Quantum criticality and novel phases: Summary and outlook

Schofield, A. J.

doi:10.1002/pssb.200983084

Cited by 8 publications

(3 citation statements)

References 87 publications

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“…For x < x cr (Nb excess) and for x > 0.008 (Fe excess), ferromagnetic (FM) (including possibly ferrimagnetic [FiM]) order is observed. 8 This system has been featured in recent overviews of quantum criticality in weak magnets 10,11 suggesting that in searching for the mechanism of quantum criticality more emphasis should be given to transition metal compounds 12 (versus f -electron systems).…”

Section: Pacs Numbersmentioning

confidence: 99%

Quantum criticality in NbFe2induced by zero carrier velocity

2011

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Section: Pacs Numbersmentioning

confidence: 99%

Quantum criticality in NbFe2induced by zero carrier velocity

2011

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“…O(2) physics is recovered in the particle-hole symmetric regions where the quantum critical fans overlap. The "finite density O(2)" model universally governs this entire phase diagram including all of the crossovers (dashed lines) and phase transitions (solid lines) shown in this panel.offer an important and even richer set of open questions regarding quantum critical behavior and "avoided quantum criticality"[2][3][4][5]39].…”

mentioning

confidence: 99%

Techniques to measure quantum criticality in cold atoms

Hazzard

Mueller

2011

Phys. Rev. A

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Attempts to understand zero temperature phase transitions have forced physicists to consider a regime where the standard paradigms of condensed matter physics break down [1-4]. These quantum critical systems lack a simple description in terms of weakly interacting quasiparticles, but over the past 20 years physicists have gained deep insights into their properties. Most dramatically, theory predicts that universal scaling relationships describe their finite temperature thermodynamics up to remarkably high temperatures. Unfortunately, these universal functions are hard to calculate: for example there are no reliable general techniques [4,5] to calculate the scaling functions for dynamics. Viewing a cold atom experiment as a quantum simulator [6], we show how to extract universal scaling functions from (non-universal) atomic density profiles or spectroscopic measurements. Such experiments can resolve important open questions about the Mott-Metal crossover [7,8] and the dynamics of the finite density O(2) rotor model [1,9], with direct impact on theories of, for example, high temperature superconducting cuprates [10,11], heavy fermion materials [12], and graphene [13].Comment: 12 double spaced pages (main text), 12 double spaced pages (supplementary information), 4 figures (10 panels

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“…Heavy-fermion (HF) systems have been investigated intensively during the past decades due to their various exotic properties, such as unconventional superconductivity, quantum criticality, and non-Fermi-liquid behavior [1][2][3]. Chemical substitution is frequently used to tune the properties of HF systems, e.g., to suppress a magnetic ordering temperature to zero to reach a quantum critical point (QCP).…”

Section: Introductionmentioning

confidence: 99%

Site dependence of the Kondo scale inCePd1−xRhxdue to Pd-Rh disorder

et al. 2015

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We present measurements of the thermopower S(T ) on CePd 1−x Rh x between 2 K and 300 K. For low Rh content, the system behaves as a ferromagnetic Kondo system with a Curie temperature T C of about 6 K, a Kondo scale smaller than T C , and an overall crystal electric field splitting of 210 K. As the Rh content increases T C is suppressed, while the average Kondo scale gets larger. Simultaneously, the presence of different Ce environments leads to a broad distribution of local Kondo scales ranging from very small values to above 50 K. As a consequence, large thermopower values are observed over an extended temperature range. Close to the critical concentration we find power-law dependencies of S/T vs T down to 2 K. For a Rh content of x = 0.95 we may show explicitly that the thermopower contains contributions from Ce sites with different local energy scales.

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Quantum criticality and novel phases: Summary and outlook

Cited by 8 publications

References 87 publications

Quantum criticality in NbFe2induced by zero carrier velocity

Quantum criticality in NbFe2induced by zero carrier velocity

Techniques to measure quantum criticality in cold atoms

Site dependence of the Kondo scale inCePd1−xRhxdue to Pd-Rh disorder

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