title: Anisotropy-Tuned Magnetic Order in Pyrochlore Iridates.
abstract: The magnetic behavior of polycrystalline samples of Er(2)Ir(2)O(7) and Tb(2)Ir(2)O(7) pyrochlores is studied by magnetization measurements and neutron diffraction. Both compounds undergo a magnetic transition at 140 and 130 K, respectively, associated with an ordering of the Ir sublattice, signaled by thermomagnetic hysteresis. In Tb(2)Ir(2)O(7), we show that the Ir molecular field leads the Tb magnetic moments to order below 40 K in the all-in-all-out magnetic arrangement. No sign of magnetic long-range order on the Er sublattice is evidenced in Er(2)Ir(2)O(7) down to 0.6 K where a spin freezing is detected. These contrasting behaviors result from the competition between the Ir molecular field and the different single-ion anisotropy of the rare-earth elements on which it is acting. Additionally, this strongly supports the all-in-all-out iridium magnetic order.
authors.affiliation: Institut Laue Langevin, CS 20156, 38042 Grenoble, France.|CNRS, Institut Néel, 38042 Grenoble, France.|Univ. Grenoble Alpes, Institut Néel, 38042 Grenoble, France.
authors.forename: E
authors.initials: E
authors.lastname: Lefrançois
authors.affiliation: CNRS, Institut Néel, 38042 Grenoble, France.|Univ. Grenoble Alpes, Institut Néel, 38042 Grenoble, France.
authors.forename: V
authors.initials: V
authors.lastname: Simonet
authors.affiliation: CNRS, Institut Néel, 38042 Grenoble, France.|Univ. Grenoble Alpes, Institut Néel, 38042 Grenoble, France.
authors.forename: R
authors.initials: R
authors.lastname: Ballou
authors.affiliation: CNRS, Institut Néel, 38042 Grenoble, France.|Univ. Grenoble Alpes, Institut Néel, 38042 Grenoble, France.
authors.forename: E
authors.initials: E
authors.lastname: Lhotel
authors.affiliation: CNRS, Institut Néel, 38042 Grenoble, France.|Univ. Grenoble Alpes, Institut Néel, 38042 Grenoble, France.
authors.forename: A
authors.initials: A
authors.lastname: Hadj-Azzem
authors.affiliation: CNRS, Institut Néel, 38042 Grenoble, France.|Univ. Grenoble Alpes, Institut Néel, 38042 Grenoble, France.
authors.forename: S
authors.initials: S
authors.lastname: Kodjikian
authors.affiliation: CNRS, Institut Néel, 38042 Grenoble, France.|Univ. Grenoble Alpes, Institut Néel, 38042 Grenoble, France.
authors.forename: P
authors.initials: P
authors.lastname: Lejay
authors.affiliation: ISIS Facility, Rutherford Appleton Laboratory-STFC, Chilton, Didcot OX11 0QX, United Kingdom.
authors.forename: P
authors.initials: P
authors.lastname: Manuel
authors.affiliation: ISIS Facility, Rutherford Appleton Laboratory-STFC, Chilton, Didcot OX11 0QX, United Kingdom.
authors.forename: D
authors.initials: D
authors.lastname: Khalyavin
authors.affiliation: Institut Laue Langevin, CS 20156, 38042 Grenoble, France.
authors.forename: L C
authors.initials: LC
authors.lastname: Chapon