Nematic transition and highly two-dimensional superconductivity in BaTi_2Bi_2O revealed by ~(209)Bi-nuclear magnetic resonance/nuclear quadrupole resonance measurements

Shunsaku Kitagawa; Kenji Ishida; Wataru Ishii; Takeshi Yajima; Zenji Hiroi

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Nematic transition and highly two-dimensional superconductivity in BaTi_2Bi_2O revealed by ~(209)Bi-nuclear magnetic resonance/nuclear quadrupole resonance measurements

机译：BATI_2BI_2O中的向甲型过渡和高度二维超导〜〜（209）双核磁共振/核四极谐振谐振测量

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In this Rapid Communication, a set of ~(209)Bi-nuclear magnetic resonance (NMR)/nuclear quadrupole resonance (NQR) measurements has been performed to investigate the physical properties of superconducting (SC) BaTi_2Bi_2O from a microscopic point of view. The NMR and NQR spectra at 5 K can be reproduced with a nonzero in-plane anisotropic parameter η, indicating the breaking of the in-plane fourfold symmetry at the Bi site without any magnetic order, i.e., "the electronic nematic state." In the SC state, the nuclear spin-lattice relaxation rate divided by temperature, 1/T_1T , does not change even below T_c, while a clear SC transition was observed with a diamagnetic signal. This observation can be attributed to the strong two dimensionality in BaTi_2Bi_2O. Comparing the NMR/NQR results among BaTi_2Pn_2O (Pn = As, Sb, and Bi), it was found that the normal and SC properties of BaTi_2Bi_2O were considerably different from those of BaTi_2Sb_2O and BaTi_2As_2O, which might explain the two-dome structure of T_c in this system.

机译：在这种快速通信中，已经进行了一组〜（209）双核磁共振（NMR）/核四极杆谐振（NQR）测量，以研究来自微观的观点的超导（SC）BATI_2BI_2O的物理性质。在5 k下，可以用非单面内各向异性参数η再现NMR和NQR光谱，表明在BI站点的平面内四倍对称性的破裂而没有任何磁级，即“电子向导状态”。在SC状态下，核旋转晶格弛豫速率除以温度，1 / T_1T，甚至不低于T_C，而用抗磁信号观察到清晰的SC转换。这种观察可以归因于BATI_2BI_2O中的强两维度。比较BATI_2PN_2O（PN = AS，SB和BI）之间的NMR / NQR结果，发现BATI_2BI_2O的正常和SC属性与BATI_2SB_2O和BATI_2AS_2O的正常和SC属性可能解释T_C的双圆顶结构在这个系统中。

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来源
《Physical review, B》 |2018年第22期|共5页
作者
Shunsaku Kitagawa; Kenji Ishida; Wataru Ishii; Takeshi Yajima; Zenji Hiroi;
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作者单位

Department of Physics Kyoto University Kyoto 606-8502 Japan;

Department of Physics Kyoto University Kyoto 606-8502 Japan;

Institute for Solid State Physics The University of Tokyo Kashiwa Chiba 277-8581 Japan;

Institute for Solid State Physics The University of Tokyo Kashiwa Chiba 277-8581 Japan;

Institute for Solid State Physics The University of Tokyo Kashiwa Chiba 277-8581 Japan;

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正文语种 eng
中图分类固体物理学;
关键词
Nematic transition; highly two-dimensional superconductivity; nuclear quadrupole resonance measurements;

机译：向阐述;高度二维超导性;核四边形谐振测量;

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1. Nematic transition and highly two-dimensional superconductivity in BaTi_2Bi_2O revealed by ~(209)Bi-nuclear magnetic resonance/nuclear quadrupole resonance measurements [J] . Shunsaku Kitagawa, Kenji Ishida, Wataru Ishii, Physical review, B . 2018,第22期

机译：BATI_2BI_2O中的向甲型过渡和高度二维超导〜〜（209）双核磁共振/核四极谐振谐振测量
2. Unconventional superconductivity induced by quantum critical fluctuations in hydrate cobaltate Na-x(H3O)(z)CoO2-yH(2)O - Relationship between magnetic fluctuations and superconductivity revealed by Co nuclear quadrupole resonance [J] . Ihara Y, Takeya H, Ishida K, Journal of the Physical Society of Japan . 2006,第12期

机译：水合物钴酸盐Na-x（H3O）（z）CoO2-yH（2）O中的量子临界涨落引起的非常规超导-Co核四极共振揭示的磁涨落与超导之间的关系
3. Relationship between magnetic fluctuations and superconductivity in Na-x(H3O)(z)CoO2 center dot yH(2)O revealed by a Co nuclear quadrupole resonance [J] . Ishida K, Ihara Y, Takeya H, Physica, C. Superconductivity and its applications . 2007,第1期

机译：Co核四极共振揭示Na-x（H3O）（z）CoO2中心点yH（2）O中的磁涨落与超导之间的关系
4. Serious discrepancies between nuclear magnetic resonance and neutron scattering measurements in the critical region of classic two-dimensional magnets and anomalous behaviors at low temperatures [C] . N.Bykovetz, J. Klein, C.L.Lin Annual Conference on Magnetism Magnetic Materials . 2011

机译：核磁共振与中子散射测量在经典二维磁体的临界区域和低温下的异常行为之间的严重差异
5. SODIUM-23 QUADRUPOLE RELAXATION MEASUREMENTS BY COMPUTER-CONTROLLED DOUBLE NUCLEAR MAGNETIC RESONANCE SPECTROMETER. [D] . SPENCER, PAUL ANTHONY. 1976

机译：用计算机控制的双核磁共振波谱仪测量SODIUM-23四极弛豫。
6. Phospholipid packing and conformation in small vesicles revealed by two-dimensional 1H nuclear magnetic resonance cross-relaxation spectroscopy. [O] . Z C Xu, D S Cafiso 1986

机译：二维1H核磁共振交叉弛豫光谱法揭示了小囊泡中的磷脂堆积和构象。
7. Unconventional Superconductivity Induced by Quantum Critical Fluctuations in Hydrate Cobaltate Na$_{x}$(H$_3$O)$_{z}$CoO$_{x}\cdot$ $y$H$_{2}$O -- Relationship between Magnetic Fluctuations and the Superconductivity Revealed by a Co Nuclear Quadrupole Resonance -- [O] . Ihara, Y., Takeya, H., Ishida, K., 2006

机译：量子临界引起的非常规超导电性水合物钴酸盐的波动Na $ _ {x} $（H $ _3 $ O）$ _ {z} $ CoO $ _ {x} \ cdot $ $ y $ H $ _ {2} $ O - 磁性波动与磁场之间的关系 Co核四极共振揭示的超导性 -

Nematic transition and highly two-dimensional superconductivity in BaTi_2Bi_2O revealed by ~(209)Bi-nuclear magnetic resonance/nuclear quadrupole resonance measurements

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