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CATEGORIES:Condensed Matter Physics Seminars
SUMMARY:T-linear resistivity from an isotropic Planckian s
cattering rate - Gaël Grissonnanche\, LASSP\, Corn
ell University\, Ithaca (USA)
DTSTART:20210604T130000Z
DTEND:20210604T140000Z
UID:TALK4590AT
URL:/talk/index/4590
DESCRIPTION:Perfectly T-linear resistivity is observed in a va
riety of strongly correlated metals close to a qua
ntum critical point [1] and has been attributed to
a scattering rate 1/τ of charge carriers that rea
ches the Planckian limit [2\,3]\, with ℏ/𝜏 = α 𝑘𝐵𝑇
where α is of order unity. While this relationshi
p is often inferred from simple estimates\, a T-li
near scattering rate has yet to be measured.\nTo d
irectly access the Planckian scattering rate\, we
measured the angle-dependent magnetoresistance (AD
MR) of Nd-LSCO at p = 0.24: a cuprate that demonst
rates T-linear resistivity over a wide temperature
range at the pseudogap critical point p* [4]. The
ADMR reveals a well-defined Fermi surface that pr
ecisely agrees with ARPES [5]. In addition\, we ex
tract a T-linear scattering rate that has the Plan
ckian value\, namely α = 1.2 ± 0.4. Remarkably\, t
his inelastic scattering rate is isotropic.\n\nNot
only our findings [6] extend the validity of the
semi-classical approach to explain the properties
of the strange metal phase\, but they also suggest
that T-linear resistivity in strange metals is th
e direct consequence of a T-linear scattering rate
\, that reaches the Planckian bound for all direct
ions of electron motion.\n\n[1] J. Zaanen\, SciPos
t Phys. 6\, 061 (2019).\n[2] J. A. N. Bruin et al.
\, Science 339\, 804 (2013)\n[3] A. Legros et a
l.\, Nat. Phys. 15\, 142 (2019)\n[4] R. Daou et al
.\, Nat. Phys. 5\, 31 (2009).\n[5] C. Matt et al.\
, Phys. Rev. B 92\, 134524 (2015)\n[6] G. Grissonn
anche et al.\, to appear in Nature\, arXiv: 2011.1
3054
LOCATION:https://bham-ac-uk.zoom.us/j/87537747290?pwd=QkFrM
StXS2UycTg0NGtxUnpBOHRWUT09
CONTACT:Dr Clifford W. Hicks
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