# Non-Fermi liquid regime in metallic pyrochlore iridates: Quantum Griffiths singularities

@article{Ghosh2020NonFermiLR, title={Non-Fermi liquid regime in metallic pyrochlore iridates: Quantum Griffiths singularities}, author={Bikas Ghosh and Vinod Kumar Dwivedi and Soumik Mukhopadhyay}, journal={Physical Review B}, year={2020}, volume={102}, pages={144444} }

We investigate the interplay of Kondo and Ruderman-Kittel-Kasuya-Yosida coupling in the presence of disorder by chemically substituting local moment ${\mathrm{Cr}}^{3+}$ at the Ir sublattice in the metallic ${\mathrm{Pr}}_{2}{\mathrm{Ir}}_{2}{\mathrm{O}}_{7}$. We find evidence of non-Fermi liquid behavior in the transport and thermodynamic measurements at low temperature. Specifically, the magnetic susceptibility exhibits power law divergence at $T=0$. The nonanalytic temperature and magnetic…

## References

SHOWING 1-10 OF 46 REFERENCES

Topological semimetal and Fermi-arc surface states in the electronic structure of pyrochlore iridates

- Physics
- 2011

We investigate novel phases that emerge from the interplay of electron correlations and strong spin-orbit interactions. We focus on describing the topological semimetal, a three-dimensional phase of…

Muon spin relaxation study of non-Fermi-liquid behavior near the ferromagnetic quantum critical point in CePd0.15Rh0.85

- Physics
- 2008

The low-energy spin dynamics near the ferromagnetic quantum critical point in ${\text{CePd}}_{0.15}{\text{Rh}}_{0.85}$ have been investigated using zero-field (ZF) and longitudinal-field muon spin…

Anomalous lattice contraction and emergent electronic phases in Bi-doped
Eu2Ir2O7

- PhysicsPhysical Review B
- 2019

We study the pyrochlore series (${\mathrm{Eu}}_{1\ensuremath{-}x}{\mathrm{Bi}}_{x}{)}_{2}{\mathrm{Ir}}_{2}{\mathrm{O}}_{7}$ for $0\ensuremath{\le}x\ensuremath{\le}1$. We show that for small $x$, the…

Dielectric anomalies and interactions in the three-dimensional quadratic band touching Luttinger semimetal Pr2Ir2O7

- Physics, MedicineNature Communications
- 2017

Dirac and Weyl semimetals with linearly crossing bands are the focus of much recent interest in condensed matter physics. Although they host fascinating phenomena, their physics can be understood in…

Evidence of density waves in single-crystalline nanowires of pyrochlore iridates

- Physics
- 2017

We present experimental evidence of emergent density wave instability in single crystalline low dimensional wires of Yittrium based Pyrochlore Iridates. We demonstrate electric field induced…

Metallic spin-liquid behavior of the geometrically frustrated Kondo lattice.

- Physics, MedicinePhysical review letters
- 2006

The results indicate that the underscreened moments show spin-liquid behavior below a renormalized correlation scale of 1.7 K, and the Kondo effect emerges and leads to a partial screening of the moments below /T*/.

Onset of antiferromagnetism in heavy-fermion metals

- Chemistry, PhysicsNature
- 2000

Evidence is found for an atomically local contribution to the magnetic correlations which develops at the critical gold concentration, corresponding to a magnetic ordering temperature of zero, which implies that a Fermi-liquid-destroying spin-localizing transition, unanticipated from the spin density wave description, coincides with the antiferromagnetic quantum critical point.

Evolution of structure and magnetism across the metal-insulator transition in the pyrochlore iridate
(Nd1−xCax)2Ir2O7

- PhysicsPhysical Review B
- 2019

We report on the evolution of the thermal metal-insulator transition in polycrystalline samples of Nd$_2$Ir$_2$O$_7$ upon hole-doping via substitution of Ca$^{2+}$ for Nd$^{3+}$. Ca substitution…

Quadratic Fermi node in a 3D strongly correlated semimetal

- Physics, MedicineNature communications
- 2015

This work identifies a non-trivial state with a single-point Fermi node protected by cubic and time-reversal symmetries, and implies that Pr2Ir2O7 is a parent state that can be manipulated to produce other strongly correlated topological phases, such as topological Mott insulator, Weyl semimetal, and quantum spin and anomalous Hall states.

Unconventional anomalous Hall effect enhanced by a noncoplanar spin texture in the frustrated Kondo lattice Pr2Ir2O7.

- Physics, MedicinePhysical review letters
- 2007

The possible spin-chirality effect in the Ir 5d conduction band due to the noncoplanar texture of Pr<111> Ising-like moments is discussed and the Hall effect is investigated in the geometrically frustrated Kondo lattice Pr2Ir2O7.