Mobility of holes and suppression of antiferromagnetic order inLa2−xSrx

M. Hücker

¹

,

V. Kataev

²

,

J. Pommer

³

et al.

Abstract

We have measured the static magnetic susceptibility and the resistivity of Zn (0рzр0.25) and Sr (0рx р0.03) doped La 2 CuO 4 . Our data clearly show that Zn impurities lead to an increase of the Néel temperature T N in weakly hole doped compounds. This increase of T N correlates with an increase of the resistivity. The analysis of our data strongly suggests that the hole mobility is the most important source for the strong suppression of antiferromagnetic order in La 2Ϫx Sr x CuO 4 . ͓S0163-1829͑99͒50102-1͔ RAPID COMMUNICATIONS R726PRB 59 M. HÜ CKER et al. RAPID COMMUNICATIONSPRB 59 R727 MOBILITY OF HOLES AND SUPPRESSION OF . . . RAPID COMMUNICATIONS R728PRB 59 M. HÜ CKER et al.

Magnetic heat transport inR2CuO4(R=La, Pr, Nd, Sm, Eu, and

“…However, the mobility of the holes strongly enhances the effect of charge-carrier doping, what is also reflected in a much stronger suppression of T N by Sr doping as compared to Zn doping. 41 As shown in the lower panel of Fig. 4, the magnitude of κ mag for the various nominally undoped La 2 CuO 4 crystals varies by about a factor of two.…”

Phenomenological model of high-Tc superconductivity: a MCS model

“…7 Study of the charge modulation has been become possible with the discovery that, for hole concentration of 1/8 per Cu atom, stripes can be pinned by the structural modulation induced by partial substitution of the ion Nd 3+ for La 3+ . 7 Recently, many experiments have been also provided evidence ( 63 Cu nuclear quadrupole resonance (NQR), 19 EXAFS, 20 x-ray, 21,22 muon-spinrotation (µSR) 23,24 and transport 22,25 measurements) for stripe correlations in pure or doped LSCO. Very recently, through neutron and x-ray diffraction and transport measurements on Nd-doped LSCO, it is showed that the charge stripes which order within the CuO 2 planes at low temperature are intrinsically metallic, contrary to what one would expect for conventional charge-density-wave (CDW) order.…”

Competing frustration and dilution effects on the antiferromagnetism inLa2−xSrxKorenblit1, Aharony2, Entin‐Wohlman3 1999Phys. Rev. B130110View full textAdd to dashboardCite

“…In contrast, the effect of Cu dilution by nonmagnetic Zn is much weaker. Like in percolation, the AFLRO persists at Zn concentration, z, as large as 25 % [4].…”

“…Recently, Hücker and coworkers [4] studied the phase diagram of La 2−x Sr x Cu 1−z Zn z O 4 , and found surprising results: It appears that the vacancies introduced by Zn doping weaken the destructive effect of holes (introduced by the Sr) on the AFLRO. E. g., in a sample with z = 15%, the critical concentration x c of the holes is approximately 3%, i.e.…”

“…[3]; z = 0.15: stars Ref. [4]. Figure 1 presents the universal plot of T N (x, z)/T N (0, z), from both Eqs.…”