Magnetic properties and crystal field splitting of the rare-earth pyrochlore Er2Ir2O7

Abstract

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The magnetic behaviour of Dy2Ir2O7 – Beyond the mean field approximation

“…Of course, first explanation of the anomaly could be found in the usage of Lu2Ir2O7 data as 'non-magnetic' analogue. Supposing (i) the CIr is almost identical within the series, which is, to a certain degree, confirmed investigating the specific heat of other A2Ir2O7 (13), (21); and (ii) the Cel is similar for all the rare-earth analogues; the Cph contribution, dependent specially on atomic properties of Dy and Lu, could be responsible for observed anomaly. Previously used Eu2Ir2O7 data represent a better choice to obtain CDy (12), (16).…”

“…(12). We highlight that the agreement between data and calculations was significantly better for previously studied heavy rare-earth A2Ir2O7 (13), (21).…”

“…The specific heat measurement at temperatures 0.4 -300 K was performed using PPMS, Quantum design, equipped with the 3 He insert. The magnetic susceptibility in the temperature range 1.8 -330 K was measured employing superconducting quantum interference device magnetometer (MPMS7, Quantum design); the low-temperature data (down to 0.4 K) were collected using a PPMS equipped with 3 He insert and custom-made Hall probes option (13), (20), (21).…”

Neutron scattering study of the Tm2Ir2O7 pyrochlore iridate

“…About 3% of unreacted A 2 O 3 oxides was evidenced in the samples of total mass 4.2 and 5.7 g, while the Tm 2 Ir 2 O 7 sample (6.9 g) later used for inelastic neutron scattering experiment contained about 12% of unreacted Tm 2 O 3 . Unreacted initial oxides in the sample are a common problem preparing A 2 Ir 2 O 7 iridates [5,10,13,25,28] due to significantly different melting temperatures of initial oxides and heavy sublimation of iridium dioxide (in contrast with, e.g., isostructural rare-earth titanates [29] or zirconates [36]). The decomposition and evaporation of IrO 2 are mostly suppressed using the flux, in which the oxides are dissolved, allowing a lower reaction temperature [27].…”

“…In addition to the long-range Ir order, the induced A order (of magnetic rare-earth ions), and the A-A magnetic correlations, the low-temperature behavior of A 2 Ir 2 O 7 is defined by the A single-ion properties, namely the crystal field (CF) acting on the A cation. The crystal-field schemes of heavy rare-earth A 2 Ir 2 O 7 compounds have been studied systematically by inelastic neutron scattering-Dy 2 Ir 2 O 7 [8], Ho 2 Ir 2 O 7 [9], Er 2 Ir 2 O 7 [25], and Yb 2 Ir 2 O 7 [23]-and confronted with macroscopic data [20,25,26]. Recently, we synthesized and thoroughly characterized the previously unreported Tm 2 Ir 2 O 7 member of the family [20].…”