Phonon anomalies and magnetic excitations in BaFe2Se2O

被引：4
|
作者：
Jin, Feng [1 ,2 ]
Lazarevic, Nenad [3 ]
Liu, Changle [4 ,5 ]
Ji, Jianting [6 ]
Wang, Yimeng [1 ,2 ]
He, Shuna [1 ,2 ]
Lei, Hechang [1 ,2 ]
Petrovic, Cedomir [7 ]
Yu, Rong [1 ,2 ]
Popovic, Zoran, V [3 ,8 ]
Zhang, Qingming [6 ,9 ]
机构：
[1] Renmin Univ China, Dept Phys, Beijing 100872, Peoples R China
[2] Renmin Univ China, Beijing Key Lab Optoelect Funct Mat & Micronano D, Beijing 100872, Peoples R China
[3] Univ Belgrade, Ctr Solid State Phys & New Mat, Inst Phys Belgrade, Pregrevica 118, Belgrade 11080, Serbia
[4] Fudan Univ, State Key Lab Surface Phys, Shanghai 200433, Peoples R China
[5] Fudan Univ, Dept Phys, Shanghai 200433, Peoples R China
[6] Chinese Acad Sci, Inst Phys, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China
[7] Brookhaven Natl Lab, Condensed Matter Phys & Mat Sci Dept, Upton, NY 11973 USA
[8] Serbian Acad Arts & Sci, Knez Mihailova 35, Belgrade 11000, Serbia
[9] Lanzhou Univ, Sch Phys Sci & Technol, Lanzhou 730000, Gansu, Peoples R China
来源：
PHYSICAL REVIEW B | 2019年 / 99卷 / 14期
基金：
中国国家自然科学基金;
关键词：
RAMAN-SCATTERING; LIGHT-SCATTERING; SPIN LADDERS; BOUND-STATES; S=1/2; SPECTRUM; ORDER;
D O I：
10.1103/PhysRevB.99.144419
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We report a temperature- and magnetic-field-dependent Raman-scattering study of the spin-ladder compound BaFe2Se2O. Temperature evolution of the B-1g mode self-energies revealed anomalous behavior at about 100 and 240 K with strong temperature-dependent Fano asymmetry. Furthermore, the A(g) modes integrated intensity exhibits an additional change in tendency at about 50 K. All the observed anomalies can be traced back to spin-phonon interaction contributions as well as multiple magnetic phase transitions present in BaFe2Se2O also detected in the Raman continuum induced by the spin fluctuations. Moreover, the absence of magnetic-field dependence of the magnetic mode observed at 436 cm(-1) and the small linewidth and high intensity are different from the magnetic modes at about 650 cm(-1). This suggests a two-magnon continuum and a two-magnon bound state resonance for this mode.
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页数：7
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