁化强度在预超导区的崩溃可能意味着超导波动的开始。
英文摘要：
RuSr2(Nd,Y,Ce)2Cu2O10-d ruthenocuprates have been studied by neutron diffraction, magnetotransport and magnetisation measurements and the electronic phase diagram is reported. Separate Ru and Cu spin ordering transitions are observed, with spontaneous Cu antiferromagnetic order for low hole doping levels p, and a distinct, induced-antiferromagnetic Cu spin phase in the 0.02 < p < 0.06 pseudogap region. This ordering gives rise to large negative magnetoresistances which vary systematically with p in the RuSr2Nd1.8-xY0.2CexCu2O10-d series. A collapse of the magnetoresistance (MR) and magnetisation in the pre-superconducting region may signify the onset of superconducting fluctuations.
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