Anomalously high quasiparticle thermal conductivity in the underdoped cuprate superconductor HgBa2CuO4+δ
Abstract
The single-layer cuprate superconductor HgBa2CuO4+δ (Hg1201) is an ideal candidate for investigating many properties of cuprates with minimal disorder and without the complication of multiple CuO2 layers. Here we measure the in-plane longitudinal thermal conductivity κ of underdoped Hg1201 (Tc = 76 K, p = 0.11) at dilution refrigerator temperatures to extract the nodal quasiparticle velocity ratio vF/vΔ. Assuming contributions from only a single line node per quadrant on the Fermi surface leads to a value of vF/vΔ = 23 ± 3, anomalously large compared to other cuprates at similar dopings. In conjunction with the anomalously high quasiparticle specific heat of Hg1201 in the normal state reported previously at a similar doping, this points to more than one Fermi surface sheet crossing the nodal line, suggesting the presence of more than the single small electron pocket detected by quantum oscillations.
Versions
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BibTeX
@misc{baglo2026anomalously,
title = {{Anomalously high quasiparticle thermal conductivity in the underdoped cuprate superconductor HgBa$_2$CuO$_4+δ$}},
author = {Jordan Baglo and Quentin Barthélemy and Étienne Lefrançois and Anne Forget and Dorothée Colson and Cyril Proust and Louis Taillefer},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2607.06332},
eprint = {2607.06332},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2607.06332},
}
RIS
TY - UNPB
TI - Anomalously high quasiparticle thermal conductivity in the underdoped cuprate superconductor HgBa_2CuO_4+δ
AU - Jordan Baglo
AU - Quentin Barthélemy
AU - Étienne Lefrançois
AU - Anne Forget
AU - Dorothée Colson
AU - Cyril Proust
AU - Louis Taillefer
PY - 2026
DA - 2026/10/13
PB - arXiv
DO - 10.48550/arxiv.2607.06332
UR - https://arxiv.org/abs/2607.06332
AB - The single-layer cuprate superconductor HgBa_2CuO_4+δ (Hg1201) is an ideal candidate for investigating many properties of cuprates with minimal disorder and without the complication of multiple CuO_2 layers. Here we measure the in-plane longitudinal thermal conductivity κ of underdoped Hg1201 (T_c = 76 K, p = 0.11) at dilution refrigerator temperatures to extract the nodal quasiparticle velocity ratio v_F/v_Δ. Assuming contributions from only a single line node per quadrant on the Fermi surface leads to a value of v_F/v_Δ = 23 ± 3, anomalously large compared to other cuprates at similar dopings. In conjunction with the anomalously high quasiparticle specific heat of Hg1201 in the normal state reported previously at a similar doping, this points to more than one Fermi surface sheet crossing the nodal line, suggesting the presence of more than the single small electron pocket detected by quantum oscillations.
ER -