Mass Enhancements and Band Shifts in Strongly Hole-Overdoped Fe-Based Pnictide Superconductors: KFe2As2 and CsFe2As2
Mass Enhancements and Band Shifts in Strongly Hole-Overdoped Fe-Based Pnictide Superconductors: KFe2As2 and CsFe2As2
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DOI：
10.1007/s10948-017-4434-5
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发表时间：
2018-01
影响因子：
1.8
通讯作者：
S. Drechsler;H. Rosner;V. Grinenko;V. Grinenko;S. Aswartham;I. Morozov;I. Morozov;I. Morozov;M. Liu;M. Liu;A. Boltalin;K. Kihou;Chul-Ho Lee;Timur K. Kim;D. Evtushinsky;J. Tomczak;S. Johnston;S. Borisenko
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作者：
S. Drechsler;H. Rosner;V. Grinenko;V. Grinenko;S. Aswartham;I. Morozov;I. Morozov;I. Morozov;M. Liu;M. Liu;A. Boltalin;K. Kihou;Chul-Ho Lee;Timur K. Kim;D. Evtushinsky;J. Tomczak;S. Johnston;S. Borisenko
高能和低能质量重整化与能带位移的相互作用由最强烈的空穴过掺杂相关 A=K、Cs 的 AFe2As2(A122) 正常态光谱中范霍夫奇点 (VHS) 的位置所反映，从 ARPES 数据和全自旋轨道耦合的能带结构 (GGA) 计算中，从现象学角度讨论了高能和低能质量重正化与能带位移的相互作用。索末菲系数 γ 从 K122 到 Cs122 的大幅增加归因于量子临界点附近的低能玻色子与未知但与莫特相不同的不相称相位的耦合增强。与 Eilers 等人相比，我们发现 Cs122 的相关性没有显着增加。 （物理Rev.Lett.116, 237003 2016）。与 GGA 预测相比，经验 (ARPES) VHS 位置甚至表明 Cs122 中的相关性稍弱，符合低 T 磁化率 χ(T) 数据和不断下降的威尔逊比 ∝χ(0)/γ。
The interplay of high- and low-energy mass renormalizations with band shifts reflected by the positions of van Hove singularities (VHS) in the normal-state spectrum of the most strongly hole-overdoped correlated AFe2As2(A122) with A=K, Cs is discussed phenomenologically from ARPES data and band-structure (GGA) calculations with full spin-orbit coupling. The big increase of the Sommerfeld coefficientγfrom K122 to Cs122 is ascribed to an enhanced coupling to low-energy bosons in the vicinity of a quantum critical point to an unknown, yet incommensurate phase different from the commensurate Mott one. We find no sizeable increase in correlations for Cs122 in contrast to Eilers et al. (Phys. Rev. Lett.116, 237003 2016). The empirical (ARPES) VHS positions as compared with GGA predictions point even to slightly weaker correlations in Cs122 in accord with low-Tmagnetic susceptibilityχ(T) data and a decreasing Wilson ratio ∝χ(0)/γ.