Gapped magnetic ground state in the spin-liquid candidate $κ$-(BEDT-TTF)$_2$Ag$_2$(CN)$_3$ suggested by magnetic spectroscopy
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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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| _version_ | 1866911589677924352 |
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| author | Pal, Sudip Miksch, Björn von Nidda, Hans-Albrecht Krug Bauernfeind, Anastasia Scheffler, Marc Yoshida, Yukihoro Saito, Gunzi Kawamoto, Atsushi Mézière, Cécile Avarvari, Narcis Schlueter, John A. Pustogow, Andrej Dressel, Martin |
| author_facet | Pal, Sudip Miksch, Björn von Nidda, Hans-Albrecht Krug Bauernfeind, Anastasia Scheffler, Marc Yoshida, Yukihoro Saito, Gunzi Kawamoto, Atsushi Mézière, Cécile Avarvari, Narcis Schlueter, John A. Pustogow, Andrej Dressel, Martin |
| contents | The nature of the magnetic ground state of highly frustrated systems remained puzzling to this day. Here, we have performed multifrequency electron spin resonance (ESR) measurements on a putative quantum spin liquid compound $κ$-(BEDT-TTF)$_2$Ag$_2$(CN)$_3$, which is a rare example of $S = 1/2$ spins on a triangular lattice. At high temperatures, the spin susceptibility exhibits a weak temperature dependence which can be described by the Heisenberg model with an antiferromagnetic exchange interaction of strength $J/k_B \approx 175$ K. At low temperatures, however, the rapid drop of the static spin susceptibility, together with monotonic decrease of the ESR linewidth indicates that strong singlet correlations develop below a pairing energy scale $T^*$ accompanied by a spin gap. On the other hand, a weak Curie-like spin susceptibility and the angular dependence of the linewidth suggest additional contribution from impurity spins. We propose the gradual formation of spin singlets with an inhomogeneous spin gap at low temperatures. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2410_04104 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Gapped magnetic ground state in the spin-liquid candidate $κ$-(BEDT-TTF)$_2$Ag$_2$(CN)$_3$ suggested by magnetic spectroscopy Pal, Sudip Miksch, Björn von Nidda, Hans-Albrecht Krug Bauernfeind, Anastasia Scheffler, Marc Yoshida, Yukihoro Saito, Gunzi Kawamoto, Atsushi Mézière, Cécile Avarvari, Narcis Schlueter, John A. Pustogow, Andrej Dressel, Martin Strongly Correlated Electrons The nature of the magnetic ground state of highly frustrated systems remained puzzling to this day. Here, we have performed multifrequency electron spin resonance (ESR) measurements on a putative quantum spin liquid compound $κ$-(BEDT-TTF)$_2$Ag$_2$(CN)$_3$, which is a rare example of $S = 1/2$ spins on a triangular lattice. At high temperatures, the spin susceptibility exhibits a weak temperature dependence which can be described by the Heisenberg model with an antiferromagnetic exchange interaction of strength $J/k_B \approx 175$ K. At low temperatures, however, the rapid drop of the static spin susceptibility, together with monotonic decrease of the ESR linewidth indicates that strong singlet correlations develop below a pairing energy scale $T^*$ accompanied by a spin gap. On the other hand, a weak Curie-like spin susceptibility and the angular dependence of the linewidth suggest additional contribution from impurity spins. We propose the gradual formation of spin singlets with an inhomogeneous spin gap at low temperatures. |
| title | Gapped magnetic ground state in the spin-liquid candidate $κ$-(BEDT-TTF)$_2$Ag$_2$(CN)$_3$ suggested by magnetic spectroscopy |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2410.04104 |