A µSR study of the magnetoresistive ruthenocuprates RuSr2Nd(1.8-x)Y0.2Ce(x)Cu2O(10-d) (x = 0.95 and 0.80).
A µSR study of the magnetoresistive ruthenocuprates RuSr2Nd(1.8-x)Y0.2Ce(x)Cu2O(10-d) (x = 0.95 and 0.80).
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磁阻钌铜矿 RuSr2Nd(1.8-x)Y0.2Ce(x)Cu2O(10-d)（x = 0.95 和 0.80）的 µSR 研究。
DOI：
10.1088/0953-8984/23/36/365704
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发表时间：
2011
期刊：
影响因子：
--
通讯作者：
McLaughlin AC
中科院分区：
文献类型：
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作者：
McLaughlin AC
利用零场介子自旋弛豫（ZF-μSR）研究了欠掺杂巨磁阻钌酸盐RuSr 2 Nd 1.8−x Y 0.2 Ce x cu2o 10−δ (x= 0.95, 0.80)的磁性能。磁阻（MR）的定义为MR=(ρ H−ρ 0)/ρ 0)，巨磁阻钌酸盐RuSr 2 Nd 1.8−x Y 0.2 Ce x cu2o 10−δ在施加磁场时表现出较大的电子电阻率降低。ZF-μSR结果表明，在钌自旋转变温度T Ru处，初始不对称性a0逐渐丧失。同时，在T Ru以下，随着温度的降低，电子弛豫速率λ逐渐增大。这些结果被解释为Cu自旋团簇在T - Ru下形成的证据。这些磁有序团簇随着温度的降低而增长，从而导致初始不对称性缓慢降低。在较宽的温度范围内观察到材料的巨磁电阻，并且随着温度从T Ru降低到4 K，其量级增加，这表明Cu自旋团簇尺寸与| - MR|之间存在关系。
Zero field muon spin relaxation (ZF-μSR) has been used to study the magnetic properties of the underdoped giant magnetoresistive ruthenocuprates RuSr 2 Nd 1.8− x Y 0.2 Ce x Cu 2 O 10− δ (x= 0.95, 0.80). The magnetoresistance (MR) is defined so that MR=((ρ H− ρ 0)/ρ 0) and the giant magnetoresistive ruthenocuprates RuSr 2 Nd 1.8− x Y 0.2 Ce x Cu 2 O 10− δ exhibit a large reduction in electronic resistivity upon application of a magnetic field. The ZF-μSR results show a gradual loss of initial asymmetry A 0 at the ruthenium spin transition temperature, T Ru. At the same time the electronic relaxation rate, λ, shows a gradual increase with decreasing temperature below T Ru. These results have been interpreted as evidence for Cu spin cluster formation below T Ru. These magnetically ordered clusters grow as the temperature is decreased thus causing the initial asymmetry to decrease slowly. Giant magnetoresistance is observed over a wide temperature range in the materials studied and the magnitude increases as the temperature is reduced from T Ru to 4 K which suggests a relation between Cu spin cluster size and|− MR|.