Fluctuation-Induced Heat Release from Temperature-Quenched Nuclear Spins near a Quantum Critical Point

Yh, Kim; Kaur, Narpinder; Bm, Atkins; Ns, Dalal; Takano, Y.

doi:10.1103/physrevlett.103.247201

Cited by 7 publications

(4 citation statements)

References 22 publications

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“…Given that both 99 Ru and 101 Ru isotopes have a large nuclear spin, nuclear magnetism is a plausible candidate, but a detailed modelling is lacking. Signatures of the particularly effective coupling of nuclear and electronic spins have also been seen 51…”

Section: Discussionmentioning

confidence: 91%

Limits to magnetic quantum criticality from nuclear spins

Eisenlohr,

Vojta

2020

Preprint

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The phenomenology of quantum phase transitions concerns physics at low temperatures and energies, and corresponding solid-state experiments often reach millikelvin temperatures. However, this is a scale where in many solids the influence of nuclear spins and their hyperfine interaction is no longer negligible. This may limit the observability of electronic quantum critical phenomena.Here we discuss how continuous magnetic quantum phase transitions get influenced, modified, or destroyed by the coupling to nuclear spins. We use simple yet paradigmatic spin models for magnetic quantum criticality and determine modifications to the phase diagram, the excitation spectrum, and thermodynamics due to the presence of nuclear spins. We estimate crossover scales below which purely electronic quantum criticality is no longer observable, and discuss the novel physics emerging at low temperatures. Our results are relevant for a variety of compounds displaying magnetic quantum phase transitions and, more generally, highlight the sensitivity of quantum critical systems to small perturbations.

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Section: Discussionmentioning

confidence: 91%

Limits to magnetic quantum criticality from nuclear spins

Eisenlohr,

Vojta

2020

Preprint

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“…Specific heat and magnetocaloric effect were measured on single crystals of Cr(dien) using a homemade calorimeter, as described elsewhere [22] at the National High Magnetic Field Laboratory (NHMFL) in Tallahassee, FL. The measurements were performed using a 3 He/ 4 He dilution refrigerator in an 18 T superconducting magnet with the magnetic field applied along b and c separately.…”

Section: Experimental Methodsmentioning

confidence: 99%

“…One such example is the rare oxidation state of Cr(IV) in Cr(diethylenetriamine)(O 2 ) 2 • H 2 O, (diethylenetriamine = C 4 H 13 N 3 ), hereafter Cr(dien) [18][19][20][21][22]. The core component of this compound has an elongated diskshaped geometry as depicted in fig.…”

Section: Introductionmentioning

confidence: 99%

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Magnetic-field-driven quantum criticality of the Ising-class square lattice Cr(dien) (O2)2·H2O and the orientation depend

et al. 2019

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The magnetic phase diagram of Cr(dien)(O 2 ) 2 • H 2 O (dien = C 4 H 13 N 3 ), a quasi-2D spin-1 antiferromagnet known to exhibit quantum phase behavior, is reported. Specific heat, torque magnetometry, and magnetocalorimetry were employed to obtain the phase diagram down to 200 mK. Near the T → 0 limit, the antiferromagnetic phase defers to a field-induced ferromagnetic phase at a critical field, HC . Analysis of the phase boundary through fitting with (H − HC ) = βT α yielded HC and the critical exponent α of the spin system. HC and α were found to be 15.2 ±0.02 T and 2.05 ± 0.09 respectively when H is parallel to the easy magnetic axis, and 12.4 ± 0.01 T and 1.91 ± 0.06 when perpendicular to it. These critical exponents are indicative of an Ising-type spin system, which was unanticipated result. Further, torque magnetometry detected a spin-flop transition of unknown origin over a wide orientation range of nearly 70°in the ab plane. Mean field theory yielded an estimate of the long sought-after single-ion anisotropy for this compound, D ≈ 0.25 K.

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Superconductivity in a Copper(II)‐Based Coordination Polymer with Perfect Kagome Structure

et al. 2017

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Ahighly crystalline copper(II) benzenehexathiolate coordination polymer (Cu-BHT) has been prepared. The twodimensional kagome structure has been confirmed by powder X-ray diffraction, high-resolution transmission electron microscopy, and high-resolution scanning transmission electron microscopy. The as-prepared sample exhibits bulk superconductivity at about 0.25 K, which is confirmed by the zero resistivity,A Cm agnetic susceptibility,a nd specific heat measurements.Another diamagnetic transition at about 3Ksuggests that there is as econd superconducting phase that may be associated with asingle layer or few layers of Cu-BHT.Itisthe first time that superconductivity has been observed in ac oordination polymer.Superconductivity is au nique quantum phenomenon characterized by zero electrical resistance and the Meissner effect.[1] It is one of the most challenging topics in physics and materials science because of its complex physical mechanism [1a,2] and potential applications such as in power transmission, magnetic resonance imaging,magnetic levitated trains,a nd superconducting quantum interference devices. [3] Superconductivity was originally observed in pure metals and later also in avariety of solid-state materials including metal/ metal alloys,i norganic compounds,a nd also,i mportantly, organic compounds.T he first organic superconductor (TMTSF) 2 PF 6 (TMTSF = tetramethyltetraselenafulvalene) were discovered in 1980s.[4] Since then, three main families of organic superconductor have been developed:o rganic charge-transfer salts similar to (TMTSF) 2 PF 6 , [4,5] carbonbased superconductors, [6] and organic aromatic compounds superconductors (OACs).[7] Historically,the low-dimensional characteristics of organic salts make organic superconductor one of the most important candidates for high-temperature superconductivity.[8] Although high-temperature superconductivity has not been observed in the above materials,t hey show many fascinating phenomena respected to chargedensity waves, [9] spin-density waves, [10] the three-dimensional quantum Hall effect, [5] and ap ossible spin-liquid state.[11]They become prototype systems to explore the physics of low-dimensional conductors.O nt he other hand, carbonbased superconductors and OACshave advantages to achieve ahigh superconducting transition temperature, T c . [7,12] Under ahigh pressure of 15 Kbar, T c for Cs 3 C 60 can be up to 38 K.[12a]Foralong time,i tw as the highest value for organic superconductor and even comparative to most of inorganic superconductors.R ecently,O ACsf urther broaden the research boundary of the organic superconductors;m ost of them show as uperconducting transition at ambient pressure.[7a] Motivated both by pursing high T c superconductors and understanding of fundamental science in superconductivity,c ontinuous efforts will be focused on identifying and developing new organic superconductors.Benefiting from the abundance of building blocks,organic two dimensional(2D) materials,s uch as 2D covalent organic frameworks and 2D...

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Fluctuation-Induced Heat Release from Temperature-Quenched Nuclear Spins near a Quantum Critical Point

Cited by 7 publications

References 22 publications

Limits to magnetic quantum criticality from nuclear spins

Limits to magnetic quantum criticality from nuclear spins

Magnetic-field-driven quantum criticality of the Ising-class square lattice Cr(dien) (O2)2·H2O and the orientation depend

Superconductivity in a Copper(II)‐Based Coordination Polymer with Perfect Kagome Structure

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