Lattice Instability of High-Transition-Temperature Superconductors. II. Single-Crystal<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">V</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>Si Results

Testardi, L. R.; Bateman, T. B.

doi:10.1103/physrev.154.402

Cited by 227 publications

(30 citation statements)

References 22 publications

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“…Many compounds, such as A-15 superconductors, Cd 2 Re 2 O 7 and BaTiO 3−δ , have been considered as potential ferroelectric metals [4][5][6] . But further experiments [7][8][9] have shown that the transitions in the compounds do not really meet the criteria proposed by Anderson and Blount. In 2013, Y. Shi et al reported 10 the first ferroelectriclike metal LiOsO 3 , in which a continuous structural phase transition from centrosymmetric R3c group to non-centrosymmetric R3c group, occurs at 140 K. Neutron and X-ray diffraction experiments demonstrate that the transition involves the continuous changes of average positions of Li atoms along the c axis, accompanying with a subtle displacement of oxygen atom. This kind of transition is usually seen in insulating compounds like LiNbO 3 and LiTaO 3 , etc., and consequently produces ferroelectricity.…”

Section: Introductionmentioning

confidence: 86%

Raman phonons in the ferroelectric-like metalLiOsO3

Jin

Zhang

et al. 2016

Phys. Rev. B

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The novel ferroelectric-like structural transition observed in metallic LiOsO3 [Y. Shi et al., Nat. Mater. 12, 1024(2013], has invoked many theoretical and experimental interests. In this work, we have performed polarized and temperature-dependent Raman scattering measurements on highquality single crystal LiOsO3 and identified Raman-active modes in both centrosymmetric phase (300 K, R3c) and non-centrosymmetric phase (10 K, R3c). Only four phonon peaks are observed in the former phase, while there are twelve peaks in the latter phase because of the reduction of crystal symmetry. With the help of careful symmetry analysis and first-principles calculations, we can make a systematic assignment for the observed Raman modes in both phases. The significant changes in line-width and the continuous evolution of Raman frequencies with temperatures were observed for the Eg modes around the transition temperature, which suggests that the ferroelectriclike structural transition is a continuous order-disorder transition. The result sheds light on the coexistence of ferroelectricity and metallicity in the compound.

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Section: Introductionmentioning

confidence: 86%

Raman phonons in the ferroelectric-like metalLiOsO3

Jin

Zhang

et al. 2016

Phys. Rev. B

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“…Large elastic anomalies compared with those of iron-based materials have been reported in the A15 superconductor V 3 Si and the Laves-phase superconductor CeRu 2 so far. 18,19) These anomalies have been ascribed to the large density of states at the Fermi energy. 3d orbitals form bands in an ironbased superconductor.…”

Section: Analysis Based On Band Picturementioning

confidence: 99%

Structural Quantum Criticality and Superconductivity in Iron-Based Superconductor Ba(Fe_1-xCo_x)₂As₂

et al. 2012

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We investigated the elastic properties of the iron-based superconductor Ba(Fe 1Àx Co x ) 2 As 2 with eight Co concentrations. The elastic constant C 66 shows a large elastic softening associated with structural phase transition. C 66 was analyzed on the basis of the localized and itinerant pictures of Fe-3d electrons, which shows a strong electronlattice coupling and a possible mass enhancement in this system. The results are similar to those of unconventional superconductors, where the properties of the system are governed by quantum fluctuations associated with the zerotemperature critical point of long-range order, namely, the quantum critical point (QCP). In this system, the inverse of C 66 behaves just like the magnetic susceptibility in magnetic QCP systems. Although the QCPs of these existing superconductors are all ascribed to antiferromagnetism, our systematic studies on the canonical iron-based superconductor Ba(Fe 1Àx Co x ) 2 As 2 have revealed that there is a signature of ''structural quantum criticality'' in this material, which thus far has had no precedent. The elastic constant anomaly is suggested to concern with the emergence of superconductivity. These results highlight the strong electron-lattice coupling and effect of the band in this system, thus challenging the prevailing scenarios that focus on the role of iron 3d orbitals.

