Quantum Griffiths phase in disordered 
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Mishra, A. K.; Samatham, S. Shanmukharao; Telling, M. T. F.; Hillier, A. D.; Lees, Martin R.; Суреш, К. Г.; Ganesan, V.

doi:10.1103/physrevb.107.l100405

Cited by 4 publications

(2 citation statements)

References 56 publications

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“…The presence of a cluster glass phase has been reported in the quantum critical region for T < 3 K [8,43], which masks the actual qcp in the system. In case of strongly disordered systems, local ordering effects like spin-glass freezing and quantum Griffiths effects can develop, that compete with the critical behaviour [23,46]. The region around the quantum phase transition in Ni 1−x V x has been reported to follow the predictions of the quantum Griffiths phase related with a quantum phase transition in a disordered metal [8].…”

Section: Introductionmentioning

confidence: 95%

Structural and physical properties of Ni 1−x V_x alloys around and away from quantum critical point

Brar,

Pathak,

Khalid

et al. 2024

J. Phys.: Condens. Matter

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We investigate the room temperature structure (global and local), temperature dependent magnetic and transport behaviour of Ni1–xVx (0 ≤ x ≤ 0.13) alloys. Our Energy Dispersive Analysis of X-rays results show that the prepared compositions are stoichiometric. With increase in V doping, the compounds exhibit a quantum phase transition around xc = 0.12, where the ferromagnetic phase is suppressed. Our results show that all the compounds stabilize in face centred cubic structure at RT and the lattice parameter shows unusual behaviour close to xc. The magnetic and heat capacity studies show signature of Griffiths phase on either side of xc. From 25 K to the lowest collected temperature, we observe a linear T dependence of resistivity at x = 0.1 and around xc, which is separated by a Fermi-liquid region around x = 0.106. This suggests that the origin of the transport behaviour is different around the quantum critical point and away from it. Our Ni K-edge X-ray Absorption Spectroscopy results show that there is a significant reduction in the first coordination number around Ni central atom on doping. Further, with doping, there is distortion in the first coordination shell around Ni. This suggests, with V doping, the local structure around Ni is different from the global structure as obtained from the X-ray Diffraction results. Interestingly, with doping, we observe a direct connection between the extent of distortion at RT and the magnetic disorder obtained at 2 K. We believe our results will motivate the scientific community to further study the interplay between the structural disorder and quantum fluctuations with temperature at the local level.

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Section: Introductionmentioning

confidence: 95%

Structural and physical properties of Ni 1−x V_x alloys around and away from quantum critical point

Brar,

Pathak,

Khalid

et al. 2024

J. Phys.: Condens. Matter

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“…However, given the intriguing properties of MnSi, understanding its response to negative pressure becomes crucial. Previous investigations reported the properties resulting from the magnetic-3d-element doping (Fe, Cr, Co) at the Mn site [25,28,[30][31][32][33]. However, the effect of non-magnetic-3delement doping is not known in the literature.…”

Section: Introductionmentioning

confidence: 99%

Spin-disorder intervened avoidance of quantum criticality in B20 cubic Mn 1−xVx Si

Khandelwal,

Shanmukharao Samatham,

Babu

et al. 2024

J. Phys.: Condens. Matter

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The eﬀect of negative chemical pressure with the substitution of transition metal V in an itinerant helimagnetically ordered MnSi, Mn1-x V x Si with x = 0-0.1, is explored using dc and ac-susceptibilities. With increasing x, the manifestations are unaﬀected crystal structure with increasing unit cell volume, suppression of long-range magnetic order, weakening of itinerant character and reduced spin-cooperative phenomenon. The emergence of spin-glass behaviour for x ≥ 0.1 intervenes in the occurrence of quantum phase transition. The constructed concentration-temperature x-T phase diagram illustrates the substitution-driven changes in the magnetism of MnSi. Further, the study suggests that the presence of a precursor state can favour the formation of spin-textures in magnetically ordered compositions 0 < x ≤ 0.05 below the ordering temperature.

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Lattice dynamics and enhanced electron–phonon coupling of itinerant magnet Fe1-Co Si (x ≥ 0.3): A 57Fe Mössbauer spectroscopy study

Hu,

Zhang,

Xue

et al. 2024

Journal of Magnetism and Magnetic Materials

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Quantum Griffiths phase in disordered Mn1−xFexSi

Cited by 4 publications

References 56 publications

Structural and physical properties of Ni 1−x V_x alloys around and away from quantum critical point

Structural and physical properties of Ni 1−x V_x alloys around and away from quantum critical point

Spin-disorder intervened avoidance of quantum criticality in B20 cubic Mn 1−xVx Si

Lattice dynamics and enhanced electron–phonon coupling of itinerant magnet Fe1-Co Si (x ≥ 0.3): A 57Fe Mössbauer spectroscopy study

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Quantum Griffiths phase in disordered Mn1−xFexSi

Cited by 4 publications

References 56 publications

Structural and physical properties of Ni 1−x V x alloys around and away from quantum critical point

Structural and physical properties of Ni 1−x V x alloys around and away from quantum critical point

Spin-disorder intervened avoidance of quantum criticality in B20 cubic Mn 1−xVx Si

Lattice dynamics and enhanced electron–phonon coupling of itinerant magnet Fe1-Co Si (x ≥ 0.3): A 57Fe Mössbauer spectroscopy study

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Product

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About

Structural and physical properties of Ni 1−x V_x alloys around and away from quantum critical point

Structural and physical properties of Ni 1−x V_x alloys around and away from quantum critical point