Spin susceptibility of charge ordered YBa2Cu3Oy across the upper critical field
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arXiv
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| Main Authors: | , , , , , , , , , , , |
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| Format: | Preprint |
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2017
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| _version_ | 1866909134143619072 |
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| author | Zhou, R. Hirata, M. Wu, T. Vinograd, I. Mayaffre, H. Krämer, S. Reyes, A. P. Kuhns, P. L. Liang, R. Hardy, W. N. Bonn, D. A. Julien, M. -H. |
| author_facet | Zhou, R. Hirata, M. Wu, T. Vinograd, I. Mayaffre, H. Krämer, S. Reyes, A. P. Kuhns, P. L. Liang, R. Hardy, W. N. Bonn, D. A. Julien, M. -H. |
| contents | The value of the upper critical field Hc2, a fundamental characteristic of the superconducting state, has been subject to strong controversy in high-Tc copper-oxides. Since the issue has been tackled almost exclusively by macroscopic techniques so far, there is a clear need for local-probe measurements. Here, we use 17O NMR to measure the spin susceptibility $χ_{spin}$ of the CuO2 planes at low temperature in charge ordered YBa2Cu3Oy. We find that $χ_{spin}$ increases (most likely linearly) with magnetic field H and saturates above field values ranging from 20 to 40 T. This result is consistent with Hc2 values claimed by G. Grissonnanche et al. [Nat. Commun. 5, 3280 (2014)] and with the interpretation that the charge-density-wave (CDW) reduces Hc2 in underdoped YBa2Cu3Oy. Furthermore, the absence of marked deviation in $χ_{spin}(H)$ at the onset of long-range CDW order indicates that this Hc2 reduction and the Fermi-surface reconstruction are primarily rooted in the short-range CDW order already present in zero field, not in the field-induced long-range CDWorder. Above Hc2, the relatively low values of $χ_{spin}$ at T=2 K show that the pseudogap is a ground-state property, independent of the superconducting gap. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_1711_00109 |
| institution | arXiv |
| publishDate | 2017 |
| record_format | arxiv |
| spellingShingle | Spin susceptibility of charge ordered YBa2Cu3Oy across the upper critical field Zhou, R. Hirata, M. Wu, T. Vinograd, I. Mayaffre, H. Krämer, S. Reyes, A. P. Kuhns, P. L. Liang, R. Hardy, W. N. Bonn, D. A. Julien, M. -H. Superconductivity Strongly Correlated Electrons The value of the upper critical field Hc2, a fundamental characteristic of the superconducting state, has been subject to strong controversy in high-Tc copper-oxides. Since the issue has been tackled almost exclusively by macroscopic techniques so far, there is a clear need for local-probe measurements. Here, we use 17O NMR to measure the spin susceptibility $χ_{spin}$ of the CuO2 planes at low temperature in charge ordered YBa2Cu3Oy. We find that $χ_{spin}$ increases (most likely linearly) with magnetic field H and saturates above field values ranging from 20 to 40 T. This result is consistent with Hc2 values claimed by G. Grissonnanche et al. [Nat. Commun. 5, 3280 (2014)] and with the interpretation that the charge-density-wave (CDW) reduces Hc2 in underdoped YBa2Cu3Oy. Furthermore, the absence of marked deviation in $χ_{spin}(H)$ at the onset of long-range CDW order indicates that this Hc2 reduction and the Fermi-surface reconstruction are primarily rooted in the short-range CDW order already present in zero field, not in the field-induced long-range CDWorder. Above Hc2, the relatively low values of $χ_{spin}$ at T=2 K show that the pseudogap is a ground-state property, independent of the superconducting gap. |
| title | Spin susceptibility of charge ordered YBa2Cu3Oy across the upper critical field |
| topic | Superconductivity Strongly Correlated Electrons |
| url | https://arxiv.org/abs/1711.00109 |