Disorder-induced critical exponents near a ferromagnetic quantum critical point in 
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Mishra, A. K.; Samatham, S. Shanmukharao; Lees, Martin R.; Ganesan, V.

doi:10.1103/physrevb.101.144436

Cited by 12 publications

(10 citation statements)

References 44 publications

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“…4(a)]. On the other hand, our recent results in Mn 1−x Cr x Si [9] with FM QCP and non-mean-field exponents belong to the case of intermediate disorder [Fig. 4(b)].…”

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confidence: 81%

“…However, ferromagnetic (FM) QCP in clean metals is interrupted by a first-order (FO) transition at a tricritical point (TCP) [3][4][5][6][7]. On the contrary, studies demonstrated that an intermediate disorder suppresses the TCP and restores the QCP [7][8][9][10]. Nevertheless, strong disorder can also lead to the formation of locally ordered rare regions irrespective of the disordered bulk system [11][12][13].…”

mentioning

confidence: 99%

“…MnSi, known for its skyrmion lattice in the H-T phase diagram [15,16], is a standard system for studying QCP due to its low ordering temperature, T C ∼ 30 K [3,15,17]. Nonetheless, both pressure and doping studies established the presence of QPTs in p−x and T −x phase diagrams [3,4,9,10,[18][19][20][21][22][23][24][25][26][27][28][29]. The pressure-induced QCP in MnSi at the critical pressure p C ∼ 14.6 kbar, however, is still debated [30], as some results support the FO QPT [3,4], while others support the QCP or weak FO transition [29].…”

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confidence: 99%

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Quantum Griffiths phase in disordered Mn1−xFexSi

et al. 2023

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We show the presence of magnetic rare regions consistent with the quantum Griffiths phase in Fe-doped MnSi using detailed heat capacity, magnetization, and muon spin relaxation (μSR) measurements down to millikelvin temperatures. The slow dynamics of these rare regions at low temperatures leads to the non-Fermi-liquid behavior in heat capacity and magnetization. The μSR and magnetization results further indicate that the dynamics freezes into a cluster-glass state below T f ∼ 1.25 K. The results are in agreement with theoretical models proposed in the literature for metallic systems with Heisenberg symmetry that exhibit the quantum Griffiths phase in the presence of strong disorder.

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“…4(a)]. On the other hand, our recent results in Mn 1−x Cr x Si [9] with FM QCP and non-mean-field exponents belong to the case of intermediate disorder [Fig. 4(b)].…”

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confidence: 81%

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confidence: 99%

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confidence: 99%

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Quantum Griffiths phase in disordered Mn1−xFexSi

et al. 2023

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“…The thermodynamic variables show unconventional behaviour [11] and some novel phases have been reported to emerge in the quantum critical region [9]. The transport properties of metals show deviations from the Fermi-liquid theory [12][13][14][15] and the formation of nematic fluid state [16,17] have been reported in the vicinity of quantum phase transitions. The quantum critical behaviour in different systems shows a universal behaviour depending on the dimensionality of the system and the order parameter [18,19].…”

Section: Introductionmentioning

confidence: 99%

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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“…Specifically, experimental signatures of the Griffiths phase are power laws with non-universal exponents 9 in thermodynamic responses, that are observed in many systems. 4,10 In general, disordered alloys close to a ferromagnetic QCP are recognized by unusual scaling behavior [11][12][13] with exponents that depend on the degree of disorder. 14 Note that QCPs in FM are rare, more often new phases emerge when T c gets suppressed.…”

Section: Introductionmentioning

confidence: 99%

Evolution of short-range magnetic correlations in the ferromagnetic alloys Ni-V

Bhattarai¹,

Adawi²,

Lussier³

et al. 2022

Preprint

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We experimentally study how the magnetic correlations develop in a binary alloy close to the ferromagnetic quantum critical point with small-angle neutron scattering (SANS). Upon alloying the itinerant ferromagnet nickel with vanadium, the ferromagnetic order is continuously suppressed. The critical temperature Tc vanishes when vanadium concentrations reach the critical value of xc = 0.116 indicating a quantum critical point separating the ferromagnetic and paramagnetic phases. Earlier magnetization and µSR data have indicated the presence of magnetic inhomogeneities in Ni1−xVx and, in particular, recognize the magnetic clusters close to xc, on the paramagnetic and on the ferromagnetic sides with nontrivial dynamical properties. We present the results of SANS study with full polarization analysis of polycrystalline Ni1−xVx samples with x = 0.10 and x = 0.11 with low critical temperatures Tc < 50 K. For both Ni-V samples close to xc we find isotropic magnetic short-range correlations in the nanometer-scale persisting at low temperatures. They are suppressed gradually in higher magnetic fields. In addition, signatures of long-range ordered magnetic domains are present below Tc. The fraction of these magnetic clusters embedded in the ferromagnetic ordered phase grows towards xc and agrees well with the cluster fraction estimate from the magnetization and µSR data. Our SANS studies provide new insights into the nature of the inhomogeneities in a ferromagnetic alloy close to a quantum critical point.

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Disorder-induced critical exponents near a ferromagnetic quantum critical point in Mn1−xCrxSi

Cited by 12 publications

References 44 publications

Quantum Griffiths phase in disordered Mn1−xFexSi

Quantum Griffiths phase in disordered Mn1−xFexSi

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

Evolution of short-range magnetic correlations in the ferromagnetic alloys Ni-V

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Disorder-induced critical exponents near a ferromagnetic quantum critical point in Mn1−xCrxSi

Cited by 12 publications

References 44 publications

Quantum Griffiths phase in disordered Mn1−xFexSi

Quantum Griffiths phase in disordered Mn1−xFexSi

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

Evolution of short-range magnetic correlations in the ferromagnetic alloys Ni-V

Contact Info

Product

Resources

About

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