Raman-active phonons and mode softening in superconducting HgBa2CuO4+δ
M. C. Krantz, C. Thomsen, Hj. Mattausch, M. Cardona
DOI 10.1103/PhysRevB.50.1165 · Physical Review B
Active bibliographic source — not scientific approval
Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.
Abstract
Polarized micro-Raman spectra of a single crystallite of HgBa2CuO4+δ have been measured and used to assign phonon modes of A1g and Eg symmetry intrinsic to the superconducting phase. Predictions of the peak positions, linewidths, and Raman cross sections from compounds with similar bonding, i.e., HgO, Y-124, and Y-123, are closely matched and suggest assignments of the high-frequency A1g modes at 592 and 568 cm−1 to apical oxygen stretch vibrations of the ideal structure and of a Cu or O defect (in the Hg plane). The low-frequency 168, 161, and 75 cm−1 modes are assigned to O and Ba vibrations of Eg,A1g and Eg symmetry, respectively. An anomaly in the phonon frequency and linewidth of the 568-cm−1 A1g mode is observed below Tc. If interpreted as a change in the phonon self-energy due to the onset of superconductivity, this behavior is consistent with a gap energy near 568 cm−1, i.e., 8.7kTc in HgBa2CuO4+δ and constitutes a first estimate of the superconducting gap in this material. The Raman tensor elements for the assigned A1g and Eg modes are given in absolute units.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| HgBa2CuO4+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 95 | Pressure not reported | onset |
Similar papers
Synthesis, structure, and properties of the high-temperature superconductor HgBa2CuO4+δ
similarity 0.95J. P. Hodges et al.
Source status unknown — claims are unverified
Demonstrating the model nature of the high-temperature superconductor HgBa2CuO4+δ
similarity 0.95Neven Barišić et al.
Source status unknown — claims are unverified
Doping-Dependent Photon Scattering Resonance in the Model High-Temperature Superconductor HgBa2CuO4+δ Revealed by Raman Scattering and Optical Ellipsometry
similarity 0.95Yuan Li et al.
Source status unknown — claims are unverified
Comparative study of the characteristic length scales and fields of Hg-based high-Tc superconductors
similarity 0.95J. R. Thompson et al.
Source status unknown — claims are unverified
Relaxation effects in the transition temperature of superconducting HgBa2CuO4+δ
similarity 0.95S. Sadewasser et al.
Source status unknown — claims are unverified
In situ temperature-dependent x-ray-absorption spectroscopic studies for the mercury-based superconductors
similarity 0.95Seong-Ju Hwang et al.
Source status unknown — claims are unverified