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000837907 1001_ $$0P:(DE-HGF)0$$aMittal, R.$$b0$$eCorresponding author
000837907 245__ $$aAnomalous phonons in CaFe 2 As 2 explored by inelastic neutron scattering3
000837907 260__ $$aBristol$$bIOP Publ.$$c2010
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000837907 520__ $$aExtensive inelastic neutron scattering measurements of phonons on a single crystal of CaFe2As2 allowed us to establish a fairly complete picture of phonon dispersions in the main symmetry directions. The phonon spectra were also calculated by density functional theory (DFT) in the local density approximation (LDA). There are serious discrepancies between calculations done for the optimized structure and experiment, because the optimised structure is not the ambient pressure structure but is very close to the "collapsed" structure reached at p = 3.5 kbar. However, if the experimental crystal structure is used the calculation gives correct frequencies of most phonons. The most important new result is that linewidths/frequencies of certain modes are larger/softer than predicted by DFT-LDA. We also observed strong temperature dependence of some phonons near the structural phase transition near 172 K. This behavior may indicate anomalously strong electron phonon coupling and/or anharmonicity, which may be important to the mechanism of superconductivity.
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000837907 7001_ $$0P:(DE-HGF)0$$aPintschovius, L.$$b1
000837907 7001_ $$0P:(DE-HGF)0$$aLamago, D.$$b2
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000837907 7001_ $$0P:(DE-HGF)0$$aBohnen, K-P$$b4
000837907 7001_ $$0P:(DE-HGF)0$$aReznik, D.$$b5
000837907 7001_ $$0P:(DE-HGF)0$$aChaplot, S. L.$$b6
000837907 7001_ $$0P:(DE-Juel1)130991$$aSu, Y.$$b7
000837907 7001_ $$0P:(DE-Juel1)130778$$aKumar, N.$$b8
000837907 7001_ $$0P:(DE-HGF)0$$aDhar, S. K.$$b9
000837907 7001_ $$0P:(DE-HGF)0$$aThamizhavel, A.$$b10
000837907 7001_ $$0P:(DE-Juel1)130572$$aBrückel, Thomas$$b11
000837907 773__ $$0PERI:(DE-600)2166409-2$$a10.1088/1742-6596/251/1/012008$$gVol. 251, p. 012008 -$$p012008 -$$tJournal of physics / Conference Series$$v251$$x1742-6596$$y2010
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