Magnetic phase diagram of lightly doped<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">La</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn><mml:mi mathvariant="normal">−</mml:mi><mml:mi mathvariant="italic">x</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Sr</mml:mi></mml:mrow><mml:mrow><m

Chou, F. C.; Borsa, F.; Cho, J. H.; Johnston, D. C.; Lascialfari, A.; Torgeson, D. R.; Zioło, J.

doi:10.1103/physrevlett.71.2323

Cited by 166 publications

(135 citation statements)

References 20 publications

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“…24,29 It has been found that a static internal field, determined from both 139 La NQR and µSR, develops below T N with a further increase at T ∼30 K, and the latter temperature does not depend on the hole concentration. The two characteristic temperatures are consistent with those determined from our neutron scattering studies.…”

Section: Discussionmentioning

confidence: 99%

Electronic phase separation in lightly dopedLa2−xSrxCu
Matsuda
¹
,
Fujita
²
,
Yamada
³

et al. 2002
Phys. Rev. B
173
19
159
2
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The hole concentration dependence of the magnetic correlations is studied in very lightly-doped La2−xSrxCuO4 (x <0.02), which shows coexistence of a three-dimensional antiferromagnetic (AF) long-range ordered phase and a spin-glass phase at low temperatures. It is found that the spin-glass phase in the coexistence region also shows a diagonal spin modulation as in the pure spin-glass phase in La2−xSrxCuO4 (0.02≤ x ≤0.055). Below x ∼0.02 the diagonal stripe structure is the same as that in x ∼0.02 with a volume fraction almost proportional to hole concentration, suggesting that electronic phase separation of the doped holes occurs so that some regions with hole concentration c h ∼0.02 and the rest with c h ∼0 are formed. This represents the most direct observation to-date of electronic phase separation in lightly-doped antiferromagnets. Such phase separation has been predicted by a number of theories.

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Section: Discussionmentioning

confidence: 99%

Electronic phase separation in lightly dopedLa2−xSrxCu
Matsuda
¹
,
Fujita
²
,
Yamada
³

et al. 2002
Phys. Rev. B
173
19
159
2
View full text Add to dashboard Cite

show abstract

“…12 It is also reported that spin glass freezing temperature determined by the 139 La NQR measurements in this region is proportional to 1/x. 13 Very recently, Wakimoto et al 14 found that the quasi-static magnetic order for x = 0.05 has an incommensurate structure whose modulation vector is along the orthorhombic b-axis, ∼ 45 • away from the incommensurate modulation observed in superconducting samples. Furthermore, an extensive study by Matsuda et al 15 has revealed that the same type of incommensurate spin structure exists throughout the hole concentration range 0.024 ≤ x ≤ 0.05.…”

Section: Introductionmentioning

confidence: 99%

Systematic study of short-range antiferromagnetic order and the spin-glass state in lightly dopedLa2−xSrx

et al. 2000

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Systematic measurements of the magnetic susceptibility were performed on single crystals of lightly doped La2−xSrxCuO4 (x = 0.03, 0.04 and 0.05). For all samples the temperature dependence of the in-plane magnetic susceptibility shows typical spin-glass features with spin-glass transition temperatures Tg of 6.3 K, 5.5 K and 5.0 K for x = 0.03, 0.04 and 0.05, respectively. The canonical spin-glass order parameter extracted from the in-plane susceptibility of all the samples follows a universal scaling curve. On the other hand, the out-of-plane magnetic susceptibility deviates from Curie law below a temperature T dv , higher than Tg. Comparing with previous neutron scattering results with an instrumental energy resolution of ∆ω ∼ 0.25 meV from Wakimoto et al., the xdependence of T dv is qualitatively the same as that of T el (∆ω = 0.25 meV), the temperature below which the elastic magnetic scattering develops around (π, π). Thus, a revised magnetic phase diagram in the lightly doped region of La2−xSrxCuO4 is proposed. The Curie constants calculated from the in-plane susceptibility are independent of the Sr concentration. On the basis of the cluster spin-glass model, this fact might reflect an inhomogeneous distribution of doped holes in the CuO2 plane, such as in a stripe structure. 74.72.Dn, 74.25.Ha, 75.50.Lk

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“…In Sr or Li doped La 2 CuO 4 , a spin glass transition occurs in a wide doping range at a similar temperature, T sf ∼ 10 K [23,24,25]. In La 2 Cu 0.94 Li 0.06 O 4 , T sf = 8 K [25].…”

mentioning

confidence: 99%

Novel Dynamic Scaling Regime in Hole-DopedLa2CuO4

Bao¹,

Chen²,

Qiu³

et al. 2003

Phys. Rev. Lett.

