Magnetic order in lightly doped La_{2-x}Sr_{x}CuO_{4}

Details Magnetic order in lightly doped La_{2-x}Sr_{x}CuO_{4} Magnetic order in lightly doped La_{2-x}Sr_{x}CuO_{4}

2004-07-09

arxiv.org/abs/cond-mat/0407248v1

Phys. Rev. Lett. vol. 93, issue 2, page 027001, 2004

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 5 figures

Scientific paper

10.1103/PhysRevLett.93.027001

We study long wavelength magnetic excitations in lightly doped La_{2-x}Sr_{x}CuO_{4} (x < 0.03) detwinned crystals. The lowest energy magnetic anisotropy induced gap can be understood in terms of the antisymmetric spin interaction inside the antiferromagnetic (AF) phase. The second magnetic resonace, analyzed in terms of in-plane spin anisotropy, shows unconventional behavior within the AF state and led to the discovery of collective spin excitations pertaining to a field induced magnetically ordered state. This state persists in a 9 T field to more than 100 K above the N\'{e}el temperature in x = 0.01.

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