Magnetoresistance Scaling Reveals Symmetries of the Strongly Correlated Dynamics in BaFe2(As1−xP

Abstract

The phenomenon of T −linear resistivity commonly observed in a number of strange metals has been widely seen as evidence for the breakdown of the quasiparticle picture of metals. This study shows that a recently discovered H/T scaling relationship in the magnetoresistance of the strange metal BaFe2(As1−xPx)2, is independent of the relative orientations of current and magnetic field. Rather, its magnitude and form depend only on the orientation of the magnetic field with respect to a single crystallographic axis: the direction perpendicular to the magnetic iron layers. This finding suggests that the magnetotransport scaling does not originate from the conventional averaging or orbital velocity of quasiparticles as they traverse a Fermi surface, but rather from dissipation arising from two-dimensional correlations.

Large magnetoresistance in the iron-free pnictide superconductor LaRu$_2$P$_2$

“…We observe no sign of saturation at high magnetic fields. The value of the magnetoresistance is very large, of about 35% at 22 T. This is of the same order as the magnetoresistance found in for example the optimally doped BaFe 2 (As 1−x P x ) 2 and La 2−x Sr x CuO 4 [1][2][3]. We do not observe a magnetoresistance which is exactly linear, as in those cases.…”

“…Magnetoresistance (MR) in unconventional high critical temperature superconductors such as cuprate and pnictide materials has been recently used as a measure of their unconventional electronic properties [1][2][3][4]. MR appears due to the changes in the electronic transport induced by the magnetic field (H), it is insensitive to a change in the direction of the applied magnetic field and therefore increases with an even power in H, which turns out to be H 2 in most cases.…”

“…MR appears due to the changes in the electronic transport induced by the magnetic field (H), it is insensitive to a change in the direction of the applied magnetic field and therefore increases with an even power in H, which turns out to be H 2 in most cases. Deviation from the H 2 behaviour towards linear magnetoresistance in optimally doped cuprates and pnictide superconductors has been interpreted as a signature of the strange metal state associated to the high T c in these materials [1][2][3]. The Fermi surface of the cuprates is particularly simple, with pockets at the corners of the Brillouin zone that evolve into arcs with doping into the superconducting state [5].…”

Possible scale invariant linear magnetoresistance in pyrochlore iridates Bi2Ir2O7

“…Recently, there are several reports of the observation of scale invariant linear magnetoresistance close to the quantum critical points in high temperature superconducting cuprates and iron pnictides [29][30][31][32]. From a phenomenological point of view, the MR of Bi 2 Ir 2 O 7 shows striking similarity to these two systems: the resistivity depends linearly on field as temperature approaches zero, and the zero-field temperature dependence of resistivity also becomes linear at high temperatures.…”

Visualizing dissipative charge-carrier dynamics at the nanoscale with superconducting-charge-qubit microscopy

“…Previous studies, some of them based on commercially available components, already demonstrated the feasibility of integrating scanning probe experiments into dilution refrigerator cryostats, while maintaining lowest mechanical vibrations and lowest electron temperatures [27,42,43], an aspect crucial to the operation of the CQ sensor. Yet, attention has to be paid to a proper thermalization and filtering of the DC lines needed for the scanning and device operation [43][44][45].…”