Transition between heavy-fermion strange metal and quantum spin liquid in a 4d-electron trimer lattice
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arXiv
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| Autori principali: | , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2023
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| _version_ | 1866916265413574656 |
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| author | Zhao, Hengdi Zhang, Yu Schlottmann, Pedro Nandkishore, Rahul Cao, Gang |
| author_facet | Zhao, Hengdi Zhang, Yu Schlottmann, Pedro Nandkishore, Rahul Cao, Gang |
| contents | We present experimental evidence that a heavy Fermi surface consisting of itinerant, charge-neutral spinons underpins both heavy-fermion-strange-metal (without f electrons) and quantum-spin-liquid states in the 4d-electron trimer lattice, Ba4Nb1-xRu3+xO12 (|x| < 0.20). These two exotic states both exhibit an extraordinarily large entropy, a linear heat capacity extending into the milli-Kelvin regime, a linear thermal conductivity at low temperatures, and separation of charges and spins. Furthermore, the insulating spin liquid is a much better thermal conductor than the heavy-fermion-strange-metal that separately is observed to strongly violate the Wiedemann-Franz law. We propose that at the heart of this 4d system is a universal, heavy spinon Fermi surface that provides a unified framework for explaining the exotic phenomena observed throughout the entire series. The control of such exotic ground states provided by variable Nb concentration offers a new paradigm for studies of correlated quantum matter. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2305_01033 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Transition between heavy-fermion strange metal and quantum spin liquid in a 4d-electron trimer lattice Zhao, Hengdi Zhang, Yu Schlottmann, Pedro Nandkishore, Rahul Cao, Gang Strongly Correlated Electrons We present experimental evidence that a heavy Fermi surface consisting of itinerant, charge-neutral spinons underpins both heavy-fermion-strange-metal (without f electrons) and quantum-spin-liquid states in the 4d-electron trimer lattice, Ba4Nb1-xRu3+xO12 (|x| < 0.20). These two exotic states both exhibit an extraordinarily large entropy, a linear heat capacity extending into the milli-Kelvin regime, a linear thermal conductivity at low temperatures, and separation of charges and spins. Furthermore, the insulating spin liquid is a much better thermal conductor than the heavy-fermion-strange-metal that separately is observed to strongly violate the Wiedemann-Franz law. We propose that at the heart of this 4d system is a universal, heavy spinon Fermi surface that provides a unified framework for explaining the exotic phenomena observed throughout the entire series. The control of such exotic ground states provided by variable Nb concentration offers a new paradigm for studies of correlated quantum matter. |
| title | Transition between heavy-fermion strange metal and quantum spin liquid in a 4d-electron trimer lattice |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2305.01033 |