Probing Mixed Valence States by Nuclear Spin-Spin Relaxation Time Measurements
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arXiv
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| Autori principali: | , , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| _version_ | 1866909553436655616 |
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| author | Ihara, Yoshihiko Shimohashi, Masakazu Kriener, Markus |
| author_facet | Ihara, Yoshihiko Shimohashi, Masakazu Kriener, Markus |
| contents | Several elements in the periodic table exhibit an interesting and often overlooked feature: They skip certain valence states which is discussed in the field of superconductivity to be in favor of fostering higher transition temperatures $T_c$. However, from the experimental point of view, it is often deemed difficult to probe changes in the valence state. Here we demonstrate that the latter are accessible by the spin-spin relaxation rate $1/T_2$ in nuclear magnetic resonance. As target material, we chose the solid solution Ge$_{1-x}$In$_x$Te, where valence-skipping In induces superconductivity and changes its valence state as a function of $x$. We observe a strong enhancement in $1/T_2(x)$ and, most importantly, find that $1/T_2$ and $T_c$ exhibit a strikingly similar $x$ dependence. These results underline the importance of valence physics for the evolution of superconductivity in Ge$_{1-x}$In$_x$Te. A model based on a Ruderman-Kittel-Kasuya-Yosida type of interaction among the In nuclei is proposed which fully accounts for the experimental results. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2502_17833 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Probing Mixed Valence States by Nuclear Spin-Spin Relaxation Time Measurements Ihara, Yoshihiko Shimohashi, Masakazu Kriener, Markus Superconductivity Several elements in the periodic table exhibit an interesting and often overlooked feature: They skip certain valence states which is discussed in the field of superconductivity to be in favor of fostering higher transition temperatures $T_c$. However, from the experimental point of view, it is often deemed difficult to probe changes in the valence state. Here we demonstrate that the latter are accessible by the spin-spin relaxation rate $1/T_2$ in nuclear magnetic resonance. As target material, we chose the solid solution Ge$_{1-x}$In$_x$Te, where valence-skipping In induces superconductivity and changes its valence state as a function of $x$. We observe a strong enhancement in $1/T_2(x)$ and, most importantly, find that $1/T_2$ and $T_c$ exhibit a strikingly similar $x$ dependence. These results underline the importance of valence physics for the evolution of superconductivity in Ge$_{1-x}$In$_x$Te. A model based on a Ruderman-Kittel-Kasuya-Yosida type of interaction among the In nuclei is proposed which fully accounts for the experimental results. |
| title | Probing Mixed Valence States by Nuclear Spin-Spin Relaxation Time Measurements |
| topic | Superconductivity |
| url | https://arxiv.org/abs/2502.17833 |