Glassy statics and dynamics in the chemically ordered pyrochlore anti-ferromagnet Y2Mo2O7
Glassy statics and dynamics in the chemically ordered pyrochlore anti-ferromagnet Y2Mo2O7
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DOI：
10.1103/physrevlett.83.211
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发表时间：
1999-07-05
影响因子：
8.6
通讯作者：
Greedan, JE
中科院分区：
文献类型：
--
作者：
Gardner, JS;Gaulin, BD;Greedan, JE
用中子散射方法研究了几何阻挫烧绿石反铁磁体Y_2Mo_2O_7的静态和动态磁关联。该材料是化学有序的，但在类似于22.5 K的T-g下显示自旋冻结转变。我们表明，动态短程有序发展低于室温。在冷却时，两自旋关联长度不会超过5埃，但自旋涨落率与T-T-g成比例地消失。对于T < T-g定律，自旋涨落被静态反铁磁短程有序所取代，其冻结交错磁化强度S/S约为0.67（2）.局部冻结自旋结构对应于四个零磁化的子晶格有序。
Static and dynamic magnetic correlations in the geometrically frustrated pyrochlore antiferromagnet Y2Mo2O7 have been studied using neutron scattering. The material is chemically ordered but displays a spin-freezing transition at T-g similar to 22.5 K. We show that dynamic short range order develops below room temperature. Upon cooling the two-spin correlation length never exceeds 5 Angstrom, yet the spin fluctuation rate vanishes in proportion to T - T-g. For T < T-g law energy spin fluctuations are replaced by static antiferromagnetic short range order with a frozen staggered magnetization \< S >\/S approximate to 0.67(2). Locally the frozen spin structure corresponds to four sublattice ordering with zero magnetization.