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Only 3% hole doping by Li is sufficient to suppress the long-range 3-dimensional (3D) antiferromagnetic order in La2CuO4. The spin dynamics of such a 2D spin liquid state at T ≪ J was investigated with measurements of the dynamic magnetic structure factor S(ω, q), using cold neutron spectroscopy, for single crystalline La2Cu0.94Li0.06O4. S(ω, q) peaks sharply at (π, π) and crosses over around 50 K from ω/T scaling to a novel low temperature regime characterized by a constant energy scale. The possible connection to a crossover from the quantum critical to the quantum disordered regime of the 2D antiferromagnetic spin liquid is discussed.The experimental investigation of the spin dynamics of doped Heisenberg antiferromagnets on a square lattice is essential to understanding cuprate superconductors, as well as to current research on quantum phase transitions [1]. For the structurally simplest laminar cuprate, La 2 CuO 4 , the 3-dimensional (3D) antiferromagnetic Néel order due to weak interlayer magnetic interaction can be suppressed by 2-3% hole doping using Sr, Ba or Li, thus allowing experimental investigation of the quantum spin dynamics of a 2-dimensional (2D) spin liquid in a wide temperature range, 0At the critical doping concentration, y c , of La 2 CuO 4 and at T = 0, namely at the quantum critical point, spin dynamics is described by classical critical dynamics in 2+1 dimensions [2]. At a finite temperature, the extra dimension in imaginary time is reduced to a finite thickness ofhc/k B T , where c is the spin wave velocity. As a consequence of this long wavelength cutoff, spin dynamics follows the quantum criticalhω/k B T scaling [3]. This has been experimentally observed in Ba and Sr doped La 2 CuO 4 in previous inelastic neutron scattering studies [4,5,6]. At T = 0 and above the critical doping concentration y > y c , zero-point quantum fluctuations set another long wavelength cutoff. Therefore, for y > y c , when the thermal cutoff length,hc/k B T , reaches the quantum cutoff during cooling, a crossover in spin dynamics from the quantum critical (QC) regime, where the energy scale is k B T , to the quantum disordered (QD) regime, where the energy scale is fixed at infrared by the quantum cutoff, occurs [2,3]. This crossover, however, has not been explicitly investigated experimentally. Here, we report a cold neutron inelastic scattering study on spin dynamics in Li doped La 2 CuO 4 from 150 K to 1.5 K. A crossover from the ω/T scaling to a new low temperature regime, which features an infrared energy cutoff, is directly observed.The critical doping concentration, y c , for Li doped La 2 CuO 4 is 3% [7,8]. In this study, a y=6% single crystal, La 2 Cu 0.94 Li 0.06 O 4 , weighing 2.1 g, was grown in CuO flux, using isotopically enriched 7 Li (98.4%) to reduce neutron absorption of natural Li. The crystal has orthorhombic Cmca symmetry with lattice parameters a = 5.351Å, b = 13.15Å and c = 5.386Å at 295 K. Using this orthorhombic unit cell to label reciprocal q space, the (π, π) point in the square latt...

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Magnetic phase diagram of lightly dopedLa2−xSr

Cited by 166 publications

References 20 publications

Electronic phase separation in lightly dopedLa2−xSrxCu
Matsuda
¹
,
Fujita
²
,
Yamada
³

et al. 2002
Phys. Rev. B
173
19
159
2
View full text Add to dashboard Cite

Electronic phase separation in lightly dopedLa2−xSrxCu
Matsuda
¹
,
Fujita
²
,
Yamada
³

et al. 2002
Phys. Rev. B
173
19
159
2
View full text Add to dashboard Cite

Systematic study of short-range antiferromagnetic order and the spin-glass state in lightly dopedLa2−xSrx

Novel Dynamic Scaling Regime in Hole-DopedLa2CuO4

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Magnetic phase diagram of lightly dopedLa2−xSr

Cited by 166 publications

References 20 publications

Electronic phase separation in lightly dopedLa2−xSrxCuMatsuda1, Fujita2, Yamada3 et al. 2002Phys. Rev. B173191592View full textAdd to dashboardCite

Electronic phase separation in lightly dopedLa2−xSrxCuMatsuda1, Fujita2, Yamada3 et al. 2002Phys. Rev. B173191592View full textAdd to dashboardCite

Systematic study of short-range antiferromagnetic order and the spin-glass state in lightly dopedLa2−xSrx

Novel Dynamic Scaling Regime in Hole-DopedLa2CuO4

Contact Info

Product

Resources

About

Electronic phase separation in lightly dopedLa2−xSrxCu
Matsuda
¹
,
Fujita
²
,
Yamada
³

et al. 2002
Phys. Rev. B
173
19
159
2
View full text Add to dashboard Cite

Electronic phase separation in lightly dopedLa2−xSrxCu
Matsuda
¹
,
Fujita
²
,
Yamada
³

et al. 2002
Phys. Rev. B
173
19
159
2
View full text Add to dashboard Cite