Magnetic order or charge-density wave in La2NiO4 by Mössbauer spectroscopy
Magnetic order or charge-density wave in La2NiO4 by Mössbauer spectroscopy
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DOI：
10.1103/physrevb.30.6320
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发表时间：
1984-12
影响因子：
3.7
通讯作者：
J. Fontcuberta;G. Longworth;J. Goodenough
中科院分区：
文献类型：
--
作者：
J. Fontcuberta;G. Longworth;J. Goodenough
在297、77和4.2 K下对$^{57}\ mathm {Fe}$: $ $ \ mathm {La}}_{2}$Ni$ $ \ mathm {O}}_{4}$的M\ \ ossbauer吸收光谱的测量，提供了在最低温度下，含有$^{57}\ mathm {Fe}^{3+}$离子杂质和一些${\ mathm {La}} {2+n}{\ mathm {Ni}} {1+n}}{\ mathm {O}} {4+3n}$互生的样品的磁序的证据。在77 K和4.2 K下，$^{57}\ mathm {Co}$: ${\ mathm {La}}^{2}$Ni${\ mathm {O}}_{4}$的M\ \ ossbauer发射光谱显示，在含有少量$^{57}\ mathm {Co}$离子杂质和${\ mathm {La}} {2+n}{\ mathm {Ni}} {1+n}}{\ mathm {O}} {4+3n}$共生的样品中，磁序与顺磁性共存。这些结果被解释为在狭窄的${\ensuremath{\sigma}}_{{x}^{2}\ensuremath{-}{y}^{2}}^{*}$带中电子之间磁有序和电荷密度波形成竞争的证据；共生、杂质和非化学计量有利于磁有序。
Measurements of M\"ossbauer absorption spectra of $^{57}\mathrm{Fe}$: ${\mathrm{La}}_{2}$Ni${\mathrm{O}}_{4}$ at 297, 77, and 4.2 K provide evidence, at the lowest temperatures, of magnetic order in a sample containing $^{57}\mathrm{Fe}^{3+}$-ion impurities and some ${\mathrm{La}}_{2+n}{\mathrm{Ni}}_{1+n}{\mathrm{O}}_{4+3n}$ intergrowth. M\"ossbauer emission spectra of $^{57}\mathrm{Co}$: ${\mathrm{La}}^{2}$Ni${\mathrm{O}}_{4}$ at 77 and 4.2 K show magnetic order coexisting with paramagnetism in a sample containing a small concentration of $^{57}\mathrm{Co}$-ion impurities and some ${\mathrm{La}}_{2+n}{\mathrm{Ni}}_{1+n}{\mathrm{O}}_{4+3n}$ intergrowth. These results are interpreted as evidence for competition between magnetic ordering and charge-density-wave formation among electrons of a narrow ${\ensuremath{\sigma}}_{{x}^{2}\ensuremath{-}{y}^{2}}^{*}$ band; intergrowths, impurities, and nonstoichiometry favor magnetic ordering.