In House Publications

• Universal stripe symmetry of short-range charge density waves in cuprate superconductors
  Jaewon Choi, Jiemin Li, Abhishek Nag, Jonathan Pelliciari, Hannah Robarts, Charles C. Tam, Andrew Walters, Stefano Agrestini, Mirian Garcia-Fernandez, Dongjoon Song, Hiroshi Eisaki, Steve Johnston, Riccardo Comin, Hong Ding, Ke-Jin Zhou
  
  Advanced Materials,Oct 2023
  DOI: 10.1002/adma.202307515

• I21: an advanced high-resolution resonant inelastic X-ray scattering beamline at Diamond Light Source

  Ke-Jin Zhou, Andrew Walters, Mirian Garcia-Fernandez, Thomas Rice, Matthew Hand, Abhishek Nag, Jiemin Li, Stefano Agrestini, Peter Garland, Hongchang Wang, Simon Alcock, Ioana Nistea, Brian Nutter, Nicholas Rubies, Giles Knap, Martin Gaughran, Fajin Yuan, Peter Chang, John Emmins, George Howell

  Journal Of Synchrotron Radiation, 29Mar 2022
  DOI: 10.1107/S1600577522000601
   
• Quadrupolar magnetic excitations in an isotropic spin-1 antiferromagnet

  A. Nag, A. Nocera, S. Agrestini, M. Garcia-Fernandez, A. C. Walters, S.-W. Cheong, S. Johnston, K.-J. Zhou

  Nature Communications, 13Apr 2022
  DOI: 10.1038/s41467-022-30065-5
   
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  Charge density waves in infinite-layer NdNiO2 nickelates

  Charles C. Tam, Jaewon Choi, Xiang Ding, Stefano Agrestini, Abhishek Nag, Mei Wu, Bing Huang, Huiqian Luo, Peng Gao, Mirian Garcia-Fernandez, Liang Qiao, Ke-Jin Zhou

  Nature Materials, 572Aug 2022
  DOI: 10.1038/s41563-022-01330-1
   
• Correlation driven near-flat band Stoner excitations in a Kagome magnet

  Abhishek Nag, Yiran Peng, Jiemin Li, Stefano Agrestini, Hannah C. Robarts, Mirian Garcia-Fernandez, Andrew C. Walters, Qi Wang, Qiangwei Yin, Hechang Lei, Zhiping Yin, Ke-Jin Zhou

  Nature Communications, 13Nov 2022
  DOI: 10.1038/s41467-022-34933-y

• Unraveling the orbital physics in a canonical orbital system KCuF3

  J. Li, L. Xu, M. Garcia-Fernandez, A. Nag, H. C. Robarts, A. C. Walters, X. Liu, J. Zhou, K. Wohlfeld, J. Van Den Brink, H. Ding, K.-J. Zhou

  Physical Review Letters, 126Mar 2021
  DOI: 10.1103/PhysRevLett.126.106401
   
• Dynamical spin susceptibility in La2CuO4 studied by resonant inelastic x-ray scattering

  H. C. Robarts, M. Garcia-Fernandez, J. Li, A. Nag, A. C. Walters, N. E. Headings, S. M. Hayden, K.-J. Zhou

  Physical Review B, 103June 2021
  DOI: 10.1103/PhysRevB.103.224427

• Many-body physics of single and double spin-flip excitations in NiO

  A. Nag, H. C. Robarts, F. Wenzel, J. Li, H. Elnaggar, R.-P. Wang, A. Walters, M. Garcia-Fernandez, F. M. F. De Groot, M. W. Haverkort, K. Zhou

  Physical Review Letters, 124Feb 2020
  DOI: 10.1103/PhysRevLett.124.067202
   
• Multiorbital charge-density wave excitations and concomitant phonon anomalies in Bi2Sr2LaCuO6+δ

  Jiemin Li, Abhishek Nag, Jonathan Pelliciari, Hannah Robarts, Andrew Walters, Mirian Garcia-Fernandez, Hiroshi Eisaki, Dongjoon Song, Hong Ding, Steven Johnston, Riccardo Comin, Ke-Jin Zhou

  Proceedings Of The National Academy Of Sciences, 89June 2020
  DOI: 10.1073/pnas.2001755117
   
• hv2-concept breaks the photon-count limit of RIXS instrumentation

  Ke-Jin Zhou, Satoshi Matsuyama, Vladimir N. Strocov

  Journal Of Synchrotron Radiation, 27Sept 2020
  DOI: 10.1107/S1600577520008607
   
• Detection of acoustic plasmons in hole-doped lanthanum and bismuth cuprate superconductors using resonant inelastic X-ray scattering

  A. Nag, M. Zhu, M. Bejas, J. Li, H. C. Robarts, H. Yamase, A. N. Petsch, D. Song, H. Eisaki, A. C. Walters, M. Garcia-Fernandez, A. Greco, S. M. Hayden, K. Zhou

  Physical Review Letters, 125Dec 2020
  DOI: 10.1103/PhysRevLett.125.257002

• Anisotropic damping and wave vector dependent susceptibility of the spin fluctuations in La2-x Srx CuO4 studied by resonant inelastic x-ray scattering

  H. C. Robarts, M. Barthelemy, K. Kummer, Mirian Garcia-Fernandez, J. Li, A. Nag, A. C. Walters, K. Zhou, S. M. Hayden

  Physical Review B, 100Dec 2019
  DOI: 10.1103/PhysRevB.100.214510

• December 2019 - Anisotropic damping and wave vector dependent susceptibility of the spin fluctuations in La 2 − x Sr x CuO 4 studied by resonant inelastic x-ray scattering Physical Review B 100.
  H. C. Robarts, M. Barthelemy, K. Kummer, Mirian Garcia-Fernandez, J. Li, A. Nag, A. C. Walters, K. Zhou, S. M. Hayden
  10.1103/PhysRevB.100.214510

ABSTRACT 

We report high-resolution resonant inelastic x-ray scattering (RIXS) measurements of the collective spin fluctuations in three compositions of the superconducting cuprate system La2−xSrxCuO4. We have mapped out the excitations throughout much of the two-dimensional (h,k) Brillouin zone. The spin fluctuations in La2−xSrxCuO4 are found to be fairly well described by a damped harmonic oscillator model, thus our data allows us to determine the full wave vector dependence of the damping parameter. This parameter increases with doping and is largest along the (h,h) line, where it is peaked near (0.2,0.2). We have used a new procedure to determine the absolute wave vector dependent susceptibility for the doped compositions La2−xSrxCuO4(x=0.12,0.16) by normalizing our data to La2CuO4 measurements made with inelastic neutron scattering (INS). We find that the evolution with doping of the intensity of high-energy excitations measured by RIXS and INS is consistent. For the doped compositions, the wave vector dependent susceptibility is much larger at (14,14) than at (12,0). It increases rapidly along the (h,h) line towards the antiferromagnetic wave vector of the parent compound (12,12). Thus, the strongest magnetic excitations, and those predicted to favor superconductive pairing, occur towards the (12,12) position as observed by INS.