Quantum critical behavior of the (Cr86Ru14)1−xVx alloy system

Reddy, Leelakrishna; Alberts, H. L.; Strydom, A. M.; Prinsloo, A. R. E.; Venter, А.M.

doi:10.1063/1.2832676

Cited by 13 publications

(4 citation statements)

References 8 publications

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“…The charge carrier density of the Cr 1−x Al x alloy system shows a sudden increase at the ISDW to CSDW phase transition. A similar behaviour related to QC was reported in pure Cr [6] and several binary [7,8] and ternary [9] Cr alloys. The behaviour of the these parameters, γ(x), n 2K (x) and N-G relationship suggests that there are critical effects occurring at the TP concentration.…”

Section: Introductionsupporting

confidence: 83%

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Effects of V concentration on the physical properties of Cr_1−xAl_x alloy system

2023

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Electrical resistivity (ρ), magnetic susceptibility (χ) and thermoelectric power (S) studies reported previously on the (Cr1-xAlx)99V1 alloy system indicate a suppression of antiferromagnetism in the concentration range 0.015 ≤ x ≤ 0.040. The present study incorporates Sommerfeld electronic specific heat coefficient (γ), thermal conductivity (κ), Hall coefficient (RH) and analyses of the previous results in order to have a comprehensive study of the alloy system. γ(x) depicts two peaks close to the same concentrations where 〖dS/dT|〗_(T→2K) (x) have minima, i.e. at xc1 ≈ 0.015 and xc2 ≈ 0.040. Such peaks and minima, respectively, have been considered as key signatures of quantum criticality (QC) in alloys of Cr. Evidence of band structure modification in the alloy system is shown by a change of slope in the Nordheim-Gorter (N-G) relationship showing a minimum at an extrapolated concentration x = 0.035. The slope is positive for the incommensurate (I) spin-density-wave (SDW) alloys with x < 0.035 and a negative for the commensurate (C) SDW alloys with x > 0.035. A behaviour reminiscent of changes in the band structure is also observed in the Lorenz number, L(x), for the alloy with x = 0. RH (T) results in the range 0 ≤ x ≤ 0.026 have a sharp increase in the density of charge carriers, [qR_(H(2K)) ]^(-1), at the ISDW to paramagnetic (P) phase transition. The concentrations x = 0.015 and x = 0.040 are therefore considered ISDW to P and P to CSDW quantum critical points, respectively.

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Section: Introductionsupporting

confidence: 83%

“…Such a decrease is driven by nesting when the AFM state is formed. The decrease in n 2K at the P to ISDW phase is associated with QC [6,7,9,36]. The jump in n 2K at x c1 = 0.015 in the present alloy system is a possible evidence of QC driven by a decrease in the e a / when V is added to Cr 1−x Al x .…”

Section: Discussionmentioning

confidence: 59%

Effects of V concentration on the physical properties of Cr_1−xAl_x alloy system

2023

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“…The numerical values for these fitting parameters are: a = 130 ± 60 K, b = 0.69 ± 0.19 and z c = 14.00 ± 0.20. The scaling component fits well to the mean-field value b = 0.5, that is expected for doping induced quantum phase transitions [2,3].…”

Section: Discussionmentioning

confidence: 65%

“…This is surprising as the MPDs of many Cr alloys with group-8 metals, such as Re and Ru, show interesting properties, including quantum critical behavior (QCB) [2,3], as well as superconducting (SC) behavior possibly co-existing with antiferromagnetic (AFM) order [1]. In order to address this limitation in the literature with regards to the phase diagram of Cr with group-8 metals a more recent study [4] focused on completing the magnetic phase diagram of Cr 100−z Os z .…”

Section: Introductionmentioning

confidence: 99%

Superconductivity and Quantum Critical Behavior in Cr_100-zOs_z

2017

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The magnetic phase diagrams of Cr alloys with group-8 metals, such as Re and Ru, show interesting properties. These include quantum critical and superconducting behavior. In order to extend these investigations this paper reports on the physical properties and the magnetic phase diagram of the Cr100−zOsz system, investigated in a concentration range of 2 ≤ z ≤ 30.6. Structural analysis indicate that samples with z < 22 have a bcc structure, while those with z > 22 include a cubic A15-type structure. Transport and magnetic property measurements indicate that the antiferromagnetic phase disappears at z ≈ 14 and that samples with concentrations z ≥ 12.2 show superconducting behavior. The magnetic phase diagram of Cr100−zOsz is constructed from the Néel and superconducting transition temperatures obtained from various measurements. The commensurate spin-densitywave to paramagnetic phase line decreases sharply for z > 4. Fitting parameters of a power law fit to the commensurate spin-density-wave to paramagnetic phase line indicate possible quantum critical behavior. Present results suggest that this phase line terminates in a superconducting dome near a magnetic quantum critical point, similar to that observed in certain heavy fermion systems, but not previously reported for other Cr alloys.

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Quantum criticality in the (Cr98.4Al1.6)100-Mo alloy system

Muchono

Sheppard

Prinsloo

2019

Journal of Alloys and Compounds

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Quantum critical behavior of the (Cr86Ru14)1−xVx alloy system

Cited by 13 publications

References 8 publications

Effects of V concentration on the physical properties of Cr_1−xAl_x alloy system

Effects of V concentration on the physical properties of Cr_1−xAl_x alloy system

Superconductivity and Quantum Critical Behavior in Cr_100-zOs_z

Quantum criticality in the (Cr98.4Al1.6)100-Mo alloy system

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Quantum critical behavior of the (Cr86Ru14)1−xVx alloy system

Cited by 13 publications

References 8 publications

Effects of V concentration on the physical properties of Cr1−x Al x alloy system

Effects of V concentration on the physical properties of Cr1−x Al x alloy system

Superconductivity and Quantum Critical Behavior in Cr100-zOsz

Quantum criticality in the (Cr98.4Al1.6)100-Mo alloy system

Contact Info

Product

Resources

About

Effects of V concentration on the physical properties of Cr_1−xAl_x alloy system

Effects of V concentration on the physical properties of Cr_1−xAl_x alloy system

Superconductivity and Quantum Critical Behavior in Cr_100-zOs_z