Magnetic field tuning of antiferromagnetic Yb<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mn>3</mml:mn></mml:msub></mml:math>Pt<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mn>4</mml:mn></mml:msub></mml:math>

Wu, Lijun; Janssen, Y.; Marques, C.; Bennett, Michael; Kim, M. S.; Park, K.; Chi, Songxue; Lynn, J. W.; Lorusso, Giulia; Biasiol, G.; Aronson, M. C.

doi:10.1103/physrevb.84.134409

Cited by 18 publications

(22 citation statements)

References 67 publications

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“…Isomorphic Rb 2 PbCu(NO 2 ) 6 displays similar behaviour 18 . In K 2 PbCu(NO 2 ) 6 , we find a saturation field of H s ~ 7 T at T = 1.7 K (Fig. 2b); thus, the collective behaviour in CuElp is tunable with modest magnetic fields.…”

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confidence: 94%

“…Within the Néel state of a system with isotropic interactions and weak single-ion anisotropy, the continuous spin rotation induced by an increasing H leads to a broad peak in C/T(H) with a maximum at roughly half the critical field, H c , as seen in Yb 3 Pt 4 (ref. 6 ). The second striking aspect of our data is a sharp peak in C/T(H) at a value, H m , consistent with the phase formed at T m in the T-dependent sweeps in Fig.…”

Section: Lettersmentioning

confidence: 99%

“…1a). Hence, in destroying Néel order, H decreases the transverse components of the staggered moment to a value that is vanishingly small near the transition to the field-polarized state, leaving little entropy to be lost near T = 0, and thus low spectral weight available for quantum entanglement 6 .…”

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confidence: 99%

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Quantum criticality among entangled spin chains

et al. 2017

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An important challenge in magnetism is the unambiguous identification of a quantum spin liquid 1,2 , of potential importance for quantum computing. In such a material, the magnetic spins should be fluctuating in the quantum regime, instead of frozen in a classical long-range-ordered state. While this requirement dictates systems 3,4 wherein classical order is suppressed by a frustrating lattice 5 , an ideal system would allow tuning of quantum fluctuations by an external parameter. Conventional three-dimensional antiferromagnets can be tuned through a quantum critical point-a region of highly fluctuating spins-by an applied magnetic field. Such systems suffer from a weak specific-heat peak at the quantum critical point, with little entropy available for quantum fluctuations 6 . Here we study a different type of antiferromagnet, comprised of weakly coupled antiferromagnetic spin-1/2 chains as realized in the molecular salt K 2 PbCu(NO 2 ) 6 . Across the temperature-magnetic field boundary between three-dimensional order and the paramagnetic phase, the specific heat exhibits a large peak whose magnitude approaches a value suggestive of the spinon Sommerfeld coefficient of isolated quantum spin chains. These results demonstrate an alternative approach for producing quantum matter via a magnetic-field-induced shift of entropy from one-dimensional short-range order to a three-dimensional quantum critical point.Previous work on field-tuning of quantum fluctuations has focused on the transverse-field Ising model where the magnetic field (H) couples to a sector of the Hamiltonian not directly modifying the order parameter. While this paradigm has been explored in the three-dimensional (3D) dipolar ferromagnet LiHoF 4 (refs 7,8 ), and the 1D system CoNb 2 O 6 (ref. ), the need for a unique Ising-axis normal restricts the number of potential quantum-spin-liquid host materials. For the much broader class of 3D antiferromagnets (AFs), H can indeed tune the Néel temperature (T N ) into the quantum regime. Within the ordered state, however, on increasing H from zero one first encounters a spin-flop transition (for finite spin anisotropy), followed by a gradual reorientation of those spins (Fig. 1a). Hence, in destroying Néel order, H decreases the transverse components of the staggered moment to a value that is vanishingly small near the transition to the field-polarized state, leaving little entropy to be lost near T = 0, and thus low spectral weight available for quantum entanglement 6 . Here we demonstrate a different approach to tuning through a quantum critical point (QCP). The quasi-1D spin-1/2 AF K 2 PbCu(NO 2 ) 6 orders classically at 0.68 K (ref. 10; Fig. 1b). At lower temperatures within the Néel state, applied H values less than the intra-chain mean field cause little change in the specific heat C(T, H). At the phase boundary, however, a large amount of entropy is released, leading to a peak in C/T (Fig. 1c), the value of which (~ 2 J mol -1 K -2 at the lowest temperatures studied) is suggestive of the spinon ...

