Signature of spin-triplet exciton condensations in LaCoO${}_3$ at ultrahigh magnetic fields up to 600 T

Abstract

Bose-Einstein condensation of electron-hole pairs, exciton condensation, has been effortfully investigated since predicted 60 years ago. Irrefutable evidence has still been lacking due to experimental difficulties in verifying the condensation of the charge neutral and non-magnetic spin-singlet excitons. Whilst, condensation of spin-triplet excitons is a promising frontier because spin supercurrent and spin-Seebeck effects will be observable. A canonical cobaltite LaCoO${}_3$ under very high magnetic fields is a propitious candidate, yet to be verified. Here, we unveil the exotic phase diagram of LaCoO${}_3$ up to 600 T generated using the electromagnetic flux compression method and the state-of-the-art magnetostriction gauge. We found the continuous magnetostriction curves and a bending structure, which suggest the emergence of two distinct spin-triplet exciton condensates. By constructing a phenomenological model, we showed that quantum fluctuations of excitons are crucial for the field-induced successive transitions. The spin-triplet exciton condensation in a cobaltite, which is three-dimensional and thermally equilibrated, opens up a novel venue for spintronics technologies with spin-supercurrent such as a spin Josephson junction.

arXiv comment6 pages, 4 figures plus supplementary material

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Cited by in corpus (12)

• Excitonic Condensate in Flat Valence and Conduction Bands of Opposite Chirality
• Signature of spin-triplet exciton condensations in LaCoO${}_3$ at ultrahigh magnetic fields up to 600 T
• A New Era of Excitonic Insulators
• Signatures of a magnetic superstructure phase induced by ultrahigh magnetic fields in a breathing pyrochlore antiferromagnet
• A review on magnetic field induced spin crossover in LaCoO${}_3$ up to 600 T
• Quantized Hall conductance in graphene by nonperturbative magnetic-field-containing relativistic tight-binding approximation method
• Effects of magnetic fields and orbital angular momentum on excitonic condensation in two-orbital Hubbard model
• Spin-Triplet Excitonic Insulator in the Ultra-Quantum Limit of HfTe5
• X-ray free-electron laser observation of giant and anisotropic magnetostriction in $\beta$-O${}_2$ at 110 Tesla
• Magnetic field induced valence change in Eu(Co${}_{1-x}$Ni${}_x$)${}_2$P${}_2$ up to 60 T
• Electromagnetic response in dipole superfluids: vortex lattices and singular domain walls
• Magnetic-field effect on excitonic condensation emergent in extended Falicov-Kimball model