Journal
NATURE
Volume 595, Issue 7869, Pages 667+Publisher
NATURE PORTFOLIO
DOI: 10.1038/s41586021036978
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Angledependent magnetoresistance measurements of a strangemetal phase of a holedoped cuprate show a well defined Fermi surface and an isotropic linearintemperature scattering rate that saturates at the Planckian limit.
A variety of 'strange metals' exhibit resistivity that decreases linearly with temperature as the temperature decreases to zero(13), in contrast to conventional metals where resistivity decreases quadratically with temperature. This linearintemperature resistivity has been attributed to charge carriers scattering at a rate given by h/tau = alpha k(B)T, where alpha is a constant of order unity, h is the Planck constant and k(B) is the Boltzmann constant. This simple relationship between the scattering rate and temperature is observed across a wide variety of materials, suggesting a fundamental upper limit on scatteringthe 'Planckian limit'(4,5)but little is known about the underlying origins of this limit. Here we report a measurement of the angledependent magnetoresistance of La1.6xNd0.4SrxCuO4a holedoped cuprate that shows linearintemperature resistivity down to the lowest measured temperatures(6). The angledependent magnetoresistance shows a well defined Fermi surface that agrees quantitatively with angleresolved photoemission spectroscopy measurements(7) and reveals a linearintemperature scattering rate that saturates at the Planckian limit, namely alpha = 1.2 +/ 0.4. Remarkably, we find that this Planckian scattering rate is isotropic, that is, it is independent of direction, in contrast to expectations from 'hotspot' models(8,9). Our findings suggest that linearintemperature resistivity in strange metals emerges from a momentumindependent inelastic scattering rate that reaches the Planckian limit. Angledependent magnetoresistance measurements of a strangemetal phase of a holedoped cuprate show a well defined Fermi surface and an isotropic linearintemperature scattering rate that saturates at the Planckian limit.
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