Anelastic relaxation and $^{139}$La NQR in La$_{2-x}$Sr$_x$CuO$_4$ around the critical Sr content x=0.02

A. Campana; M. Corti; A. Rigamonti; R. Cantelli; F. Cordero

doi:10.1007/s100510070076

paper

Anelastic relaxation and $^{139}$ La NQR in La $_{2 - x}$ Sr $_{x}$ CuO $_{4}$ around the critical Sr content x=0.02

arXiv:cond-mat/0005326 · doi:10.1007/s100510070076

Abstract

Anelastic relaxation and $^{139}$ La NQR relaxation measurements in La $_{2 - x}$ Sr $_{x}$ CuO $_{4}$ for Sr content x around 2 and 3 percent, are presented and discussed in terms of spin and lattice excitations and ordering processes. It is discussed how the phase diagram of La $_{2 - x}$ Sr $_{x}$ CuO $_{4}$ at the boundary between the antiferromagnetic (AF) and the spin-glass phase (x = 0.02) could be more complicate than previous thought, with a transition to a quasi-long range ordered state at T = 150 K, as indicated by recent neutron scattering data. On the other hand, the $^{139}$ La NQR spectra are compatible with a transition to a conventional AF phase around T = 50 K, in agreement with the phase diagram commonly accepted in the literature. In this case the relaxation data, with a peak of magnetic origin in the relaxation rate around 150 K at 12 MHz and the anelastic counterparts around 80 K in the kHz range, yield the first evidence in La $_{1.98}$ Sr $_{0.02}$ CuO $_{4}$ of freezing involving simultaneously lattice and spin excitations. This excitation could correspond to the motion of charged stripes.

arXiv comment10 pages, 8 figures

Anelastic relaxation and 139La NQR in La2−x​Srx​CuO4​ around the critical Sr content x=0.02

Abstract

Cited by in corpus (6)

Anelastic relaxation and $^{139}$ La NQR in La $_{2 - x}$ Sr $_{x}$ CuO $_{4}$ around the critical Sr content x=0.02