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Ultrafast transient generation of spin-density-wave order in the normal state of BaFe<sub>2</sub>As<sub>2</sub> driven by coherent lattice vibrations

Ultrafast transient generation of spin-density-wave order in the normal state of BaFe2As2 driven by coherent lattice vibrations

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KIM, Kyung Wan, Oleksiy PASHKIN, Hanjo SCHÄFER, Markus BEYER, Michael PORER, Thomas WOLF, Christian BERNHARD, Jure DEMSAR, Rupert HUBER, Alfred LEITENSTORFER, 2012. Ultrafast transient generation of spin-density-wave order in the normal state of BaFe2As2 driven by coherent lattice vibrations. In: Nature Materials. 11(6), pp. 497-501. ISSN 1476-1122. eISSN 1476-4660. Available under: doi: 10.1038/nmat3294

@article{Kim2012-06Ultra-21711, title={Ultrafast transient generation of spin-density-wave order in the normal state of BaFe2As2 driven by coherent lattice vibrations}, year={2012}, doi={10.1038/nmat3294}, number={6}, volume={11}, issn={1476-1122}, journal={Nature Materials}, pages={497--501}, author={Kim, Kyung Wan and Pashkin, Oleksiy and Schäfer, Hanjo and Beyer, Markus and Porer, Michael and Wolf, Thomas and Bernhard, Christian and Demsar, Jure and Huber, Rupert and Leitenstorfer, Alfred} }

Demsar, Jure Leitenstorfer, Alfred Wolf, Thomas Ultrafast transient generation of spin-density-wave order in the normal state of BaFe<sub>2</sub>As<sub>2</sub> driven by coherent lattice vibrations Beyer, Markus Porer, Michael eng Demsar, Jure deposit-license Bernhard, Christian Huber, Rupert 2013-02-13T09:34:33Z The interplay among charge, spin and lattice degrees of freedom in solids gives rise to intriguing macroscopic quantum phenomena such as colossal magnetoresistance, multiferroicity and high-temperature superconductivity. Strong coupling or competition between various orders in these systems presents the key to manipulate their functional properties by means of external perturbations such as electric and magnetic fields or pressure. Ultrashort and intense optical pulses have emerged as an interesting tool to investigate elementary dynamics and control material properties by melting an existing order. Here, we employ few-cycle multi-terahertz pulses to resonantly probe the evolution of the spin-density-wave (SDW) gap of the pnictide compound BaFe(2)As(2) following excitation with a femtosecond optical pulse. When starting in the low-temperature ground state, optical excitation results in a melting of the SDW order, followed by ultrafast recovery. In contrast, the SDW gap is induced when we excite the normal state above the transition temperature. Very surprisingly, the transient ordering quasi-adiabatically follows a coherent lattice oscillation at a frequency as high as 5.5 THz. Our results attest to a pronounced spin-phonon coupling in pnictides that supports rapid development of a macroscopic order on small vibrational displacement even without breaking the symmetry of the crystal. Kim, Kyung Wan Schäfer, Hanjo Kim, Kyung Wan Bernhard, Christian Wolf, Thomas Leitenstorfer, Alfred 2012-06 Beyer, Markus Nature Materials ; 11 (2012), 6. - S. 497-501 2013-02-13T09:34:33Z Pashkin, Oleksiy Porer, Michael Pashkin, Oleksiy Huber, Rupert Schäfer, Hanjo

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