arXiv 2007.035442020-07-07cond-mat.str-el

$R$ SrNiO $_4$中的电荷分离和纳米相分离

Charge disproportionation and nano phase separation in $R$SrNiO$_4$

H. Guo, Z. W. Li, C. F. Chang, Z. Hu, C. -Y. Kuo, T. G. Perring, W. Schmidt, A. Piovano, K. Schmalzl, H. C. Walker, H. J. Lin, C. T. Chen, S. Blanco-Canosa, J. … 展开作者

H. Guo, Z. W. Li, C. F. Chang, Z. Hu, C. -Y. Kuo, T. G. Perring, W. Schmidt, A. Piovano, K. Schmalzl, H. C. Walker, H. J. Lin, C. T. Chen, S. Blanco-Canosa, J. Schlappa, C. Schüßler-Langeheine, P. Hansmann, D. I. Khomskii, L. H. Tjeng, A. C. Komarek

发表信息：: Sci. Rep. 10, 18012 (2020)

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摘要：

我们已经成功地生长厘米级的层状$R$ SrNiO $_4$单晶在120巴的高氧气压力下的浮区技术。这使我们能够进行中子散射实验，我们观察到接近四分之一整数磁峰低于$\sim$ 77 K，伴随着陡峭的向上分散的自旋激发。在高频Ni-O键伸缩声子色散中，可以观察到棋盘调制的传播矢量处的软化。连同我们的自旋波模拟，这些观察结果表明，该Ni $^{3+}$系统表现出电荷分离成棋盘图案内的纳米相分离的情况下，而不是显示出Jahn-Teller效应。

英文摘要：

We have successfully grown centimeter-sized layered $R$SrNiO$_4$ single crystals under high oxygen pressures of 120 bar by the floating zone technique. This enabled us to perform neutron scattering experiments where we observe close to quarter-integer magnetic peaks below $\sim$77 K that are accompanied by steep upwards dispersing spin excitations. Within the high-frequency Ni-O bond stretching phonon dispersion, a softening at the propagation vector for a checkerboard modulation can be observed. Together with our spin wave simulations these observations reveal that this Ni$^{3+}$ system exhibits charge disproportionation with charges segregating into a checkerboard pattern within a nano phase separation scenario rather than showing a Jahn-Teller effect.

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