Spin freezing in the pyrochlore antiferromagnet Pr2Zr2O7

Matsuhira, Kazuyuki; Sekine, Chihiro; Paulsen, C.; Wakeshima, Makoto; Hinatsu, Yukio; Kitazawa, Takahiro; Kiuchi, Yoshihiro; Hiroi, Zenji; Takagi, Seishi

doi:10.1088/1742-6596/145/1/012031

Cited by 45 publications

(86 citation statements)

References 11 publications

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“…Figure 1(a) shows the temperature (T ) dependence of the inverse magnetic susceptibility 1/χ(T ) for the magnetic field (H) along the [111] direction below 10 K. The data follows Curie-Weiss law χ(T ) = C/(T − θ CW ), and the fit yields the effective moment µ eff = 2.5µ B and Weiss-temperature θ CW = −0.4 K (antiferromagnetic). The negative, antiferromagnetic Weiss temperature is consistent with the previous reports [14,15]. Dy, Ho) becomes the so-called "three-in, one-out" structure when the magnetic field is applied along the 111 direction [16].…”

Section: Resultssupporting

confidence: 91%

Magnetic and Thermal Properties of the Single Crystalline Pr₂Zr₂O₇ in a [111] Field

Kimura¹,

Nakatsuji²

2014

Proceedings of the International Conference on Strongly Correlated Electron Systems (SCES2013)

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We report the experimental results of magnetic and thermal properties of the single crystalline pyrochlore magnet Pr 2 Zr 2 O 7 , a new class of spin ice system based on exchange interactions. Under zero magnetic field, specific heat shows a broad peak around 1.5 K, associated with the spin ice formation. Under the field of 9 T along the [111] direction, on the other hand, the specific heat forms two broad peaks at temperatures of 3 K and 10 K. These peaks are attributable to the different size of Zeeman splittings of spins on a kagomé and triangular planes with the assumption of the large Ising anisotropy along the [111] direction. Quantum fluctuations in this system are also discussed based on the specific heat data.

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Section: Resultssupporting

confidence: 91%

Magnetic and Thermal Properties of the Single Crystalline Pr₂Zr₂O₇ in a [111] Field

Kimura¹,

Nakatsuji²

2014

Proceedings of the International Conference on Strongly Correlated Electron Systems (SCES2013)

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“…(determined from polycrystalline syntheses where the compositions are known) than previous reported growths under oxygen atmospheres [22][23]. The optimized grown crystals have been stable for months in ambient conditions, with no surface degradation.…”

Section: Characterizationmentioning

confidence: 87%

Synthesis, floating zone crystal growth and characterization of the quantum spin ice Pr2Zr2O7 pyrochlore

Koohpayeh

Wen

Trump

et al. 2014

Journal of Crystal Growth

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Pyrochlore Pr 3+ 2+x Zr 4+ 2-x O 7-x/2 samples in the form of both powders (-0.02≤x≤0.02) and bulk single crystals have been studied to elucidate the dependence of their magnetic, compositional and structural properties on synthesis and growth conditions. All samples were characterized using X-ray diffraction, specific heat, and DC magnetization measurements. The crystals were also studied using the X-ray Laue technique and scanning electron microscopy. Increasing the Pr content for the Pr 2+x Zr 2-x O 7-x/2 powders enlarged the lattice parameter, and resulted in systematic changes in magnetic susceptibility and specific heat.Stoichiometric and high quality single crystals of Pr 2 Zr 2 O 7 were grown using the optical floating zone technique under a high purity static argon atmosphere, to avoid inclusions of Pr 4+ and limit Pr vaporization. Increasing the growth speed was found to significantly reduce Pr vaporization for better control of stoichiometry. Scanning electron microscopy provided direct evidence of spinodal decomposition during growth that is controllable via rotation rate. An intermediate rotation rate of 3-6 rpm was found to produce the best microstructure. The magnetic susceptibility of crystals grown at rates from

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“…Single crystalline samples of Pr 2 Zr 2 O 7 were grown by a floating zone method 35 . The orientation of each crystals was established by X-ray Laue diffraction.…”

Section: Methodsmentioning

confidence: 99%

Quantum fluctuations in spin-ice-like Pr2Zr2O7

et al. 2013

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Spin ice is a magnetic analog of H 2 O ice that harbors dense static disorder. Dipolar interactions between classical spins yield a frozen frustrated state with residual configurational Pauling entropy and emergent magnetic monopolar quasiparticles. Introducing quantum fluctuations is of great interest as this could melt spin ice and allow coherent propagation of monopoles. Here, we report experimental evidence for quantum dynamics of magnetic monopolar quasiparticles in a new class of spin ice based on exchange interactions, Pr 2 Zr 2 O 7 . Narrow pinch point features in otherwise diffuse elastic neutron scattering reflects adherence to a divergence-free constraint for disordered spins on long time scales. Magnetic susceptibility and specific heat data correspondingly show exponentially activated behaviors. In sharp contrast to conventional ice, however, 490% of the neutron scattering is inelastic and devoid of pinch points furnishing evidence for magnetic monopolar quantum fluctuations.

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Spin freezing in the pyrochlore antiferromagnet Pr₂Zr₂O₇

Cited by 45 publications

References 11 publications

Magnetic and Thermal Properties of the Single Crystalline Pr₂Zr₂O₇ in a [111] Field

Magnetic and Thermal Properties of the Single Crystalline Pr₂Zr₂O₇ in a [111] Field

Synthesis, floating zone crystal growth and characterization of the quantum spin ice Pr2Zr2O7 pyrochlore

Quantum fluctuations in spin-ice-like Pr2Zr2O7

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Spin freezing in the pyrochlore antiferromagnet Pr2Zr2O7

Cited by 45 publications

References 11 publications

Magnetic and Thermal Properties of the Single Crystalline Pr2Zr2O7 in a [111] Field

Magnetic and Thermal Properties of the Single Crystalline Pr2Zr2O7 in a [111] Field

Synthesis, floating zone crystal growth and characterization of the quantum spin ice Pr2Zr2O7 pyrochlore

Quantum fluctuations in spin-ice-like Pr2Zr2O7

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Product

Resources

About

Spin freezing in the pyrochlore antiferromagnet Pr₂Zr₂O₇

Magnetic and Thermal Properties of the Single Crystalline Pr₂Zr₂O₇ in a [111] Field

Magnetic and Thermal Properties of the Single Crystalline Pr₂Zr₂O₇ in a [111] Field