Giant suppression of phononic heat transport in a quantum magnet BiCu2PO6
Open accessAbstract
Thermal transport of quantum magnets has elucidated the nature of low energy elementary excitations and complex interplay between those excited states via strong scattering of thermal carriers. BiCu 2 PO 6 is a unique frustrated spin-ladder compound exhibiting highly anisotropic spin excitations that contain both itinerant and localized dispersion characters along the b- and a-axes respectively. Here, we investigate thermal conductivity κ of BiCu 2 PO 6 under high magnetic fields (H) of up to 30 tesla. A dip-feature in κ, located at ~15 K at zero-H along all crystallographic directions, moves gradually toward lower temperature (T) with increasing H, thus resulting in giant suppression by a factor of ~30 near the critical magnetic field of Hc ≅ 23.5 tesla. The giant H- and T-dependent suppression of κ can be explained by the combined result of resonant scattering of phononic heat carriers with magnetic energy levels and increased phonon scattering due to enhanced spin fluctuation at Hc, unequivocally revealing the existence of strong spin-phonon coupling. Moreover, we find an experimental indication that the remaining magnetic heat transport along the b-axis becomes almost gapless at the magnetic quantum critical point realized at Hc.
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The weak field dependence in κ above 20 T is similar to another spin gap system, BiCu2PO6, where κ is dramatically suppressed below the critical field of spin gap closure and becomes nearly constant above the critical field.
“The weak field dependence in κ above 20 T is similar to another spin gap system, BiCu 2 PO 6 , 44 where κ is dramatically suppressed below the critical field of the spin gap closure and becomes nearly constant above the critical field.”
From Simultaneous measurement of specific heat and thermal conductivity in pulsed magnetic fields (2023) · cites this paper as [44]
The Results section, “Giant suppression of thermal conductivity under magnetic field” (page unavailable), reports strong suppression of κ as the field approaches the critical field of about 23.5 T. It does not establish that κ becomes nearly constant above that field: at about 1.4 K, κ increases again above it, while at 5 K it remains strongly suppressed at 30 T. The paper’s reference to “constant behavior” concerns κmag/T as temperature varies at the critical field, not κ as field varies above it. (LLM, conf=0.86)
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Simultaneous measurement of specific heat and thermal conductivity in pulsed magnetic fields
Nomoto, T., Zhong, C., Kageyama, H., Suzuki, Y., Jaime, M., Hashimoto, Y., Katsumoto, S., Matsuyama, N., Dong, C., Matsuo, A., et al. (2023) · arXiv · doi:10.48550/arxiv.2302.01627 · Cited by 5 · see citing works
- Authors
- Jeon, B.-G., Koteswararao, B., Park, C. B., Shu, G. J., Riggs, S. C., Moon, E. G., Chung, S. B., Chou, F. C., & Kim, K. H.
- Affiliations
- Seoul National University (KR)
- National Taiwan University (TW)
- Florida State University (US)
- Korea Advanced Institute of Science and Technology (KR)
- Corresponding author
- Kim, Kee Hoon
- Venue
- Scientific Reports
- Published
- 2016-11-15
- Volume
- 6
- Issue
- 1
- Pages
- 36970-36970
- ISSN
- 2045-2322 (ISSN-L)
- PMC
- PMC5109484
- OpenAlex
- W2553967804
- Cited by
- 13
- References
- 0
- Citations by year
- 2026: 1 · 2025: 1 · 2023: 2 · 2020: 3 · 2019: 1 · 2018: 3 · 2017: 2
- FWCI
- 1.19
- Type
- journal article
- Language
- en
- Open access
- gold
- doi.org
- Locations
- Scientific Reports (publishedVersion, cc-by)
- PubMed Central (publishedVersion, cc-by)
- PubMed (publishedVersion)
- OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information) (submittedVersion)
- DigiNole (Florida State University) (submittedVersion)
- Funders
- National Science Foundation (0654118)
- U.S. Department of Energy (LANLF100)
- National High Magnetic Field Laboratory (DMR-0654118)
- National Science Council (NSC-102-2119-M-002-004)
- Ministry of Science, ICT and Future Planning (2016K1A4A391 4691, IBS-R009-Y1)
- Division of Materials Research (0654118, DMR-06-54118)
- Los Alamos National Laboratory
- State of Florida
- Topics
- Physical Sciences › Physics and Astronomy › Condensed Matter Physics › Advanced Condensed Matter Physics
- Physical Sciences › Materials Science › Materials Chemistry › Thermal properties of materials
- Physical Sciences › Physics and Astronomy › Condensed Matter Physics › Physics of Superconductivity and Magnetism
- Keywords
- BiCu2PO6, quantum magnets, thermal conductivity, spin-phonon coupling, spin ladder, frustrated magnetism, magnetic quantum critical point, high magnetic fields, spin fluctuations
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