Welcome to a seminar with Emma Campillo Muñoz - Postdoctoral researcher at Université de Sherbrooke (Canada)
Title: Thermal Hall conductivity as a probe of the quasiparticle mean free path in cuprate superconductors
Speaker: Emma Campillo Muñoz - Postdoctoral researcher at Université de Sherbrooke (Canada)
When: 20 August 2025, 15:00–16:00 incl time for questions. There will be a mingle in the lounge afterwards with tea/coffee.
Where: LINXS, The Loop, Rydbergs torg 4, 224 84 Lund, with digital participation possibility (Zoom). Registered participants (online-only) will receive a Zoom link before the event.
Abstract
The thermal Hall conductivity κxy can be used to estimate the mean free path of d-wave quasiparticles in cuprate superconductors [1]. Here, we report measurements of κxy in a range of cuprates, including the single-layer HgBa2CuO6+δ (Hg1201), the bilayer cuprates YBa2Cu3Oy (YBCO) and Bi2Sr2CaCu2O8+δ (Bi2212), and the trilayer cuprate HgBa2Ca2Cu3O8+δ (Hg1223), the superconductor with the highest Tc. We extract the mean free path from our κxy data and find that Hg1223 exhibits a mean free path as long as that of the cleanest YBCO crystals, suggesting that outer planes play a protective role against disorder. By contrast, Bi2212 has a mean free path approximately ten times shorter than that of YBCO, indicating a much higher degree of disorder. Furthermore, we observe a cubic temperature dependence of the scattering rate in the cleanest superconductors (YBCO and Hg1223), in agreement with theoretical predictions for d-wave superconductors [2,3].
Our results highlight the effectiveness of the thermal Hall technique in probing quasiparticle scattering across different cuprate families.
[1] Zhang et al., Physical Review Letters 86, 890 (2001).
[2] Walker and Smith, Physical Review B 61, 11285 (2000).
[3] Duffy, Hirschfeld and Scalapino, Physical Review B 64, 224522 (2001).
Bio
Emma Campillo Muñoz completed her PhD at Lund University in 2022 and is now a postdoctoral researcher at the Université de Sherbrooke (Canada). Her research covers quantum materials, ranging from heavy fermions to cuprate superconductors, with a current focus on the thermal Hall effect.
Contact: Please contact josefin.martell@linxs.lu.se for any practical questions.
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