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“…Using the same procedures as before for other proper FE martensites [13,22], one calculates from Refs. [23] and [24] a transformation strain of eo = 9.4 x and from Refs. [24] and [25] for the TB half-width 5, = 0.36 nm, both xfemd to the transformation temperature.…”

Section: Application To Vanadium Silicidementioning

confidence: 99%

“…For Cu, A1 and Pb experimental ultrasonic attenuation data have been accounted for in terms of separate contributions from the dislocation drag that is caused by phonon viscosity, elecmnic damping (dominant only at low temperatures) phonon scattering, and (for longitudinal modes) from the thermoelastic effect [26]. Interpretation of the attenuation data for V3Si [24] in this manner would require measurement of the frequency dependence of the attenuation as a function of temperam. Additional conmbutions from pretransfo&ation st&n modulations (tweed) observed in V3Si 1271 (as in many other thermoelastic martensites) above the transformation temperature are also to be expected.…”

Section: Application To Vanadium Silicidementioning

confidence: 99%

“…[24] and [25] for the TB half-width 5, = 0.36 nm, both xfemd to the transformation temperature. The TB width is only four times larger than the shortest interplanar distance in [I 101 and should decrease with decreasing temperature [13], suggesting the existence of a mobility threshold due to the Peierls harrier for T c T, Calculating q from the measured ultrasonic attenuation a [24] by means of the relation for the phonon viscosity model, a = q&/(2pv3) (where o = angular frequency and v, = sound velocity for a [110]/ [110] shear wave) gives for q (in dsec/m2) 0.015 at 300K, a maximum of 0.047 at 50K, and 0.032 at 25K, corresponding to a mobility value of about 104 m3/Nsec at T, . However, the values given for q are 103 to 104 times larger than theoretically calculated room temperature values for seven metals [15], so that the ultrasonic attenuation measured for V3Si is certainly not directly due to phonon viscosity.…”

Section: Application To Vanadium Silicidementioning

confidence: 99%

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Mobility of Domain Walls in Proper Ferroelastic Martensites

Barsch

1995

J. Phys. IV France

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Abstract. Based on the Landau-Ginzberg free energy functional for an Oh-D4h proper ferroelastic martensitic transformation the mobility of a (I 10) twin boundary in a large bicrystal has been calculated by including dissipation in the approximation of the phonon viscosity model and by solving the inverse boundary value problem for the limiting case of strong shear modulus softening. Application to actual materials requires determination of the phonon viscosity tensor from experimental ultrasonic attenuation or low frequency internal friction data after subtraction of "extrinsic" losses, especially those from pretransformation structural strain modulations ("tweed') and dislocations. Numerical application to V3Si, the only proper fenoelastic martensite for which such experimental data pertaining to the soft [I 10]/[1TO] shear mode are available, is discussed.

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Lattice Instability of High-Transition-Temperature Superconductors. II. Single-CrystalV3Si Results

Cited by 227 publications

References 22 publications

Raman phonons in the ferroelectric-like metalLiOsO3

Raman phonons in the ferroelectric-like metalLiOsO3

Structural Quantum Criticality and Superconductivity in Iron-Based Superconductor Ba(Fe_1-xCo_x)₂As₂

Mobility of Domain Walls in Proper Ferroelastic Martensites

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Lattice Instability of High-Transition-Temperature Superconductors. II. Single-CrystalV3Si Results

Cited by 227 publications

References 22 publications

Raman phonons in the ferroelectric-like metalLiOsO3

Raman phonons in the ferroelectric-like metalLiOsO3

Structural Quantum Criticality and Superconductivity in Iron-Based Superconductor Ba(Fe1-xCox)2As2

Mobility of Domain Walls in Proper Ferroelastic Martensites

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Structural Quantum Criticality and Superconductivity in Iron-Based Superconductor Ba(Fe_1-xCo_x)₂As₂