Magnetic properties of Eu-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>−</mml:mi><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Sr</mml:mi></mml:mrow><mml:mrow><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">CuO</mml:mi></mml:mrow><mml

Kataev, V.; Rameev, B.; Validov, A. A.; Büchner, B.; Hücker, M.; Borowski, R.

doi:10.1103/physrevb.58.r11876

Cited by 31 publications

(29 citation statements)

References 18 publications

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“…In particular, the glassy nature of the ordering has been investigated. In the case of Eu-doped La 2−x Sr x CuO 4 , related information has been obtained by electron-spin resonance detected from a very low density of Gd impurities (Kataev et al, 1997(Kataev et al, , 1998. A recent Cu NQR and Y NMR study has shown that similar signatures are observed in Ca-doped YBa 2 Cu 3 O 6 , consistent with the µSR study of (Niedermayer et al, 1998), and suggestive of the presence of pinned stripes in that system at low temperatures.…”

Section: E Other Probessupporting

confidence: 65%

How to detect fluctuating stripes in the high-temperature superconductors

et al. 2003

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We discuss fluctuating order in a quantum disordered phase proximate to a quantum critical point, with particular emphasis on fluctuating stripe order. Optimal strategies for extracting information concerning such local order from experiments are derived with emphasis on neutron scattering and scanning tunneling microscopy. These ideas are tested by application to two model systemsthe exactly solvable one dimensional electron gas with an impurity, and a weakly-interacting 2D electron gas. We extensively review experiments on the cuprate high-temperature superconductors which can be analyzed using these strategies. We adduce evidence that stripe correlations are widespread in the cuprates. Finally, we compare and contrast the advantages of two limiting perspectives on the high-temperature superconductor: weak coupling, in which correlation effects are treated as a perturbation on an underlying metallic (although renormalized) Fermi liquid state, and strong coupling, in which the magnetism is associated with well defined localized spins, and stripes are viewed as a form of micro-phase separation. We present quantitative indicators that the latter view better accounts for the observed stripe phenomena in the cuprates.

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Section: E Other Probessupporting

confidence: 65%

How to detect fluctuating stripes in the high-temperature superconductors

et al. 2003

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“…For example, 63 Cu nuclear spin-lattice relaxation rate 63 1/T 1 [16,17] measured for another striped material with the LTT structure, La 1.88 Ba 0.12 CuO 4 [18], exhibits no critical divergence at the stripe transition. The origin of the elusiveness is in the glassy nature of the stripe transition [6,18,19]. In other words, the critical slowing down of spin-stripe fluctuations below T charge is more gradual than ordinary magnetic phase transitions involving only the spin degrees of freedom.…”

mentioning

confidence: 99%

C63uNQR Measurement of Stripe Order Parameter inLa2

Hunt¹,

Singer²,

Thurber³

et al. 1999

Phys. Rev. Lett.

244

255

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We demonstrate that one can measure the charge-stripe order parameter in the hole-doped CuO2 planes of La1.875Ba0.125CuO4, La1.48Nd0.4Sr0.12CuO4 and La1.68Eu0.2Sr0.12CuO4 utilizing the wipeout effects of 63 Cu NQR. Application of the same approach to La2−xSrxCuO4 reveals the presence of similar stripe order for the entire underdoped superconducting regime The mechanism of high T c superconductivity has been a major controversy throughout the past decade [1][2][3]. The complexity of the phase diagram for temperature T and hole concentration x makes it difficult to identify the key leading toward the superconducting mechanism. In 1995, Tranquada et al. [4-6] demonstrated that La 1.6−x Nd 0.4 Sr x CuO 4 (x ∼ 1 8 ) exhibits chargestripe order at T charge = 65 K, followed by a spinstripe order at somewhat lower temperature, T spin = 50 K. The discovery of the stripe phase [7] has added a new feature to the already complex phase diagram. Initially, some researchers speculated that the stripe order was merely a byproduct of the LTO-LTT (low temperature orthorhombic-low temperature tetragonal) structural phase transition and was extrinsic to the fundamental physics of high T c superconductivity. However, more recently, spin-stripe order was observed in La 2−x Sr x CuO 4 (x = 0.12 [8,9] , exhibits no critical divergence at the stripe transition. The origin of the elusiveness is in the glassy nature of the stripe transition [6,18,19]. In other words, the critical slowing down of spin-stripe fluctuations below T charge is more gradual than ordinary magnetic phase transitions involving only the spin degrees of freedom. As a consequence, the apparent critical temperature T spin of the spin-stripe order is lower for experimental probes with slower frequency scales, i.e. T spin = 50 K for elastic neutron scattering (

