Magnetic excitations and interactions

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.



  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)
  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)
    [BNL Press Release]


  1. 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)


  1. 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)


  1. 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)
    [BNL Press Release] [UTK Press Release] [ANL Highlight]
  2. 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)
    [BNL Press Release]


  1. 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)
    [BNL Press Release]
  2. 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)


  1. 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)
    [Featured in News and Views] [BNL Press Release]


  1. 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)


  1. 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)
  2. 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)
  3. 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)
    [BNL Press Release]


  1. 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)
    [BNL Press Release]