Evolution of the Fermi surface and quasiparticle renormalization through a van Hove singularity in Sr2-yLayRuO4.
Evolution of the Fermi surface and quasiparticle renormalization through a van Hove singularity in Sr2-yLayRuO4.
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费米表面的演化和通过 Sr2-yLayRuO4 中范霍夫奇点的准粒子重正化。
DOI：
10.1103/physrevlett.99.187001
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发表时间：
2007
影响因子：
8.6
通讯作者：
A. Mackenzie
中科院分区：
文献类型：
--
作者：
K. Shen;N. Kikugawa;C. Bergemann;L. Balicas;F. Baumberger;W. Meevasana;N. Ingle;Y. Maeno;Z. Shen;A. Mackenzie
我们采用化学取代和角分辨光电子能谱相结合的方式证明了Sr(2-y)La(y)RuO(4)伽玛能带中的费米能级可以穿过范霍夫奇点。值得注意的是，大质量重整化对 k 或掺杂几乎没有依赖性。通过将同一批晶体的光电发射结果与热力学测量结果相结合，我们推导出Sr(2)RuO(4)中完整多体准粒子色散的参数化，该色散从费米能级延伸到其上方约20 meV。
We employ a combination of chemical substitution and angle resolved photoemission spectroscopy to prove that the Fermi level in the gamma band of Sr(2-y)La(y)RuO(4) can be made to traverse a van Hove singularity. Remarkably, the large mass renormalization has little dependence on either k or doping. By combining the results from photoemission with thermodynamic measurements on the same batches of crystals, we deduce a parametrization of the full many-body quasiparticle dispersion in Sr(2)RuO(4) which extends from the Fermi level to approximately 20 meV above it.