engleski

Effects of in-plane stress on the spin order and dynamics in stoichiometrically doped La1.875Ba0.125CuO4

We report an extensive 139La and 17O NMR study of the spin dynamics under uniaxial strain with the external magnetic field aligned along [001] direction to avoid breaking the four-fold symmetry of the CuO2 planes. We find that even the moderate strain along [110] direction induces orthorhombic distortion which is detrimental to the formation of both SO and CO in the system. The 139La NMR spin-lattice relaxation rate consequently decreases. The system also exhibits unusual scaling with the applied strain. In contrast, no discernible change in either TSO or TCO is found when the strain is applied in [100] direction. We propose a free-energy model where the stripe formation is directly coupled to the orthorhombic distortion. We also applied a magnetic field in [110] direction to quench the spin degrees of freedom in CuO2 plane. The field expectedly couples to the spin system and the observed effect of the [110] orthorhombic strain is substantially diminished.

cuprates ; 1/8-LBCO ; uniaxial strain ; spin glass ; spin order ; nuclear magnetic resonance

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