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High magnetic field ultrasound study of spin freezing in La1.88Sr0.12CuO4

Mehdi, Frachet

Abstract (englisch):
In the high-Tc cuprate La2−xSrxCuO4 (LSCO), sound velocity and attenuation measurements have recently been shown to be sensitive to the antiferromagnetic (AFM) glass phase [1], a glass-like spin freezing with antiferromagnetic correlations. Here we focus on the case of La1.88Sr0.12CuO4 [2] where this magnetic phase is the most prominent [3]. Our ultrasound data reveal classical signatures of spin freezing that are reinforced up to unexpectedly high magnetic fields. This indicates very strong competition between superconductivity and magnetic freezing, tuned by the magnetic field. Comparison between different acoustic modes points toward a bilinear coupling of B1g strain with the spin fluctuations, which suggest that they have a nematic character.

Zugehörige Institution(en) am KIT Institut für Quantenmaterialien und -technologien (IQMT)
Publikationstyp Vortrag
Publikationsdatum 16.03.2021
Sprache Englisch
Identifikator KITopen-ID: 1000131795
HGF-Programm 43.21.01 (POF IV, LK 01) Quantum Correlations in Condensed Matter
Veranstaltung APS March Meeting (2021), Online, 15.03.2021 – 19.03.2021
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