Quantum bicriticality in the heavy-fermion metamagnet YbAgGe

Abstract

Bicritical points, at which two distinct symmetry-broken phases become simultaneously unstable, are typical for spin-flop metamagnetism. Interestingly, the heavy-fermion compound YbAgGe also possesses such a bicritical point (BCP) with a low temperature T_BCP ~ 0.3 K at a magnetic field of mu_0 H_BCP ~ 4.5 T. In its vicinity, YbAgGe exhibits anomalous behavior that we attribute to the influence of a quantum bicritical point (QBCP), that is close in parameter space yet can be reached by tuning T_BCP further to zero. Using high-resolution measurements of the magnetocaloric effect, we demonstrate that the magnetic Grueneisen parameter Gamma_H indeed both changes sign and diverges as required for quantum criticality. Moreover, Gamma_H displays a characteristic scaling behavior but only on the low-field side, H < H_BCP, indicating a pronounced asymmetry with respect to the critical field. We speculate that the small value of T_BCP is related to the geometric frustration of the Kondo-lattice of YbAgGe.

submitted to PRL

References in corpus (11)

• Fermi-liquid instabilities at magnetic quantum phase transitions
• Fractionalized Fermi liquids
• Frustration and the Kondo effect in heavy fermion materials
• Divergence of the Magnetic Grüneisen Ratio at the Field-Induced Quantum Critical Point in YbRh${}_2$Si${}_2$
• Quantum phase transitions in heavy fermion metals and Kondo insulators
• Metamagnetic quantum criticality in Sr3Ru2O7 studied by thermal expansion
• β-YbAlB4: a critical nodal metal
• Anomalous reduction of the Lorenz ratio at the quantum critical point in YbAgGe
• Field-induced non-Fermi-liquid resistivity of stoichiometric YbAgGe single crystals
• Quantum criticality in itinerant metamagnets
• Quantum criticality with multiple dynamics

Cited by in corpus (48)

• Review on magnetic and related properties of RTX compounds
• Frustration and quantum criticality
• Characteristic signatures of quantum criticality driven by geometrical frustration
• Entropy evolution in the magnetic phases of partially frustrated CePdAl
• Grüneisen parameter studies on heavy fermion quantum criticality
• Preserved entropy and fragile magnetism
• Possible devil's staircase in the Kondo lattice CeSbSe
• Low Temperature metamagnetism and Hall effect anomaly in Kondo compound CeAgBi2
• Multiple metamagnetic quantum criticality in Sr${}_3$Ru${}_2$O${}_7$
• The two-dimensional metallic triangular lattice antiferromagnet CeCd3P3
• Temperature-field phase diagram of geometrically frustrated CePdAl
• Signature of frustrated moments in quantum critical CePd${}_{1-x}$Ni${}_x$Al
• Uniaxial stress tuning of geometrical frustration in a Kondo lattice
• Spin-liquid signatures in the quantum critical regime of pressurized CePdAl
• Electronic structure and physical properties of candidate topological material GdAgGe
• Anomalous metamagnetism in the low carrier density Kondo lattice YbRh3Si7
• Kondo destruction in a quantum paramagnet with magnetic frustration
• Quantum Annealed Criticality
• Semimetallic Kondo lattice behavior in YbPdAs with a distorted kagome structure
• Magnetization plateau and anisotropic magnetoresistance in the frustrated Kondo-lattice compound Ce3ScBi5
• Quantum Annealed Criticality: A Scaling Description
• GdPtPb: A non collinear antiferromagnet with distorted Kagomé lattice
• Long-range magnetic order in the anisotropic triangular lattice system CeCd3As3
• Classification of materials with divergent magnetic Grüneisen parameter
• Quantum critical spin-liquid-like behavior in S = 1/2 quasikagome lattice CeRh1-xPdxSn investigated using muon spin relaxation and neutron scattering
• Field-angle-resolved landscape of non-Fermi-liquid behavior in the quasi-kagome Kondo Lattice CeRhSn
• Kondo screening and coherence in kagome local-moment metals: Energy scales of heavy fermions in the presence of flat bands
• Hidden fluctuations close to a quantum bicritical point
• Deconfined quantum critical point lost in pressurized SrCu2(BO3)2
• Reinforcement of superconductivity by quantum critical fluctuations of metamagnetism in UTe${}_2$
• Intermediate valence in single crystalline Yb${}_2$Si${}_2$Al
• Pressure induced multicriticality and electronic instability in quasi-kagome ferromagnet URhSn
• Quantum bicritical point and phase separation in a frustrated Heisenberg ladder
• Deficiency of the scaling collapse as an indicator of a superconductor-insulator quantum phase transition
• Spin ice in a general applied magnetic field: Kasteleyn transition, magnetic torque and rotational magnetocaloric effect
• Phase diagram of Kondo-Heisenberg model on honeycomb lattice with geometrical frustration
• Field-induced quantum critical point in the new itinerant antiferromagnet Ti${}_3$Cu${}_4$
• Self-reconstruction of order parameter in spin-triplet superconductor UTe${}_2$
• Interpretation of some Yb-based valence-fluctuating crystals as approximants to a dodecagonal quasicrystal
• Magnetic ground state and perturbations of the distorted kagome Ising metal TmAgGe
• Noncollinear antiferromagnetic structure and physical properties of CrRhAs with distorted kagome lattice
• Effect of Ni substitution on the fragile magnetic system ${\text{La}}_5{\text{Co}}_2{\text{Ge}}_3$
• Field-induced effects in the spin liquid candidate PbCuTe${}_2$O${}_6$
• Lifshitz Transition in Triangular Lattice Kondo-Heisenberg Model
• Successive Antiferromagnetic Transition in the Frustrated Compound CeMgIn
• Magnetic Field Dependence of the Spin Fluctuations in CeCu${}_{5.8}$Ag${}_{0.2}$
• Magnetic field and pressure tuning of the heavy fermion antiferromagnet CePdIn
• Anisotropic magnetoelastic coupling in the honeycomb magnet Na${}_3$Co${}_2$SbO${}_6$