Magnetism of europium under extreme pressures

Bi, Wenli; Lim, Jinhyuk; Fabbris, G.; Zhao, Jiyong; Haskel, D.; E., E.; Hu, Michael Y.; Chow, Paul; Xiao, Yuming; Xu, Wei; Schilling, J. S.

doi:10.1103/physrevb.93.184424

Cited by 22 publications

(23 citation statements)

References 57 publications

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“…Discussion. Both experiment and our calculations concur that Eu retains its f 7 local moment without valence change, 6 and magnetic coupling vanishes at P c . Ev- idently the evolution of the electronic structure plays a critical role by inducing a AFM-MQPM transition.…”

supporting

confidence: 83%

Pressure-tuned Frustration of Magnetic Coupling in Elemental Europium

Savrasov

Pickett

2019

Phys. Rev. Lett.

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Applying linear response and the magnetic force theorem in correlated density functional theory, the inter-sublattice exchange constants of antiferromagnetic Eu are calculated and found to vanish near the pressure of Pc=82 GPa, just where magnetic order is observed experimentally to be lost. The Eu 4f 7 moment remains unchanged at high pressure, again in agreement with spectroscopic measurements, leaving the picture of perfect frustration of interatomic Ruderman-Kittel-Kasuya-Yoshida couplings in a broad metallic background, leaving a state of electrons strongly exchange coupled to arbitrarily oriented, possibly quasistatic local moments. This strongly frustrated state gives way to superconductivity at Tc=1.7K, observed experimentally. These phenomena, and free energy considerations related to correlations, suggest an unusual phase of matter that is discussed within the scenarios of the Doniach Kondo lattice phase diagram, the metallic spin glass class, and itinerant spin liquid or spin gas systems.

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supporting

confidence: 83%

Pressure-tuned Frustration of Magnetic Coupling in Elemental Europium

Savrasov

Pickett

2019

Phys. Rev. Lett.

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“…While ref. [8] reported that magnetic order disappeared just above 80 GPa, where superconductivity appears according to [1], it should be noted that the experiments in [8] were performed at temperatures higher than 11K, thus not ruling out magnetism at the temperatures considered in [1].…”

Section: C-s-h C-s-hmentioning

confidence: 98%

“…That something 'magnetic' may be going on in the Eu samples studied in [1] is certainly not farfetched given that Eu has a large local moment, is antiferromagnetic at ambient pressure below 90K, and is right next to elements in the periodic table that are ferromagnetic at ambient pressure, Gd below 293K and Tb below 219K. Furthermore a variety of magnetically ordered phases including ferromagneticlike behavior have been detected in Eu under pressure using synchrotron-based Mossbauer and x-ray emission spectroscopies [8]. While ref.…”

Section: C-s-h C-s-hmentioning

confidence: 99%

About the Pressure-Induced Superconducting State of Europium Metal at Low Temperatures

Hirsch¹

2020

Preprint

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In PRL 102, 197002 (2009), it was reported that Eu becomes superconducting in the pressure and temperature range [84-142GPa], [1.8-2.75K]. The claim was largely based on ac susceptibility measurements. Here I point out that recently reported ac susceptibility measurements on a hydride compound that appears to become superconducting near room temperature (Nature 586, 373 (2020)) call the results for Eu into question. It is suggested that the experiments on Eu should be repeated to validate or rule out the claim of superconductivity.

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“…These include electrical transport (Derr et al, 2008;Jaramillo et al, 2010), AC magnetic susceptibility (Debessai et al, 2009;Palmer et al, 2015) and heat capacity/calorimetry (Demuer et al, 2000) for studying the bulk properties of materials under pressure. Nuclear magnetic resonance (Eremets, 1996), Mö ssbauer spectroscopy (Bi et al, 2016), X-ray magnetic dichroism (Duman et al, 2005) and fluorescence (Bi et al, 2016), as well as optical probes (Eremets, 1996), allow characterization of local behavior. We focus in this article on high-pressure X-ray magnetic diffraction in a DAC environment, techniques that have emerged over the last two decades.…”

Section: Introductionmentioning

confidence: 99%

X-ray magnetic diffraction under high pressure

Wang

Rosenbaum

Feng

2019

Int Union Crystallogr J

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Advances in both non-resonant and resonant X-ray magnetic diffraction since the 1980s have provided researchers with a powerful tool for exploring the spin, orbital and ion degrees of freedom in magnetic solids, as well as parsing their interplay. Here, we discuss key issues for performing X-ray magnetic diffraction on single-crystal samples under high pressure (above 40 GPa) and at cryogenic temperatures (4 K). We present case studies of both non-resonant and resonant X-ray magnetic diffraction under pressure for a spin-flip transition in an incommensurate spin-density-wave material and a continuous quantum phase transition of a commensurate all-in–all-out antiferromagnet. Both cases use diamond-anvil-cell technologies at third-generation synchrotron radiation sources. In addition to the exploration of the athermal emergence and evolution of antiferromagnetism discussed here, these techniques can be applied to the study of the pressure evolution of weak charge order such as charge-density waves, antiferro-type orbital order, the charge anisotropic tensor susceptibility and charge superlattices associated with either primary spin order or softened phonons.

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Magnetism of europium under extreme pressures

Cited by 22 publications

References 57 publications

Pressure-tuned Frustration of Magnetic Coupling in Elemental Europium

Pressure-tuned Frustration of Magnetic Coupling in Elemental Europium

About the Pressure-Induced Superconducting State of Europium Metal at Low Temperatures

X-ray magnetic diffraction under high pressure

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