开发了3万大气压和稀释制冷结合,8万大气压和液氦制冷结合的两种国际领先的核磁共振测量技术。近年来,借助于核磁共振在位置选择性和低能磁性探测的优势,开展对铁基超导和自旋阻挫等关联电子材料的磁学性质、超导机理和量子相变等方向的研究。主要进行非常规超导和量子磁性材料的核磁共振物性研究,迄今已发表70余篇SCI论文,论文含15篇PRL/PRX/NC,单篇引用100次以上的论文10篇,H-index为31。2012年获得国家基金委优秀青年基金项目资助。
近年来代表性工作
1)低维和阻挫量子磁性、量子相变
(1)在一维反铁磁依辛材料BaCo2V2O8的横场量子临界点中,发现具有E8代数态的量子态 (PRL 2021)。
(2)多三角晶格依辛反铁磁材料研究,首次在磁性材料中发现BKT相变的实验证据。(NC 2020)。
(3)在一维反铁磁材料SrCo2V2O8材料中,首次在低场下实现一维依辛型量子临界点(PRL 2019),为其更多物性研究开辟了新的途径。
(4)在自旋阻挫材料a-RuCl3中率先建立磁场下的相图,揭示磁场压制磁有序并诱导量子自旋液体态,以及该自旋液体态具有Dirac型的无能隙费米元激发特征(PRL, 2017)。
(5) 率先研究Ba8CoNb6O24并提出该材料可以作为首个理想的二维三角晶格海森堡反铁磁材料进行研究。提出该材料在零场可能具有量子自旋液体态,而高磁场下诱导磁有序量子相变[PRM 2018]。
2)超导材料
(1) 通过稀释制冷温度下的高压核磁共振研究,首次解出FeSe超导材料在高压下的条纹型磁结构(PRL,2016),促进了该材料微观作用模型的建立和对超导机理的理解。
(2) 把离子液体氢化的技术引入到铁基超导研究中,氢化产生的电子掺杂效应使FeSe类材料超导温度从8.5 K提高到42.5 K等,并用高敏感的氢核磁共振测量揭示了非常规超导性质,提供了电子掺杂和氢核磁共振研究的新思路(Science Bulletin,2018, ESI 高被引)。
(3) 在铁基超导材料中观察到非常规自旋单态配对 (PRL,2011),超导和磁有序微观共存(PRL,2012),以及自旋涨落和超导转变温度关联(PRL,2013)的实验结果等。
代表性论文
1. E8 Spectra of Quasi-One-Dimensional Antiferromagnet BaCo2V2O8 under Transverse Field, H. Zou , Y. Cui, X. Wang , Z. Zhang, J. Yang, G. Xu, A. Okutani, M. Hagiwara, M. Matsuda, G. Wang, Giuseppe Mussardo, K. Hódsági, M. Kormos, Z. He, S. Kimura,R. Yu, W. Yu*, Jie Ma*, and Jianda Wu*,
PHYSICAL REVIEW LETTERS 127, 077201 (2021). (引用6次)
2. Evidence of the Berezinskii-Kosterlitz-Thouless Phase in a Frustrated Magnet, Z. Hu#, Z. Ma#, Y.-D. Liao#, H. Li#, C. Ma, Y. Cui, Y. Shangguan, Z. Huang, Y. Qi*, W. Li*, Z. Y. Meng*, J. Wen*, and Weiqiang Yu*,
Nature Communications 11, 5631 (2020).(引用24次)
3. Quantum Criticality of the Ising-like Screw Chain Antiferromagnet SrCo2V2O8 in a Transverse Magnetic Field, Y. Cui, H. Zou, N. Xi, Zhangzhen He*, Y. X. Yang, L. Shu, G. H. Zhang, Z. Hu, T. Chen, Rong Yu, Jianda Wu* and Weiqiang Yu*,
PHYSICAL REVIEW LETTERS 123, 067203 (2019). (引用22次)
4. Protonation induced high-T-c phases in iron-based superconductors evidenced by NMR and magnetization measurements, Cui Yi#, Zhang Gehui, Li Haobo, Lin Hai, Zhu Xiyu, Wen Hai-Hu, Wang Guoqing, Sun Jinzhao, Ma Mingwei, Li Yuan, Gong Dongliang, Xie Tao, Gu Yanhong, Li Shiliang, Luo Huiqian, Yu Pu*, Yu Weiqiang*,
Science Bulletin 63 ,11-16 (2018) (引用36次).
5. Gapless Spin Excitations in the Field-Induced Quantum Spin Liquid Phase of α−RuCl3, Jiacheng Zheng#, Kejing Ran#, Tianrun Li, Jinghui Wang, Pengshuai Wang, Bin Liu, Zheng-Xin Liu, B. Normand, Jinsheng Wen*, and Weiqiang Yu*,
PHYSICAL REVIEW LETTERS 119, 227208 (2017) .(引用182次).
6. Pressure Induced Stripe-Order Antiferromagnetism and First-Order Phase Transition in FeSe, P. S. Wang, S. S. Sun, Y. Cui, W. H. Song, T. R. Li, Rong Yu, Hechang Lei, and Weiqiang Yu*,
PHYSICAL REVIEW LETTERS 117, 237001 (2016)(引用69次).
7. Simultaneous Optimization of Spin Fluctuations and Superconductivity under Pressure in an Iron-Based Superconductor, G. F. Ji, J. S. Zhang, Long Ma, P. Fan, P. S. Wang, J. Dai, G. T. Tan, Y. Song, C. L. Zhang, Pengcheng Dai, B. Normand, and W. Yu*,
PHYSICAL REVIEW LETTERS 111, 107004 (2013). (引用23次)
8. Microscopic coexistence of superconductivity and antiferromagnetism in underdoped Ba(Fe1-xRux)2As2, L. Ma, G. F. Ji, Jia Dai, X. R. Lu, M. J. Eom, J. S. Kim, B. Normand, W. Yu*,
PHYSICAL REVIEW LETTERS 109, 197002 (2012).(引用30次)
9. 77Se NMR study of pairing symmetry and spin dynamics in KyFe2-xSe2, W. Yu*, L. Ma, J. B. He, D. M. Wang, T.-L. Xia, G. F. Chen, and W. Bao,
PHYSICAL REVIEW LETTERS 106, 197001 (2011).(引用74次)
10. Absence of superconductivity in single-phase CaFe2As2 under hydrostatic pressure, W. Yu, A. A. Aczel, T. J. Williams, S. L. Bud’ko, N. Ni, P. C. Canfield, and G. M. Luke,
Phys. Rev. B 79, 020511 (R) (2009). (引用205次)
11. Electron-lattice coupling and broken symmetries of the molecular salt (TMTTF)2SbF6, W. Yu, F. Zhang, F. Zamborszky, B. Alavi, A. Baur, C. A. Merlic, and S. E. Brown,
Phys. Rev. B. 70, 121101(R) (2004).(引用99次)
12. Phase Inhomogeneity of the Itinerant Ferromagnet MnSi at High Pressures, W. Yu, F. Zamborszky, J. D. Thompson, J. L. Sarrao, M. E. Torelli, Z. Fisk, and S. E. Brown,
PHYSICAL REVIEW LETTERS 92, 086403 (2004).(引用73次)