Signatures of two gaps in the spin susceptibility of a cuprate superconductor
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arXiv
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2024
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| author | Zhou, R. Vinograd, I. Hirata, M. Wu, T. Mayaffre, H. Krämer, S. Hardy, W. N. Liang, R. Bonn, D. A. Loew, T. Porras, J. Keimer, B. Julien, M. -H. |
| author_facet | Zhou, R. Vinograd, I. Hirata, M. Wu, T. Mayaffre, H. Krämer, S. Hardy, W. N. Liang, R. Bonn, D. A. Loew, T. Porras, J. Keimer, B. Julien, M. -H. |
| contents | A major obstacle to understanding high-Tc cuprates is that superconductivity precludes observing normal-state properties at low temperatures. One prime example is the normal-state spin susceptibility \c{hi}spin: although its decrease upon cooling far above Tc typifies pseudogap behavior, its behavior at low temperatures is generally unknown. Here, our measurements in high magnetic fields expose \c{hi}spin of YBa2Cu3Oy down to low temperatures. Even though superconductivity is suppressed by the field, we uncover two thermally-activated contributions alongside a residual \c{hi}spin(T=0) due to gapless excitations. We relate these two distinct gaps to short-range charge-density waves and to the formation of singlets as in certain quantum spin systems. Both phenomena thus contribute to the pseudogap at low temperature, supplementing short-lived antiferromagnetism that initiates pseudogap behavior at high temperatures. We therefore propose that the pseudogap ought to be regarded as a composite property and that, when not undergoing spin-stripe ordering, underdoped cuprates tend to form short-ranged spin singlets. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2402_02508 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Signatures of two gaps in the spin susceptibility of a cuprate superconductor Zhou, R. Vinograd, I. Hirata, M. Wu, T. Mayaffre, H. Krämer, S. Hardy, W. N. Liang, R. Bonn, D. A. Loew, T. Porras, J. Keimer, B. Julien, M. -H. Superconductivity Strongly Correlated Electrons A major obstacle to understanding high-Tc cuprates is that superconductivity precludes observing normal-state properties at low temperatures. One prime example is the normal-state spin susceptibility \c{hi}spin: although its decrease upon cooling far above Tc typifies pseudogap behavior, its behavior at low temperatures is generally unknown. Here, our measurements in high magnetic fields expose \c{hi}spin of YBa2Cu3Oy down to low temperatures. Even though superconductivity is suppressed by the field, we uncover two thermally-activated contributions alongside a residual \c{hi}spin(T=0) due to gapless excitations. We relate these two distinct gaps to short-range charge-density waves and to the formation of singlets as in certain quantum spin systems. Both phenomena thus contribute to the pseudogap at low temperature, supplementing short-lived antiferromagnetism that initiates pseudogap behavior at high temperatures. We therefore propose that the pseudogap ought to be regarded as a composite property and that, when not undergoing spin-stripe ordering, underdoped cuprates tend to form short-ranged spin singlets. |
| title | Signatures of two gaps in the spin susceptibility of a cuprate superconductor |
| topic | Superconductivity Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2402.02508 |