Severe Fermi surface reconstruction at a metamagnetic transition in Ca2-xSrxRuO4 (for 0.2 <or=x<or=0.5).
Severe Fermi surface reconstruction at a metamagnetic transition in Ca2-xSrxRuO4 (for 0.2 <or=x<or=0.5).
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DOI：
10.1103/physrevlett.95.196407
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发表时间：
2005-07
影响因子：
8.6
通讯作者：
L. Balicas;S. Nakatsuji;D. Hall;T. Ohnishi;Z. Fisk;Y. Maeno;D. Singh
中科院分区：
文献类型：
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作者：
L. Balicas;S. Nakatsuji;D. Hall;T. Ohnishi;Z. Fisk;Y. Maeno;D. Singh
本文报道了高磁场（B）下Ca_（2-x）Sr_xRuO_4单晶的电输运研究。对于x=0.2，霍尔常数Rxy急剧下降，在各向异性变磁过渡，达到其值为Sr 2 RuO 4在高场。电阻率T2项系数的急剧下降和B在平面内旋转的角磁阻振荡结构的变化证实了费米面的重构。我们的观察和局域密度近似计算表明，费米表面上的钙浓度的强烈依赖性，并建议在单层benatates巡回和本地化的电子状态共存。
We report an electrical transport study in Ca2-xSrxRuO4 single crystals at high magnetic fields (B). For x=0.2, the Hall constant Rxy decreases sharply at an anisotropic metamagnetic transition, reaching its value for Sr2RuO4 at high fields. A sharp decrease in the coefficient of the resistivity T2 term and a change in the structure of the angular magnetoresistance oscillations for B rotating in the planes confirms the reconstruction of the Fermi surface. Our observations and local-density-approximation calculations indicate a strong dependence of the Fermi surface on Ca concentration and suggest the coexistence of itinerant and localized electronic states in single layered ruthenates.