Spectrally resolved femtosecond reflectivity relaxation dynamics in undoped spin-density wave 122-structure iron-based pnictides

A. Pogrebna, N. Vujičić, T. Mertelj, T. Borzda, G. Cao, Z. A. Xu, J.-H. Chu, I. R. Fisher, and D. Mihailovic

Phys. Rev. B 89, 165131 – Published 24 April 2014

Abstract

We systematically investigate temperature- and spectrally dependent optical reflectivity dynamics in $A$ As $_{2}$ Fe $_{2}$ , ( $A = Ba$ , Sr, and Eu), iron-based superconductors parent spin-density wave (SDW) compounds. Two different relaxation processes are identified. The behavior of the slower process, which is strongly sensitive to the magnetostructural transition, is analyzed in the framework of the relaxation-bottleneck model involving magnons. The results are compared to recent time-resolved angular photoemission results (TR-ARPES) and possible alternative assignment of the slower relaxation to the magnetostructural order parameter relaxation is discussed.

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Received 24 February 2014
Revised 8 April 2014

DOI:https://doi.org/10.1103/PhysRevB.89.165131

Authors & Affiliations

A. Pogrebna¹, N. Vujičić^1,2, T. Mertelj¹, T. Borzda¹, G. Cao³, Z. A. Xu³, J.-H. Chu⁴, I. R. Fisher⁴, and D. Mihailovic¹

¹Complex Matter Deptartment, Jozef Stefan Institute, Jamova 39, Ljubljana, SI-1000, Ljubljana, Slovenia
²Institute of Physics, Bijenička 46, HR-10000 Zagreb, Croatia
³Department of Physics, Zhejiang University, Hangzhou 310027, People Republic of China
⁴Geballe Laboratory for Advanced Materials and Department of Applied Physics, Stanford University, Stanford, California 94305, USA

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Vol. 89, Iss. 16 — 15 April 2014

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