Novel quantum spin liquid ground state in the trimer rhodate Ba$_4$NbRh$_3$O$_{12}$
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arXiv
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| Autori principali: | , , , , , , , , , , , , , , , , |
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| Natura: | Preprint |
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2024
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| author | Bandyopadhyay, Abhisek Lee, S. Adroja, D. T. Stenning, G. B. G. Berlie, Adam Lees, M. R. Saha, R. A. Takegami, D. Melendez-Sans, A. Poelchen, G. Yoshimura, M. Tsuei, K. D. Hu, Z. Kao, Cheng-Wei Huang, Yu-Cheng Chan, Ting-Shan Cho, Kwang-Yong |
| author_facet | Bandyopadhyay, Abhisek Lee, S. Adroja, D. T. Stenning, G. B. G. Berlie, Adam Lees, M. R. Saha, R. A. Takegami, D. Melendez-Sans, A. Poelchen, G. Yoshimura, M. Tsuei, K. D. Hu, Z. Kao, Cheng-Wei Huang, Yu-Cheng Chan, Ting-Shan Cho, Kwang-Yong |
| contents | Frustrated magnets offer a plethora of exotic magnetic ground states, including quantum spin liquids (QSLs), in which enhanced quantum fluctuations prevent a long-range magnetic ordering of the strongly correlated spins down to lowest temperature. Here we have investigated the trimer based mixed valence hexagonal rhodate Ba$_4$NbRh$_3$O$_{12}$ using a combination of dc and ac magnetization, electrical resistivity, specific heat, and muon spin rotation/relaxation ($μ$SR) measurements. Despite the substantial antiferromagnetic exchange interactions, as evident from the Weiss temperature ($θ_{\mathrm{W}}\sim -35$ to -45 K), among the Rh-local moments, neither long-range magnetic ordering nor spin-freezing is observed down to at least 50 mK, in ac-susceptibility, specific heat and ZF-$μ$SR measurements (down to 0.26 K). We ascribe the absence of any magnetic transition to enhanced quantum fluctuations as a result of geometrical frustration arising out of the edge-sharing equilateral Rh-triangular network in the structure. Our longitudinal-field $μ$SR result evidences persistent spin fluctuations down to 0.26~K, thus stabilizing a dynamic QSL ground state in Ba$_4$NbRh$_3$O$_{12}$. Furthermore, the magnetic specific heat ($C_{\mathrm{m}}$) data at low-$T$ reveal a significant $T$-linear contribution plus a quadratic $T$-dependence. A $T$-linear behavior is evocative of gapless spin excitations, while the $T^2$-term of $C_{\mathrm{m}}$ may indicate the Dirac QSL phenomenology of the spinon excitations with a linear dispersion. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2403_06446 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Novel quantum spin liquid ground state in the trimer rhodate Ba$_4$NbRh$_3$O$_{12}$ Bandyopadhyay, Abhisek Lee, S. Adroja, D. T. Stenning, G. B. G. Berlie, Adam Lees, M. R. Saha, R. A. Takegami, D. Melendez-Sans, A. Poelchen, G. Yoshimura, M. Tsuei, K. D. Hu, Z. Kao, Cheng-Wei Huang, Yu-Cheng Chan, Ting-Shan Cho, Kwang-Yong Strongly Correlated Electrons Materials Science Frustrated magnets offer a plethora of exotic magnetic ground states, including quantum spin liquids (QSLs), in which enhanced quantum fluctuations prevent a long-range magnetic ordering of the strongly correlated spins down to lowest temperature. Here we have investigated the trimer based mixed valence hexagonal rhodate Ba$_4$NbRh$_3$O$_{12}$ using a combination of dc and ac magnetization, electrical resistivity, specific heat, and muon spin rotation/relaxation ($μ$SR) measurements. Despite the substantial antiferromagnetic exchange interactions, as evident from the Weiss temperature ($θ_{\mathrm{W}}\sim -35$ to -45 K), among the Rh-local moments, neither long-range magnetic ordering nor spin-freezing is observed down to at least 50 mK, in ac-susceptibility, specific heat and ZF-$μ$SR measurements (down to 0.26 K). We ascribe the absence of any magnetic transition to enhanced quantum fluctuations as a result of geometrical frustration arising out of the edge-sharing equilateral Rh-triangular network in the structure. Our longitudinal-field $μ$SR result evidences persistent spin fluctuations down to 0.26~K, thus stabilizing a dynamic QSL ground state in Ba$_4$NbRh$_3$O$_{12}$. Furthermore, the magnetic specific heat ($C_{\mathrm{m}}$) data at low-$T$ reveal a significant $T$-linear contribution plus a quadratic $T$-dependence. A $T$-linear behavior is evocative of gapless spin excitations, while the $T^2$-term of $C_{\mathrm{m}}$ may indicate the Dirac QSL phenomenology of the spinon excitations with a linear dispersion. |
| title | Novel quantum spin liquid ground state in the trimer rhodate Ba$_4$NbRh$_3$O$_{12}$ |
| topic | Strongly Correlated Electrons Materials Science |
| url | https://arxiv.org/abs/2403.06446 |