NMR study of the magnetic properties of the ordered perovskite <f>Sr2Cu(Re0.69Ca0.31)O6</f>

NMR measurements have been performed on the ordered perovskite <f>Sr2Cu(Re0.69Ca0.31)O6</f> which shows ferromagnetic (ferrimagnetic) properties below <f>Tc∼440 K</f> with spontaneous magnetization of about <f>0.25 μB</f> per formula unit at <f>5 K</f>. Two kinds of NMR lines showing large enhancement of NMR signals were observed at <f>5 K</f> with <f>H=0.5 T</f> at the frequency range from 58 to <f>180 MHz</f>, and each line was attributed to the Cu1 and Cu2 site. [Copyright &y& Elsevier]