Multiple lattice instabilities resolved by magnetic-field and disorder sensitivities in cubic paramagnetic phase of the orbital-degenerate frustrated spinel MgV${}_2$O${}_4$

Abstract

Ultrasound velocity measurements of the orbital-degenerate frustrated spinel MgV${}_2$O${}_4$ are performed in the high-purity single crystal which exhibits successive structural and antiferromagnetic phase transitions, and in the disorder-introduced single crystal which exhibits spin-glass-like behavior. The measurements reveal that two-types of unusual temperature dependence of the elastic moduli coexist in the cubic paramagnetic phase, which are resolved by magnetic-field and disorder sensitivities: huge Curie-type softening with decreasing temperature, and concave temperature dependence with a characteristic minimum. These elastic anomalies suggest the coupling of lattice to coexisting orbital fluctuations and orbital-spin-coupled excitations.

arXiv comment5 pages, 3 figures

References in corpus (19)

• Emergent excitations in a geometrically frustrated magnet
• Local spin resonance and spin-Peierls-like phase transition in a geometrically frustrated antiferromagnet
• Magnetic and orbital ordering in the spinel MnV2O4
• Structural, orbital, and magnetic order in vanadium spinels
• Orbital and spin chains in ZnV2O4
• Magnetic transition and orbital degrees of freedom in vanadium spinels
• Spin and Orbital Order of the Vanadium Spinel MgV2O4
• Orbital order in ZnV${}_2$O${}_4$
• Proposed Orbital Ordering in MnV2O4 from First-principles Calculations
• CdV2O4: A rare example of a collinear multiferroic spinel
• Molecular spin resonance in the geometrically frustrated MgCr2O4 magnet by inelastic neutron scattering
• Orbital order in vanadium spinels
• Homopolar bond formation in ZnV${}_2$O${}_4$ close to a metal-insulator transition
• Emergence of highly degenerate excited states in frustrated magnet MgCr${}_2$O${}_4$
• Soundwave Anomalies in SrCu_{2}(BO_{3})_{2}
• Jahn-Teller Inactivity and Magnetic Frustration in GeCo${}_2$O${}_4$ Probed by Ultrasound Velocity Measurements
• Elastic Instabilities within Antiferromagnetically Ordered Phase in the Orbitally-Frustrated Spinel GeCo${}_2$O${}_4$
• Observation of elastic anomalies driven by coexisting dynamical spin Jahn-Teller effect and dynamical molecular spin state in paramagnetic phase of the frustrated MgCr${}_2$O${}_4$$
• Effect of spin-orbit coupling on magnetic and orbital order in MgV${}_2$O${}_4$

Cited by in corpus (8)

• Acoustic study for dynamical molecular-spin state without undergoing magnetic phase transition in spin-frustrated ZnFe${}_2$O${}_4$
• Orbital- and spin-driven lattice instabilities in quasi-one-dimensional CaV${}_2$O${}_4$
• A variety of elastic anomalies in orbital-active nearly-itinerant cobalt vanadate spinel
• Spin-orbital correlations from complex orbital order in MgV${}_2$O${}_4$
• Transverse acoustic phonon anomalies at intermediate wavevectors in MgV${}_2$O${}_4$
• Softening of breathing elastic mode and trigonal elastic mode in disordered pyrochlore magnet NaCaCo${}_2$F${}_7$
• Symmetry-resolved elastic anomalies in spin-crossover cobaltite LaCoO${}_3$
• Elastic softness of low-symmetry frustrated $A$Ti${}_2$O${}_5$ ($A$ = Co, Fe)