Yamaji effect in models of underdoped cuprates
arXiv:2510.13943 · doi:10.1103/wlyk-v88c
Abstract
Recent angle-dependent magnetoresistance measurements in underdoped cuprates have revealed compelling evidence for small hole pockets in the pseudogap regime, including observation of the Yamaji effect in HgBaCuO (Chan et al., Nature Physics 10.1038/s41567-025-03032-2 (2025)). A key distinction between theories is their predicted Fermi volumes, measured as fractions of the square lattice Brillouin zone: per pocket for spin density wave (SDW) versus for fractionalized Fermi liquid (FL*), where is the hole doping. We calculate the -axis magnetoresistance within the semiclassical Boltzmann formalism for both states, and using the ancilla layer model (ALM) for FL* in a single-band Hamiltonian. The results from the phase show good consistency with current experimental data. Conversely, the results for the SDW phase are highly sensitive to the ordering momentum along the -direction. An ordering vector of yields predictions that starkly disagree with the experiment. The only possibility for agreement within the SDW scenario is to assume an ordering momentum of . However, even in this specific case, the SDW scenario predicts a marginally smaller Yamaji angle at than the FL* theory, and a second Yamaji peak near in-plane angle , which was not observed in the experiment. In reality, the Néel ordering vector is likely uncorrelated between adjacent layers, so that there is no coherent interlayer transport of hole-pocket quasiparticles in the SDW scenario, and consequently no Yamaji effect. Our results support the FL* interpretation of Fermi arcs in the pseudogap phase, and establish Yamaji angle measurements as a discriminatory tool between theoretical models.
arXiv comment15 pages, 13 figures
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