Fermi surface topology of Ca1.5Sr0.5RuO4 determined by angle-resolved photoelectron spectroscopy.
Fermi surface topology of Ca1.5Sr0.5RuO4 determined by angle-resolved photoelectron spectroscopy.
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DOI：
10.1103/physrevlett.93.177007
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发表时间：
2004-10
影响因子：
8.6
通讯作者：
S.-C. Wang;H.-B. Yang;A. Sekharan;S. Souma;H. Matsui;T. Sato;T. Takahashi;Chenxi Lu;Jiandi Zhang;R. Jin;D. Mandrus;E. W. Plummer;Z. Wang;H. Ding
中科院分区：
文献类型：
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作者：
S.-C. Wang;H.-B. Yang;A. Sekharan;S. Souma;H. Matsui;T. Sato;T. Takahashi;Chenxi Lu;Jiandi Zhang;R. Jin;D. Mandrus;E. W. Plummer;Z. Wang;H. Ding
我们报告的角度分辨光电子能谱的费米面的Ca 1.5Sr 0.5RuO4，这是在边界的磁性/轨道不稳定性的相图中的Ca-取代的Sr-双烯酸盐的结果。三个t（2g）能带和相应的费米面片，这也存在于无钙Sr 2 RuO 4。我们发现，虽然费米面拓扑的α，β（d（yz，zx））片保持几乎相同的这两种材料，γ（d（xy））片表现出一个孔状费米面在Ca 1.5Sr 0.5RuO4中的Sr 2 RuO 4的电子相反。我们观察到的所有三个体积守恒费米面片清楚地表明，没有轨道选择性莫特过渡，这是理论上提出来解释不寻常的运输和磁性的Ca1.5Sr0.5RuO4。
We report angle-resolved photoelectron spectroscopy results of the Fermi surface of Ca1.5Sr0.5RuO4, which is at the boundary of magnetic/orbital instability in the phase diagram of the Ca-substituted Sr ruthenates. Three t(2g) energy bands and the corresponding Fermi surface sheets are observed, which are also present in the Ca-free Sr2RuO4. We find that while the Fermi surface topology of the alpha,beta (d(yz,zx)) sheets remains almost the same in these two materials, the gamma (d(xy)) sheet exhibits a holelike Fermi surface in Ca1.5Sr0.5RuO4 in contrast to being electronlike in Sr2RuO4. Our observation of all three volume conserving Fermi surface sheets clearly demonstrates the absence of orbital-selective Mott transition, which was proposed theoretically to explain the unusual transport and magnetic properties in Ca1.5Sr0.5RuO4.