Abstract
The single-layer perovskite cobaltates have attracted enormous attention due to the recent observation of hour-glass shaped magnetic excitation spectra which resemble the ones of the famous high-temperature superconducting cuprates. Here, we present an overview of our most recent studies of the spin and charge correlations in floating-zone grown cobaltate single crystals. We find that frustration and a novel kind of electronic and magnetic nano phase separation are intimately connected to the appearance of the hour-glass shaped spin excitation spectra. We also point out the difference between nano phase separation and conventional phase separation.
Highlights
The hour-glass magnetic excitation spectrum has fascinated physicists over years. This spectrum has been observed in high-temperature superconducting cuprates, and it is widely believed that fluctuating charge stripes are involved in the physics of these intriguing materials [1, 2]
Charge stripes Fermi surface effects have been proposed for the emergence of these hour-glass spectra in cuprates [3]
It is natural to expect the existence of charge stripe ordered phases in La5/3Sr1/3CoO4, with the note that the correlation length of these diagonal charge stripes was thought to be very low in the cobaltate corresponding to the broadness of the magnetic peaks
Summary
The hour-glass magnetic excitation spectrum has fascinated physicists over years. This spectrum has been observed in high-temperature superconducting cuprates, and it is widely believed that fluctuating charge stripes are involved in the physics of these intriguing materials [1, 2]. Keywords Magnetic excitation spectra · Hour-glass · Cobaltate · Cuprate · Superconductor · Neutron · Synchrotron This spectrum has been observed in high-temperature superconducting cuprates, and it is widely believed that fluctuating charge stripes are involved in the physics of these intriguing materials [1, 2].
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