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“…At 150 K a more precise analysis yields M DM ≃ 2. 45 that Eu-doping causes the high temperature structural transition HTT↔LTO to shift to higher temperature, which means that the octahedral tilt angle at low temperature becomes larger. 3 For a Eu content of y = 0.2 the HTT↔LTO transition shifts from 525 K in pure La 2 CuO 4 to about 700 K. 68 To be more quantitative we have compared data from literature for orthorhombic strain and octahedral tilt angles for pure and REdoped La 2 CuO 4 .…”

mentioning

confidence: 99%

Dzyaloshinsky-Moriya spin canting in the low-temperature tetragonal phase ofLa2−x−yEuySrx
Hücker
¹
,
Kataev
²
,
Pommer
³

et al. 2004
Phys. Rev. B
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The Cu spin magnetism in La2−x−yEuySrxCuO4 (x ≤ 0.17; y ≤ 0.2) has been studied by means of magnetization measurements in fields up to 14 Tesla. Our results clearly show that in the antiferromagnetic phase Dzyaloshinsky-Moriya (DM) superexchange causes Cu spin canting not only in the LTO phase but also in the structural low-temperature phases LTLO and LTT. In La1.8Eu0.2CuO4 the canted DM-moment is about 50% larger than in pure La2CuO4 which we attribute to the larger octahedral tilt angle in the Eu-doped compound. We also find clear evidence that the size of the canted DM-moment does not change significantly at the structural transition at TLT from LTO to LTLO and LTT. The most important change induced by the transition is a significant reduction of the magnetic coupling between the CuO2 planes. As a consequence, the spin-flip transition of the canted Cu spins which is observed in the LTO phase for magnetic field perpendicular to the CuO2 planes disappears in the LTT phase. The shape of the magnetization curves changes from the well known spin-flip type to a weak-ferromagnet type. However, no spontaneous weak ferromagnetism is observed even at very low temperatures, which seems to indicate that the interlayer decoupling in our samples is not perfect. Nonetheless, a small fraction ( 15%) of the DM-moments can be remanently magnetized throughout the entire antiferromagnetically ordered LTT/LTLO phase, i.e. for T < TLT and x < 0.02. It appears that the remanent DM-moment is perpendicular to the CuO2 planes. For magnetic field parallel to the CuO2 planes we find that the critical field of the spin-flop transition decreases in the LTLO phase, which might indicate a competition between different inplane anisotropies. To study the Cu spin magnetism in La2−x−yEuySrxCuO4, a careful analysis of the Van Vleck paramagnetism of the Eu 3+ ions was performed.

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Magnetic properties of Eu-dopedLa2−xSrxCuO

Cited by 31 publications

References 18 publications

How to detect fluctuating stripes in the high-temperature superconductors

How to detect fluctuating stripes in the high-temperature superconductors

C63uNQR Measurement of Stripe Order Parameter inLa2

Dzyaloshinsky-Moriya spin canting in the low-temperature tetragonal phase ofLa2−x−yEuySrx
Hücker
¹
,
Kataev
²
,
Pommer
³

et al. 2004
Phys. Rev. B
Self Cite

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Magnetic properties of Eu-dopedLa2−xSrxCuO

Cited by 31 publications

References 18 publications

How to detect fluctuating stripes in the high-temperature superconductors

How to detect fluctuating stripes in the high-temperature superconductors

C63uNQR Measurement of Stripe Order Parameter inLa2

Dzyaloshinsky-Moriya spin canting in the low-temperature tetragonal phase ofLa2−x−yEuySrxHücker1, Kataev2, Pommer3 et al. 2004Phys. Rev. BSelf Cite

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Product

Resources

About

Dzyaloshinsky-Moriya spin canting in the low-temperature tetragonal phase ofLa2−x−yEuySrx
Hücker
¹
,
Kataev
²
,
Pommer
³

et al. 2004
Phys. Rev. B
Self Cite