From Antiferromagnetic Order to Static Magnetic Stripes: The Phase Diagram of(La,Eu)2−xSr

Abstract

The magnetic order of (La,Eu)2-xSrxCuO4 ( x</=0.2) has been investigated with &mgr;SR techniques. In this system a low temperature tetragonal (LTT) structure is present in the entire range of doping and it is possible to follow the evolution from the long range antiferromagnetic state at x = 0 to the static magnetic stripes. We find a nonmonotonic change of the Neel temperature with increasing x and the obtained magnetic phase diagram of the LTT phase resembles the generic phase diagram of the cuprates where the superconductivity is replaced by a second antiferromagnetic phase.

Cu nuclear magnetic resonance study of charge and spin stripe order inLa1.875Ba0.125CuO4

“…A fit of relation (2) to the data in Fig. 4 gives ∆ ≈ 80 K and T V F T ≈ 20 K (a pure activational dependence would have T V F T = 0); while the value of T V F T should be taken with caution due to the limited range of the fit, it is consistent with the temperatures where Cu spin freezing is observed 41,42 in LSCO and LESCO using µSR, with the temperature range where 139 La spin-lattice relaxation rates start to decrease 13 , and with the temperature where 2D superconductivity is formed through a Berezinski-Kosterlitz-Thouless transition 2 . We note that diverging relaxation times were also observed in early work on Cu NQR in LBCO powders 46 in a broadly similar temperature range.…”

Charge density wave in layeredLa1−xCexSb2

“…It has been argued that fluctuating CDWs can coexist with high-T C superconductivity, whereas static CDW has a tendency to compete with superconducting correlations [60]. The relationship with magnetic fluctuations has also been extensively discussed, but the observed differences in wave vectors and directions have not yet been reconciled [44,61]. Anomalous and inhomogeneous superconducting densities of states are ubiquitously found in many cuprates [62][63][64].…”

“…Condensation of CDW by disorder has been examined in Refs. [35,36,[44][45][46][47][48][49]. Pinning of the CDW bears some similarities to pinning of the vortex lattice in superconductors [50][51][52], and is discussed using the Fukuyama-Lee-Rice theory [53,54].…”

“…However, dynamic, or fluctuating, CDWs can be pinned by disorder [36,[44][45][46]. Condensation of CDW by disorder has been examined in Refs.…”

Stripe order in superconducting La2−xBaxCuOHücker1, Zimmermann2, Gu3 et al. 2011Phys. Rev. BSelf Cite304434112View full textAdd to dashboardCite

“…15 determined by ND are several times higher than the maximum bulk T c , with the caveat that truly static SO occurs at much lower temperatures, as confirmed by a number of µSR studies. 40,69,[81][82][83] The relatively low T c values, on the other hand, follow from a stronger suppression in the Nd-doped system. The substituion of La 3+ with the smaller Nd 3+ causes T c to go down even in the LTO phase, most likely as a consequence of the larger Φ.…”