@misc{MiaoLorenzanaSeiboldetal., author = {Miao, Hu and Lorenzana, Jos{\´e} and Seibold, G{\"o}tz and Peng, Yingying and Amorese, Andrea and Yakhou-Harris, Flora and Kummer, Kurt and Brookes, Nicholas B. and Konik, R. M. and Thampy, Vivek and Gu, G. D. and Ghiringhelli, Giacomo Claudio and Braicovich, Lucio and Dean, M. P. M.}, title = {High-temperature charge density wave correlations in La1.875Ba0.125CuO4 without spin-charge locking}, series = {Proceedings of the National Academy of Sciences of the United States of America PNAS}, volume = {114}, journal = {Proceedings of the National Academy of Sciences of the United States of America PNAS}, number = {47}, issn = {1091-6490}, doi = {10.1073/pnas.1708549114}, pages = {12430 -- 12435}, abstract = {Although all superconducting cuprates display charge-ordering tendencies, their low-temperature properties are distinct, impeding efforts to understand the phenomena within a single conceptual framework. While some systems exhibit stripes of charge and spin, with a locked periodicity, others host charge density waves (CDWs) without any obviously related spin order. Here we use resonant inelastic X-ray scattering to follow the evolution of charge correlations in the canonical stripe-ordered cuprate La1.875Ba0.125CuO4 across its ordering transition. We find that high-temperature charge correlations are unlocked from the wavevector of the spin correlations, signaling analogies to CDW phases in various other cuprates. This indicates that stripe order at low temperatures is stabilized by the coupling of otherwise independent charge and spin density waves, with important implications for the relation between charge and spin correlations in the cuprates.}, language = {en} } @misc{MiaoFumagalliRossietal., author = {Miao, Hu and Fumagalli, Roberto and Rossi, M. and Lorenzana, Jos{\´e} and Seibold, G{\"o}tz and Yakhou-Harris, Flora and Kummer, K. and Brookes, Nicholas B. and Gu, G. D. and Braicovich, Lucio and Ghiringhelli, Giacomo Claudio and Dean, M. P. M.}, title = {Formation of Incommensurate Charge Density Waves in Cuprates}, series = {Physical Review X}, volume = {9}, journal = {Physical Review X}, number = {3}, issn = {2160-3308}, doi = {10.1103/PhysRevX.9.031042}, pages = {031042-1 -- 031042-11}, abstract = {Although charge density waves (CDWs) are omnipresent in cuprate high-temperature superconductors, they occur at significantly different wave vectors, confounding efforts to understand their formation mechanism. Here, we use resonant inelastic x-ray scattering to investigate the doping- and temperature-dependent CDW evolution in La₂₋ₓBaₓCuO₄ (x=0.115-0.155). We discover that the CDW develops in two stages with decreasing temperature. A precursor CDW with a quasicommensurate wave vector emerges first at high temperature. This doping-independent precursor CDW correlation originates from the CDW phase mode coupled with a phonon and "seeds" the low-temperature CDW with a strongly doping-dependent wave vector. Our observation reveals the precursor CDW and its phase mode as the building blocks of the highly intertwined electronic ground state in the cuprates.}, language = {en} }