Stress-induced nematicity in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>EuFe</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>As</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>studied by Raman spectroscopy

Zhang, Weilu; Sefat, Athena S.; Ding, Hao; Richard, P.; Blumberg, G.

doi:10.1103/physrevb.94.014513

Cited by 11 publications

(9 citation statements)

References 33 publications

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“…Because the FQ order parameter is of B 1g symmetry [14], the energy and lifetime of the B 1g phonon mode are expected to exhibit anomalies across T Q due to electron-phonon coupling. Moreover, breaking of the four-fold rotational symmetry should split the two E g phonon modes [25]. However, as shown in the insets of Fig.…”

Section: Mode This Work Ins γmentioning

confidence: 93%

Lattice dynamics, crystal-field excitations, and quadrupolar fluctuations of YbRu2Ge2

Rosenberg

Fisher

et al. 2019

Phys. Rev. B

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We employ polarization resolved Raman scattering spectroscopy to study ferroquadrupolar (FQ) fluctuations and crystal-field (CF) excitations in YbRu2Ge2 heavy-fermion metal with FQ transition at TQ=10 K. We demonstrate that the electronic static Raman susceptibilities in quadrupolar symmetry channels exhibit nearly Curie law behavior, and that the electron-lattice coupling is essential for the FQ transition at TQ. We establish the CF level scheme of the Yb 3+ ground state 2 F 7/2 multiplet. We study the lattice dynamics and demonstrate coupling between CF transitions and phonon modes. arXiv:1902.02863v2 [cond-mat.str-el]

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Section: Mode This Work Ins γmentioning

confidence: 93%

Lattice dynamics, crystal-field excitations, and quadrupolar fluctuations of YbRu2Ge2

Rosenberg

Fisher

et al. 2019

Phys. Rev. B

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“…As SPT corresponds to ferroelasticity, external strains easily change the elastic property of crystals as proposed in the iron pnictide compound. 33) One of the samples was deformed owing to the wrong amount of force generated by a pair of tweezers. This mechanical weakness of (Ta 1−x V x ) 2 NiSe 5 is reflected in the small absolute value of transverse elastic constants C 55 and C 66 with the order of 10 9 J/m 3 .…”

Section: Methodsmentioning

confidence: 99%

Elastic Soft Mode and Electric Quadrupole Response in Excitonic Insulator Candidate (Ta$_{0.952}$V$_{0.048}$)$_2$NiSe$_5$: Contribution of Electron-Phonon Interaction

Kurihara,

Hirose,

Sano

et al. 2022

Preprint

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We performed ultrasonic measurements on (Ta 0.952 V 0.048 ) 2 NiSe 5 to investigate the contribution of acoustic phonons at the zone center to structural and possible excitonic transitions. The transverse elastic constant C 55 with irreducible representation B 2g exhibits softening over 90% above a transition temperature of T s = 280 K, indicating the soft mode of corresponding TA phonons. Our analysis based on the quadrupole response indicates that the electron-phonon interaction contributes to the excitonic transition in addition to the hybridization between the conduction and valence bands if the excitonic transition is realized.

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“…Previous experiments were performed on twinned crystals, 8,42,43 and the B 2g and B 3g modes were observed next to each other in a single spectrum. An equivalent result can be obtained in de-twinned samples by using x * y , x * x or RR polarizations where the x and y axes are simultaneously projected (along with the z axis).…”

Section: A Lattice Dynamicsmentioning

confidence: 99%

Interplay of lattice, electronic, and spin degrees of freedom in detwinned BaFe2As2 : A Raman scattering study

Baum¹,

Lü²,

Tomić³

et al. 2018

Phys. Rev. B

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We report results of Raman scattering experiments on twin-free BaFe2As2 with the main focus placed on understanding the influence of electronic and spin degrees of freedom on the lattice dynamics. In particular, we scrutinize the Eg modes and the As A1g mode. Each of the two Eg phonons in the tetragonal phase is observed to split into a B2g and a B3g mode upon entering the orthorhombic stripe-magnetic phase. The splitting amounts to approximately 10 cm −1 and less than 5 cm −1 for the low-and the high-energy Eg mode, respectively. The detailed study of the fully symmetric As mode using parallel incident and outgoing photon polarizations along either the antiferromagnetic or the ferromagnetic Fe-Fe direction reveals an anisotropic variation of the spectral weight with the energy of the exciting laser indicating a polarization-dependent resonance effect. Along with the experiments we present results from density functional theory calculations of the phonon eigenvectors, the dielectric function, and the Raman tensor elements. The comparison of theory and experiment indicates that (i) orbital-selective electronic correlations are crucial to understand the lattice dynamics and (ii) all phonon anomalies originate predominantly from the magnetic ordering and the corresponding reconstruction of the electronic bands at all energies.

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Stress-induced nematicity inEuFe2As2studied by Raman spectroscopy

Cited by 11 publications

References 33 publications

Lattice dynamics, crystal-field excitations, and quadrupolar fluctuations of YbRu2Ge2

Lattice dynamics, crystal-field excitations, and quadrupolar fluctuations of YbRu2Ge2

Elastic Soft Mode and Electric Quadrupole Response in Excitonic Insulator Candidate (Ta$_{0.952}$V$_{0.048}$)$_2$NiSe$_5$: Contribution of Electron-Phonon Interaction

Interplay of lattice, electronic, and spin degrees of freedom in detwinned BaFe2As2 : A Raman scattering study

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