Probing putative orbital differentiation effects via Eu2+spin dynamics in Sr1-xEuxFe2As2

被引：1

作者：

Radaelli, M. ^{[1
]}

Piva, M. M. ^{[1
,2
]}

Souza, J. C. ^{[1
,6
]}

Lesseux, G. G. ^{[1
]}

Jesus, C. B. R. ^{[1
,3
]}

Tobia, D. ^{[1
,4
]}

Urbano, R. R. ^{[1
]}

Rosa, P. F. S. ^{[5
]}

Pagliuso, P. G. ^{[1
,5
]}

机构：

[1] Univ Estadual Campinas, Inst Fis Gleb Wataghin, BR-13083859 Campinas, SP, Brazil

[2] Max Planck Inst Chem Phys Solids, Nothnitzer Str 40, D-01187 Dresden, Germany

[3] Univ Fed Sergipe, Dept Fis, BR-49500000 Sao Cristovao, Sergipe, Brazil

[4] Ctr Atom Bariloche, Inst Nanociencia & Nanotecnol CNEA CONICET, San Carlos De Bariloche, Rio Negro, Argentina

[5] Los Alamos Natl Lab, Los Alamos, NM 87545 USA

[6] Weizmann Inst Sci, Dept Condensed Matter Phys, Rehovot, Israel

来源：

PHYSICAL REVIEW B | 2023年 / 107卷 / 13期

基金：

巴西圣保罗研究基金会;

关键词：

ELECTRON-SPIN-RESONANCE; SUPERCONDUCTIVITY; RELAXATION; METALS; ABSORPTION; ALKALI; IONS;

D O I：

10.1103/PhysRevB.107.134512

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In this work, we report x-ray powder diffraction, elemental analysis, electrical resistivity, magnetic suscep-tibility, specific heat, and electron spin resonance (ESR) in single crystals of Sr1-xEuxFe2As2. We observed a breakdown of the previously reported scaling between the Eu2+ Korringa relaxation rate obtained from ESR and the spin density wave temperature evolution for Sr-rich samples. This result suggests a distinct evolution of the orbital differentiation of the Fe 3d bands along the Sr-based series when compared to the Ba counterpart. We argue that this difference is related to a larger splitting between the structural (tetragonal-to-orthorhombic) and the Fe-driven spin density wave transitions induced by Eu doping in this series. In fact, our results indicate that the two transitions follow an opposite x-Eu dependence for Sr-concentrated samples. Our work shows that Sr1-xEuxFe2As2 series and the comparison with their Ba-based counterparts are exciting platforms to be explored for understanding the interplay among orbital differentiation, magnetism, and structural distortions in the iron pnictides.

引用

页数：8

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