We are interested in the nature of magnetism in correlated materials such as complex oxides and how it relates to emergent phenomena such as high-temperature superconductivity. Our tool of choice for this is resonant inelastic x-ray scattering (RIXS), as illustrated in Fig. 1, in which a x-ray core hole resonance is used to couple x-rays to magnetism in order to measure collective magnetic excitations.

Figure 1: The resonant inelastic x-ray scattering (RIXS) process. The initial, intermediate, and final states are shown from left to right. Photons are represented as wavy red lines and electronic transitions are shown as green arrows. In this process spin excitations are created and their dispersion can be measured by determining the energy and momentum change of the photon.

Example papers

  1. Emergence of Spinons in Layered Trimer Iridate Ba4Ir3O10 Y. Shen, J. Sears, G. Fabbris, A. Weichselbaum, W. Yin, H. Zhao, D. G. Mazzone, H. Miao, M. H. Upton, D. Casa, R. Acevedo-Esteves, C. Nelson, A. M. Barbour, C. Mazzoli, G. Cao, and M. P. M. Dean Phys. Rev. Lett. 129, 207201 (2022) [Abs] [PDF] [HTML] [Supp]
  2. Role of Oxygen States in the Low Valence Nickelate La4Ni3O8 Y. Shen, J. Sears, G. Fabbris, J. Li, J. Pelliciari, I. Jarrige, Xi He, I. Bozovic, M. Mitrano, Junjie Zhang, J. F. Mitchell, A. S. Botana, V. Bisogni, M. R. Norman, S. Johnston, and M. P. M. Dean Phys. Rev. X 12, 011055 (2022) [Abs] [PDF] [HTML] [Supp] [BNL Press Release]
  3. Strong Superexchange in a d9-δ Nickelate Revealed by Resonant Inelastic X-Ray Scattering J. Q. Lin, P. Villar Arribi, G. Fabbris, A. S. Botana, D. Meyers, H. Miao, Y. Shen, D. G. Mazzone, J. Feng, S. G. Chiuzbăian, A. Nag, A. C. Walters, M. Garcı́a-Fernández, Ke-Jin Zhou, J. Pelliciari, I. Jarrige, J. W. Freeland, Junjie Zhang, J. F. Mitchell, V. Bisogni, X. Liu, M. R. Norman, and M. P. M. Dean Phys. Rev. Lett. 126, 087001 (2021) [Abs] [PDF] [HTML] [Supp]
  4. Anomalous magnetoresistance due to longitudinal spin fluctuations in a Jeff = 1/2 Mott semiconductor Lin Hao, Zhentao Wang, Junyi Yang, D. Meyers, Joshua Sanchez, Gilberto Fabbris, Yongseong Choi, Jong-Woo Kim, Daniel Haskel, Philip J. Ryan, Kipton Barros, Jiun-Haw Chu, M. P. M. Dean, Cristian D. Batista, and Jian Liu Nature Communications 10, 5301 (2019) [Abs] [PDF] [HTML] [Supp]
  5. Giant magnetic response of a two-dimensional antiferromagnet Lin Hao, D Meyers, Hidemaro Suwa, Junyi Yang, Clayton Frederick, Tamene R Dasa, Gilberto Fabbris, Lukas Horak, Dominik Kriegner, Yongseong Choi, Jong-Woo Kim, Daniel Haskel, Philip J. Ryan, Haixuan Xu, Cristian D. Batista, M. P. M. Dean, and Jian Liu Nature Physics 14, 806 (2018) [Abs] [HTML] [arXiv] [BNL Press Release] [UTK Press Release] [ANL Highlight]
  6. Imaging antiferromagnetic antiphase domain boundaries using magnetic Bragg diffraction phase contrast Min Gyu Kim, Hu Miao, Bin Gao, S-W Cheong, C Mazzoli, A Barbour, Wen Hu, SB Wilkins, Ian K Robinson, MPM Dean, and V. Kiryukhin Nature communications 9, 5013 (2018) [Abs] [PDF] [HTML] [Supp] [BNL Press Release]
