Abstract
Dy_{2}Zr_{2}O_{7} a disordered pyrochlore system, exhibits the spin freezing behavior under the application of the magnetic field. We have performed detailed magnetic studies of Dy_{2-textit{x}}La_textit{x}Zr_{2}O_{7} to understand the evolution of the magnetic spin freezing in the system. Our studies suggest the stabilization of the pyrochlore phase with the substitution of non-magnetic La along with the biphasic mixture of fluorite and pyrochlore phases for the intermediate compositions. We observed that the spin freezing (T_{f}sim 17 K) at higher La compositions (1.5 letextit{x}le 1.99) is similar to the field-induced spin freezing for low La compositions (0 letextit{x}le 0.5) and the well-known spin ice systems Dy_{2}Ti_{2}O_{7} and Ho_{2}Ti_{2}O_{7}. The low-temperature magnetic state for higher La compositions (1.5 letextit{x}le 1.99) culminates into a spin-glass like state below 6 K. Cole–Cole plot and Casimir-du Pracute{e} fit shows the narrow distribution of spin relaxation time in these compounds.
Highlights
Dy2Zr2O7 a disordered pyrochlore system, exhibits the spin freezing behavior under the application of the magnetic field
Dy2Zr2O7 (DZO) is quite fascinating, as it shows the emergence of the magnetic field induced spin freezing near 10 K and possess the magnetic entropy of R[ln2 – (1/2)ln(3/2)] in the presence of magnetic field of 5 kOe, which is same as the spin ice Dy2Ti2O723
For 0.5 < x < 1.5, a few super-structure peaks corresponding to pyrochlore structure appear at 2 θ = 14◦ (111), 27◦ (311), 37◦ (331), 45◦ (511), etc. and the main peaks belonging to pyrochlore structure get split
Summary
Dy2Zr2O7 a disordered pyrochlore system, exhibits the spin freezing behavior under the application of the magnetic field. A and B sites form a network of corner-sharing tetrahedra, a quintessential framework for a geometrically frustrated magnet These materials display a variety of exotic phases like spin ice (Dy2Ti2O7 and Ho2Ti2O7 ), spin liquid (Tb2Ti2O7 ), spin glass (Y2 Mo2O7 ), order by disorder (Er2Ti2O7 ), Kondo effect (Pr2Ir2O7 ), unconventional anomalous Hall effect (Nd2 Mo2O7 ), superconductivity (Cd2Re2O7 ), etc.[3,4,5,6,7,8,9,10]. Some of the pyrochlore magnets show spin glass transition, even in the absence of quenched disorder, which is indistinguishable to the typical spin glass s ystems[20,21,22] Among these pyrochlore systems, Dy2Zr2O7 (DZO) is quite fascinating, as it shows the emergence of the magnetic field induced spin freezing near 10 K and possess the magnetic entropy of R[ln2 – (1/2)ln(3/2)] in the presence of magnetic field of 5 kOe, which is same as the spin ice Dy2Ti2O723.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
