Non-Fermi liquid form of the low temperature resistivity in the low moment ferromagnets Ni3Al and YNi3

Steiner, Markus J.; Beckers, Fabien; Niklowitz, P. G.; Lonzarich, G. G.

doi:10.1016/s0921-4526(02)02341-4

Cited by 18 publications

(10 citation statements)

References 10 publications

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“…Weak itinerant ferromagnets (wFM) and antiferromagnets (wAFM) are not very common and have raised a large and ongoing interest as they are near the onset of magnetism, present large spin-fluctuations and are often close to quantum critical point and even superconductivity [1][2][3]. Among the wFM, several studies have been performed on ZrZn 2 [4,5], Ni 3 Al [6][7][8][9][10], Fe 2 N [11,12] and AsNCr 3 [13]. wAFM are even less common than wFM and have been observed in some compounds like TiBe 2 [14][15][16], TiAu [17][18][19][20] and UN [21].…”

Section: Introductionmentioning

confidence: 99%

Relation between the weak itinerant magnetism inA₂Ni₇compounds (A = Y, La) and their stacked crystal structures

Crivello

Paul‐Boncour

2020

J. Phys.: Condens. Matter

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The weak itinerant magnetic properties of A2Ni7 compounds with A = {Y, La} have been investigated using electronic band structure calculations in the relation with their polymorphic crystal structures. These compounds crystallizes in two structures resulting from the stacking of two and three blocks of [A2Ni4 + 2 ANi5] units for hexagonal 2H-La2Ni7 (Ce2Ni7 type) and rhombohedral 3R-Y2Ni7 (Gd2Co7 type) respectively. Experimentally, 2H-La2Ni7 is a weak itinerant antiferromagnet whereas 3R-Y2Ni7 is a weak itinerant ferromagnet. From the present first principles calculation within non-spin polarized state, both compounds present an electronic density of state with a sharp and narrow peak centered at the Fermi level corresponding to flat bands from 3d-Ni. This induces a magnetic instability and both compounds are more stable in a ferromagnetic (FM) order compared to a paramagnetic state (ΔE ≈ -35 meV/f.u.). The magnetic moment of each of the five Ni sites varies with their positions relative to the [A2Ni4] and [ANi5] units: they are minimum in the [A2Ni4] unit and maximum at the interface between two [ANi5] units. For 2H-La2Ni7, an antiferromagnetic (AFM) structure has been proposed and found with an energy comparable to that of the FM state. This AFM structure is described by two FM unit blocks of opposite Ni spin sign separated by a non-magnetic layer at z = 0 and ½. The Ni (2a) atoms belonging to this intermediate layer are located in the [La2Ni4] unit and are at a center of symmetry of the hexagonal cell (P63/mmc) where the resultant molecular field is cancelled. Further non-collinear spin calculations have been performed to determine the Ni moment orientations which are found preferentially parallel to the c axis for both FM and AFM structures.

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Section: Introductionmentioning

confidence: 99%

Relation between the weak itinerant magnetism inA₂Ni₇compounds (A = Y, La) and their stacked crystal structures

Crivello

Paul‐Boncour

2020

J. Phys.: Condens. Matter

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“…While disorder can affect the order of the quantum critical phase transition in itinerant ferromagnets [21], it is generally found in systems with continuous transitions tuned by a parameter ÿ that the QCP, which occurs for ÿ ÿ c and T 0, dominates the magnetic phase diagram and generates a phase line T dn=z C ÿ ÿ ÿ c , where d 3, z n 2 3 [13,19,22,23]. Near the QCP, the electronic part of the heat capacity is maximized [24 -28] while the electrical resistivity evolves from / T 1 for ÿ ÿ C to the Fermi liquid / T 2 for ÿ > ÿ C [19,[29][30][31]. The low field magnetization is anomalous near the QCP [13,19], but a detailed study spanning the ordered and paramagnetic phases is still lacking.…”

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Critical Phenomena and the Quantum Critical Point of FerromagneticZr1−xNbxZn2

et al. 2006

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“…Further, it was recently reported that Ni 3 Al shows non-Fermi liquid transport over a large range of P and T range down to very low T . [9] DFT is an exact ground state theory, and as such should properly describe the magnetic ground states of metals. However, common approximations to DFT, such as the LDA and GGA, are based on the properties of the uniform electron gas at densities that occur in solids.…”

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confidence: 99%

WhyNi3AlIs an Itinerant Ferromagnet butNi
Aguayo
¹
,
Mazin
²
,
Singh
³

2004
Phys. Rev. Lett.
93
9
82
1
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Ni3Al and Ni3Ga are closely related materials on opposite sides of a ferromagnetic quantum critical point. The Stoner factor of Ni is virtually the same in both compounds and the density of states is larger in Ni3Ga. Thus in Stoner theory it should be more magnetic, and in local-density approximation (LDA) calculations it is. However, experimentally it is a paramagnet, while Ni3Al is an itinerant ferromagnet. We show that critical spin fluctuations are stronger in Ni3Ga, due to weaker q dependence of the susceptibility, and this effect is enough to reverse the trend. The approach combines LDA calculations with Landau theory and the fluctuation-dissipation theorem using the same momentum cutoff for both compounds. The calculations provide evidence for strong, beyond LDA, spin fluctuations associated with the critical point in both materials, but stronger in Ni3Ga than in Ni3Al.

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Non-Fermi liquid form of the low temperature resistivity in the low moment ferromagnets Ni3Al and YNi3

Cited by 18 publications

References 10 publications

Relation between the weak itinerant magnetism inA₂Ni₇compounds (A = Y, La) and their stacked crystal structures

Relation between the weak itinerant magnetism inA₂Ni₇compounds (A = Y, La) and their stacked crystal structures

Critical Phenomena and the Quantum Critical Point of FerromagneticZr1−xNbxZn2

WhyNi3AlIs an Itinerant Ferromagnet butNi
Aguayo
¹
,
Mazin
²
,
Singh
³

2004
Phys. Rev. Lett.
93
9
82
1
View full text Add to dashboard Cite

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Non-Fermi liquid form of the low temperature resistivity in the low moment ferromagnets Ni3Al and YNi3

Cited by 18 publications

References 10 publications

Relation between the weak itinerant magnetism inA2Ni7compounds (A = Y, La) and their stacked crystal structures

Relation between the weak itinerant magnetism inA2Ni7compounds (A = Y, La) and their stacked crystal structures

Critical Phenomena and the Quantum Critical Point of FerromagneticZr1−xNbxZn2

WhyNi3AlIs an Itinerant Ferromagnet butNiAguayo1, Mazin2, Singh3 2004Phys. Rev. Lett.939821View full textAdd to dashboardCite

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Relation between the weak itinerant magnetism inA₂Ni₇compounds (A = Y, La) and their stacked crystal structures

Relation between the weak itinerant magnetism inA₂Ni₇compounds (A = Y, La) and their stacked crystal structures

WhyNi3AlIs an Itinerant Ferromagnet butNi
Aguayo
¹
,
Mazin
²
,
Singh
³

2004
Phys. Rev. Lett.
93
9
82
1
View full text Add to dashboard Cite