$B_{\rm 1g}$ phonon anomaly driven by Fermi surface instability at intermediate temperature in YBa$_2$Cu$_3$O$_{7-δ}$

Dongjin Oh; Dongjoon Song; Younsik Kim; Shigeki Miyasaka; Setsuko Tajima; Yunkyu Bang; Seung Ryong Park; Changyoung Kim

doi:10.1103/PhysRevLett.127.277001

paper

$B_{1g}$ phonon anomaly driven by Fermi surface instability at intermediate temperature in YBa $_{2}$ Cu $_{3}$ O $_{7 - δ}$

arXiv:2107.00891 · doi:10.1103/PhysRevLett.127.277001

Abstract

We performed temperature- and doping-dependent high-resolution Raman spectroscopy experiments on YBa $_{2}$ Cu $_{3}$ O $_{7 - δ}$ to study $B$ $_{1g}$ phonons. The temperature dependence of the real part of the phonon self-energy shows a distinct kink at $T = T_{B1g}$ above $T$ $_{c}$ due to softening, in addition to the one due to the onset of the superconductivity. $T$ $_{B1g}$ is clearly different from the pseudogap temperature with a maximum in the underdoped region. The region between $T$ $_{B1g}$ and $T$ $_{c}$ resembles that of superconducting fluctuation or charge density wave order. While the true origin of the $B$ $_{1g}$ phonon softening is not known, we can attribute it to a gap on the Fermi surface due to an electronic order. Our results may reveal the role of the $B$ $_{1g}$ phonon not only in the superconducting state but also in the intertwined orders in multilayer copper oxide high- $T$ $_{c}$ superconductors.

5 pages, 4 figures

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Thermal decoupling in high- $T_{c}$ cuprate superconductors

B1g​ phonon anomaly driven by Fermi surface instability at intermediate temperature in YBa2​Cu3​O7−δ​

Abstract

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$B_{1g}$ phonon anomaly driven by Fermi surface instability at intermediate temperature in YBa $_{2}$ Cu $_{3}$ O $_{7 - δ}$