Crystal Growth and Neutron Scattering Study of Spin Correlations of the T′-Structured Pr2-xCaxCuO4
Crystal Growth and Neutron Scattering Study of Spin Correlations of the T′-Structured Pr2-xCaxCuO4
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T′结构Pr2-xCaxCuO4自旋相关性的晶体生长和中子散射研究
DOI：
10.1088/1742-6596/969/1/012070
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
Danilkin Sergey
中科院分区：
文献类型：
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作者：
Fujita Masaki;Tsutsumi Kenji;Miura Tomohiro;Danilkin Sergey
通过生长Pr 2− x Ca x CuO 4（x= 0.05和0.10）单晶以及合成Pr 1.90 Ca 0.10 CuO 4和Eu 1.90 Ca 0.10 CuO 4粉末样品，研究了Ca掺杂对T '型铜氧化物RE 2 CuO 4（RE：稀土）自旋关联的影响。在所有制备和退火样品中，通过磁化率测量没有观察到与超导性相关的屏蔽信号的证据。弹性中子散射测量上生长的Pr 1.90 Ca 0.10 CuO 4澄清的长程磁序与相称的自旋相关的存在。有序化温度为290 K，与母体化合物Pr 2CuO 4的Néel温度相当。相称的低能量自旋激发的存在也证实了退火Pr 1.95 Ca 0.05 CuO 4的非弹性中子散射测量。这些结果强烈地表明Ca掺杂对T '-RE 2CuO 4的物理性质的影响可以忽略不计，这与T-RE 2CuO 4中磁性的剧烈掺杂演变是完全不同的。
We studied Ca-doping effect on spin correlations in T'-structured cuprate oxide RE 2 CuO 4 (RE: rear earth) with growing a sizable single crystal of Pr 2− x Ca x CuO 4 (x= 0.05 and 0.10) as well as synthesizing powder samples of Pr 1.90 Ca 0.10 CuO 4 and Eu 1.90 Ca 0.10 CuO 4. In the all as-prepared and annealed samples, no evidence of shielding signal associated with superconductivity was observed by magnetic susceptibility measurement. Elastic neutron scattering measurements on the as-grown Pr 1.90 Ca 0.10 CuO 4 clarified the existence of long-ranged magnetic order with commensurate spin correlation. The ordering temperature was determined to be∼ 290K, which is comparable to Néel temperature in the parent compound of Pr 2 CuO 4. The existence of commensurate low-energy spin excitation was also confirmed by inelastic neutron scattering measurements for the annealed Pr 1.95 Ca 0.05 CuO 4. These results strongly suggest a negligible Ca-doping effect on the physical properties in T'-RE 2 CuO 4, which is quite different from the drastic doping evolution of magnetism in T-RE 2 CuO 4.