Evidence for a Square-Square Vortex Lattice Transition in a High-TcCuprate Superconductor,Physical Review Letters

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Evidence for a Square-Square Vortex Lattice Transition in a High-TcCuprate Superconductor
Physical Review Letters ( IF 8.1 ) Pub Date : 2022-08-02 , DOI: 10.1103/physrevlett.129.067001
D J Campbell ₁ , M Frachet ₁ , S Benhabib ₁ , I Gilmutdinov ₁ , C Proust ₁ , T Kurosawa ₂ , N Momono ₃ , M Oda ₂ , M Horio ₄ , K Kramer ₄ , J Chang ₄ , M Ichioka ₅ , D LeBoeuf ₁

Affiliation

Using sound velocity and attenuation measurements in high magnetic fields, we identify a new transition in the vortex lattice state of

{La}_{2 - x} {Sr}_{x} {CuO}_{4}

. The transition, observed in magnetic fields exceeding 35 T and temperatures far below zero field

T_{c}

, is detected in the compression modulus of the vortex lattice, at a doping level of

x = p = 0.17

. Our theoretical analysis based on Eilenberger’s theory of the vortex lattice shows that the transition corresponds to the long-sought 45° rotation of the square vortex lattice, predicted to occur in