Spin-glass phase of cuprates

Hasselmann, N.; Neto, A. H. Castro; Smith, C. Morais

doi:10.1103/physrevb.69.014424

Cited by 56 publications

(82 citation statements)

References 63 publications

(119 reference statements)

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“…This phase was recently the subject of a theoretical study [39] that suggested the origin was based upon localized topological defects (termed "solitonic spin liquid") derived from a combined Mössbauer and theoretical analysis. The localized topological defects have parallels with proposed structures for the spin-glass phase in the lamellar cuprates [40].…”

Section: Introductionmentioning

confidence: 71%

Competing spin density wave, collinear, and helical magnetism inFe1+xTe

et al. 2017

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The Fe 1+x Te phase diagram consists of two distinct magnetic structures with collinear order present at low interstitial iron concentrations and a helical phase at large values of x with these phases separated by a Lifshitz point. We use unpolarized single-crystal diffraction to confirm the helical phase for large interstitial iron concentrations and polarized single-crystal diffraction to demonstrate the collinear order for the iron-deficient side of the Fe 1+x Te phase diagram. Polarized neutron inelastic scattering shows that the fluctuations associated with this collinear order are predominately transverse at low-energy transfers, consistent with a localized magnetic moment picture. We then apply neutron inelastic scattering and polarization analysis to investigate the dynamics and structure near the boundary between collinear and helical orders in the Fe 1+x Te phase diagram. We first show that the phase separating collinear and helical orders is characterized by a spin density wave with a single propagation wave vector of (∼0.45, 0, 0.5). We do not observe harmonics or the presence of a charge density wave. The magnetic fluctuations associated with this wave vector are different from the collinear phase, being strongly longitudinal in nature and correlated anisotropically in the (H,K) plane. The excitations preserve the C 4 symmetry of the lattice but display different widths in momentum along the two tetragonal directions at low-energy transfers. While the low-energy excitations and minimal magnetic phase diagram can be understood in terms of localized interactions, we suggest that the presence of the density wave phase implies the importance of electronic and orbital properties.

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Section: Introductionmentioning

confidence: 71%

Competing spin density wave, collinear, and helical magnetism inFe1+xTe

et al. 2017

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“…6), by taking into consideration a small additional frustrating effect of the local Zn impurity that slightly reduces the effective coupling. Also localized holes give rise to a frustration, 55 in this case of dipolar nature, that is often indicated as the cause of the dramatic reduction of T N (h). Our m F (h) data in Fig.…”

Section: B Nature Of the Two Magnetically Ordered Regimesmentioning

confidence: 99%

Magnetic states of lightly hole-doped cuprates in the clean limit as seen via zero-field muon spin spectroscopy

et al. 2010

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We have performed extensive zero field µSR experiments on pure YBa2Cu3O6+y and diluted Yrare-earth substituted Y0.92Eu0.08Ba2Cu3O6+y and Y0.925Nd0.075Ba2Cu3O6+y at light hole-doping. A common magnetic behavior is detected for all the three families, demonstrating negligible effects of the isovalent Y-substituent disorder. Two distinct regimes are identified, separated by a crossover, whose origin is attributed to the concurrent thermal activation of spin and charge degrees of freedom: a thermally activated and a re-entrant antiferromagnetic regime. The peculiar temperature and hole density dependence of the magnetic moment m(h, T ) fit a model with a (spin) activation energy for the crossover between the two regimes throughout the entire investigated range. The magnetic moment is suppressed by a simple dilution mechanism both in the re-entrant regime (0 ≤ h ≤ 0.056) and in the so-called Cluster Spin Glass state coexisting with superconductivity (0.056 < h 0.08). We argue a common magnetic ground state for these two doping regions and dub it frozen antiferromagnet. Conversely either frustration or finite-size effects prevail in the thermally activated antiferromagnetic state, that vanishes at the same concentration where superconductivity emerges, suggesting the presence of a quantum critical point at hc = 0.056(2).

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“…In addition to its pedagogical value, this section contains explicit results that should be useful for analyzing STM experiments on quasi 1D systems with dilute impurities, such as the chain-layers 4 Recent reviews of the mechanisms of stripe formation in the cuprates and, more generally in doped antiferromagnets, often with rather different perspectives on the issue, can be found in Refs. (Carlson et al, 2003;Emery et al, 1999;Hasselmann et al, 2002;Ichioka and Machida, 1999;Vojta and Sachdev, 1999;White et al, 2002;White and Scalapino, 2000;Zaanen, 1998;Zaanen and Littlewood, 1994). 5 Various perspectives concerning the relevance of local stripe order to other properties of the high-temperature superconductor are reviewed in (Carlson et al, 2003;Castro Neto, 2001;Lorenzana et al, 2001a,b;Zaanen et al, 2001).…”

Section: Introductionmentioning

confidence: 99%

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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Spin-glass phase of cuprates

Cited by 56 publications

References 63 publications

Competing spin density wave, collinear, and helical magnetism inFe1+xTe

Competing spin density wave, collinear, and helical magnetism inFe1+xTe

Magnetic states of lightly hole-doped cuprates in the clean limit as seen via zero-field muon spin spectroscopy

How to detect fluctuating stripes in the high-temperature superconductors

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