Charge instabilities at the metamagnetic transition of itinerant electron systems

Carsten Honerkamp

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Charge instabilities at the metamagnetic transition of itinerant electron systems

机译：迭代电子系统的亚磁跃迁中的电荷不稳定性

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We investigate instabilities in the charge channel in the vicinity of (meta)magnetic transitions of itinerant electron systems. Based on a weak-coupling analysis we argue that in a one-band t-t' Hubbard model near the van Hove filling and dominant ferromagnetic fluctuations it is difficult to account for a microscopic mechanism for a d-wave Pomeranchuk deformation of the Fermi surface. A similar deformation has been considered for the metamagnetic transition in Sr_3Ru_2O_7. As an alternative we discuss the possibility of charge inhomogeneity on the nanoscale. This extends the analogy of the metamagnetic transition to a liquid-gas transition.

机译：我们研究了巡回电子系统的（元）磁跃迁附近电荷通道中的不稳定性。基于弱耦合分析，我们认为在范霍夫填充和主要铁磁涨落附近的单频带t-t'Hubbard模型中，很难解释费米表面的d波Pomeranchuk变形的微观机制。对于Sr_3Ru_2O_7中的超磁性跃迁，已经考虑了类似的变形。作为替代方案，我们讨论了纳米级电荷不均匀的可能性。这将超磁跃迁的类推扩展为液-气跃迁。

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《Physical review. B, Condensed Matter And Materials Physics》 |2005年第11期|p.115103.1-115103.5|共5页
作者
Carsten Honerkamp;
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作者单位

Universitaet Wuerzburg, Am Hubland, D-97074 Wuerzburg, Germany;

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正文语种 eng
中图分类固体物理学;
关键词
ruthenates; band and itinerant models; magnetic phase boundaries (including magnetic transitions, metamagnetism, etc.); domain effects, magnetization curves, and hysteresis;

机译：钌酸盐;带和流动模型;磁相边界（包括磁跃迁;超磁性等）;磁畴效应;磁化曲线和磁滞;

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3. Anomalous itinerant-electron metamagnetic transition in the layered Sr_(1-x)Ca_xCo_2P_2 system [J] . Masaki Imai, Chishiro Michioka, Hiroto Ohta, Physical review . 2014,第1期

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4. Microstructure transformation under itinerant-electron metamagnetic transition in LaFe_(11.6)Si_(1.4) [C] . Karpenkov Alexey Yu., Skokov Konstantin P., Karpenkov Dmitriy Yu., International Conference "Phase Transitions, Critical and Nonlinear Phenomena in Condensed Matter" . 2016

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5. Studies on space-charge waves and the resistive-wall instability in space-charge-dominated electron beams [D] . Suk, Hyyong. 1996

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Charge instabilities at the metamagnetic transition of itinerant electron systems

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