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SUMMARY:The spin pseudogap quantum critical point of La$_{2-x}$Sr$_x$CuO$_
 4$ overlooked for nearly four decades due to the distribution of the NMR r
 elaxation rate $1/T_1$
DTSTART:20250516T120000Z
DTEND:20250516T130000Z
DTSTAMP:20260717T083700Z
UID:indico-event-17603@indico.psi.ch
CONTACT:zaher.salman@psi.ch
DESCRIPTION:Speakers: Takashi Imai (Department of Physics and Astronomy\, 
 McMaster University\, Canada)\n\nEnhanced quantum fluctuations near the ps
 eudogap quantum critical point (QCP) have long been suspected to be playin
 g the central role in the mechanism of high Tc superconductivity in cuprat
 es. However\, the nature of the quantum fluctuations near the QCP and the 
 exact hole concentration xQCP of the QCP have been controversial. The NMR/
 NQR relaxation rate 1/T1 is an ideal probe to tackle this issue\, because 
 it is sensitive to both paramagnetic spin fluctuations in the doped Mott i
 nsulator regime below xQCP and the excitations at the Fermi surface of the
  overdoped Fermi liquid regime. Nonetheless\, past NMR/NQR effort to shed 
 light on the quantum criticality of La2-xSrxCuO4 was hampered by the growi
 ng distributions in the magnitude of 1/T1 induced by the electronic inhomo
 geneity above the optimum doping level x ~ 0.16. In this talk\, I will exp
 lain how one can deduce the average relaxation rate 1/T1 along with its de
 nsity distribution function P(1/T1) based on the inverse Laplace transform
  analysis [1-3]\, and its application to the 63Cu NQR search of the spin p
 seudogap QCP in the 63Cu isotope enriched samples of La2-xSrxCuO4 [4]. Thi
 s ILT method\, in principle\, can replace the stretched exponential fit of
  the mSR relaxation rate as well [5].\n \n[1] P. M. Singer\, A. Arsenault
  et al.\, PRB 101\, 174508 (2020) and references therein.\n[2] J. Wang et 
 al.\, Nature Physics 17\, 1109 (2021).\n[3] W. Yuan\, J. Wang et al.\, npj
  Quantum Materials 7\, 120 (2022).\n[4] C. Janesiripanich\, A. Manilal\, J
 . Wang\, P. M. Singer and T. Imai\, unpublished (2025).\n[5] W. A. MacFarl
 ane et al.\, J. Phys.: Conf. Ser. 2462\, 012015 (2023)\n\nhttps://indico.p
 si.ch/event/17603/
LOCATION:SZ-WBGB/019
URL:https://indico.psi.ch/event/17603/
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