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Section: Lettersmentioning

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Quantum criticality among entangled spin chains

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“…1c), and the result is compared in Fig. 2 to the phase line T N (B) that was previously determined from specific heat, neutron diffraction, and magnetization measurements 23 . We note that the specific heat measurements place B CEP near 1.9 T, although the other measurements find B CEP ≃ 1.8 − 1.85 T. The agreement is very good, especially considering that the experiments were performed on different crystals, and that small uncertainties in the orientation of the field are inevitable.…”

Section: Resultsmentioning

confidence: 99%

“…Quantum critical fluctuations are still possible, in principle, if this transition is weakly first order. We speculate that the absence of these quantum critical fluctuations in Yb 3 Pt 4 may result from an inherent mean-field like character that is evident in the phase line T N (B), from the B=0 order parameter found in neutron diffraction measurements 21 ,and in the appearance of the specific heat transition itself 23 . The highly localized character of the moments in Yb 3 Pt 4 prohibits the sorts of quantum critical fluctuations between states with different Fermi surface volumes that were reported in YbRh 2 Si 2 , suggesting that they may be a larger part of the quantum critical fluctuations of the more hybridized heavy fermions than was previously appreciated.…”

Section: Discussionmentioning

confidence: 99%

Localized moments and the stability of antiferromagnetic order in Yb3Pt4

Janssen

Bennett

et al. 2012

Phys. Rev. B

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We present here the results of electrical resistivity ρ, magnetization M, ac susceptibility χ ′ ac , and specific heat CM measurements that have been carried out on single crystals of Yb3Pt4 over a wide range of fields and temperatures. The 2.4 K Néel temperature that is found in zero field collapses under field to a first order transition TN = 0 at BCEP = 1.85 T. In the absence of antiferromagnetic order, the specific heat CM(T, B), the magnetization M (T, B), and even the resistivity ρ(T, B) all display B/T scaling, indicating that they are dominated by strong paramagnetic fluctuations, where the only characteristic energy scale results from the Zeeman splitting of an energetically isolated, Yb doublet ground state. This paramagnetic scattering disappears with the onset of antiferromagnetic order, revealing Fermi liquid behavior ∆ρ = AT 2 that persists up to the antiferromagnetic phase line TN(B), but not beyond. The first order character of TN = 0 and the ubiquity of the paramagnetic fluctuations imply that non-Fermi liquid behaviors are absent in Yb3Pt4. In contrast to heavy fermions like YbRh2Si2, Yb3Pt4 represents an extremely simple regime of f -electron behavior where the Yb moments and conduction electrons are almost decoupled, and where Kondo physics plays little role.

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Heavily Doped Semiconductor Metamaterials for Mid‐Infrared Multispectral Perfect Absorption and Thermal Emission

Barho

Гонзалез-Посада

Cerutti

et al. 2020

Advanced Optical Materials

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A metamaterial perfect absorber based on layered, doped and undoped semiconductors is experimentally and theoretically investigated. Design rules are given to control the multispectral, narrow, strong absorption features (>98% absorption) in the mid‐IR spectrum. The proposed sub‐wavelength grating structures support localized surface plasmons and photonic resonances associated to the quarter wavelength optical thickness of the undoped spacer layer. The resonances hybridize depending on the geometric setup of the metamaterial and the material properties of the heavily doped semiconductor. The angular response of the resonances is studied to determine the acceptance angle. While the absorption is best at near‐normal incidence, the spectral position of the absorption bands is weakly dependent on the angular incidence up to angles of 45°. Complementary to the polarization‐dependent grating design of the metamaterial, an alternative based on a crossed grating nanopattern is also investigated for polarization insensitivity. Furthermore, it is demonstrated that the metamaterial perfect absorber provides a tailored thermal emission spectrum. Based on the heavily doped InAsSb/GaSb metamaterial platform, integrable and miniaturized perfect absorbers and thermal sources can be built.

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Magnetic field tuning of antiferromagnetic Yb3Pt4

Cited by 18 publications

References 67 publications

Quantum criticality among entangled spin chains

Quantum criticality among entangled spin chains

Localized moments and the stability of antiferromagnetic order in Yb3Pt4

Heavily Doped Semiconductor Metamaterials for Mid‐Infrared Multispectral Perfect Absorption and Thermal Emission

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