  7. High-temperature charge density wave correlations in La1.875Ba0.125CuO4 without spin–charge locking H Miao, José Lorenzana, Götz Seibold, YY Peng, A Amorese, F Yakhou-Harris, K Kummer, NB Brookes, RM Konik, V Thampy, G. D. Gu, G. Ghiringhelli, L. Braicovich, and M. P. M. Dean Proceedings of the National Academy of Sciences 114, 12430–12435 (2017) [Abs] [PDF] [HTML] [Supp] [BNL Press Release]
  8. Doping dependence of collective spin and orbital excitations in the Spin-1 quantum antiferromagnet La2-xSrxNiO4 Observed by X rays G Fabbris, D Meyers, L Xu, VM Katukuri, L Hozoi, X Liu, ZY Chen, J Okamoto, T Schmitt, AC Uldry, B. Delley, G. D. Gu, D. Prabhakaran, A. T. Boothroyd, J. Brink, D. J. Huang, and M. P. M. Dean Phys. Rev. Lett. 118, (2017) [Abs] [PDF] [HTML] [Supp]
  9. Ultrafast energy and momentum resolved dynamics of magnetic correlations in photo-doped Mott insulator Sr2IrO4 MPM Dean, Yue Cao, X Liu, S Wall, D Zhu, Roman Mankowsky, V Thampy, XM Chen, JG Vale, D Casa, Jungho Kim, A. H. Said, P. Juhas, R. Alonso-Mori, J. M. Glownia, A. Robert, J. Robinson, M. Sikorski, S. Song, M. Kozina, H. Lemke, L. Patthey, S. Owada, T. Katayama, M. Yabashi, Yoshikazu Tanaka, T. Togashi, J. Liu, C. Rayan Serrao, B. J. Kim, L. Huber, C.-L. Chang, D. F. McMorrow, M. Först, and J. P. Hill Nature Materials 15, 601–605 (2016) [Abs] [PDF] [HTML] [arXiv] [Supp] [Featured in News and Views] [BNL Press Release]
  10. Insights into the high temperature superconducting cuprates from resonant inelastic X-ray scattering MPM Dean Journal of Magnetism and Magnetic Materials 376, 3–13 (2015) [Abs] [PDF] [HTML]
  11. Ferromagnetic Exchange Anisotropy from Antiferromagnetic Superexchange in the Mixed 3 d- 5 d Transition-Metal Compound Sr3CuIrO6 Wei-Guo Yin, X Liu, AM Tsvelik, MPM Dean, MH Upton, Jungho Kim, D Casa, A Said, T Gog, TF Qi, G. Cao, and J. P. Hill Phys. Rev. Lett. 111, 057202 (2013) [Abs] [PDF] [HTML] [Supp]
  12. High-energy magnetic excitations in the cuprate superconductor Bi2Sr2CaCu2O8+δ: towards a unified description of its electronic and magnetic degrees of freedom MPM Dean, AJA James, RS Springell, X Liu, C Monney, KJ Zhou, RM Konik, JS Wen, ZJ Xu, GD Gu, V. N. Strocov, T. Schmitt, and J. P. Hill Phys. Rev. Lett. 110, 147001 (2013) [Abs] [PDF] [HTML] [Supp]
  13. Persistence of magnetic excitations in La2-xSrxCuO4 from the undoped insulator to the heavily overdoped non-superconducting metal M. P. M. Dean, G. Dellea, R. S. Springell, F. Yakhou-Harris, K. Kummer, N. B. Brookes, X. Liu, Y.-J. Sun, J. Strle, T. Schmitt, and J. P. Hill Nature Materials 12 12, 1019–1023 (2013) [Abs] [PDF] [HTML] [arXiv] [Supp] [BNL Press Release]
  14. Spin excitations in a single La2CuO4 layer MPM Dean, RS Springell, C Monney, KJ Zhou, J Pereiro, I Božović, Bastien Dalla Piazza, HM Rønnow, E Morenzoni, J Van Den Brink, T. Schmitt, and J. P. Hill Nature Materials 11, 850–854 (2012) [Abs] [PDF] [HTML] [arXiv] [Supp] [BNL Press Release]