Intra-unit-cell Magnetic Order in Stoichiometric La$_2$CuO$_4$
Vyacheslav G. Storchak, Jess H. Brewer, Dmitry G. Eshchenko, Patrick, W. Mengyan, Oleg E. Parfenov, Andrey M. Tokmachev, Pinder Dosanjh, Sergey N., Barilo
TL;DR
This study uses muon spin rotation and magnetization measurements to detect intra-unit-cell magnetic order in La$_2$CuO$_4$, supporting the circulating currents model of magnetism in high-$T_c$ cuprates.
Contribution
It provides experimental evidence for intra-unit-cell magnetic order in a stoichiometric high-$T_c$ parent compound, supporting the circulating currents hypothesis.
Findings
Detection of an additional magnetic field of about 45 G in La$_2$CuO$_4$
Support for the circulating currents model of intra-unit-cell magnetism
Confirmation of magnetic order in the high-$T_c$ parent compound
Abstract
Muon spin rotation measurements supported by magnetization experiments have been carried out in a stoichiometric high- parent compound LaCuO in %the a temperature range from 2~K to 340~K and in transverse magnetic fields up to 5~T. Along with the antiferromagnetic local field, muon spin rotation spectra indicate presence of an additional source of magnetic field on the muon. The characteristic splitting of about 45~G coming from this additional magnetic field is consistent with spontaneous circulating currents model of Varma.
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