Crystal growth and structure of R2Ir2O7 (R=Pr, Eu) using molten KF

Millican, Jasmine N.; Macaluso, Robin T.; Nakatsuji, Satoru; Machida, Yo; Maeno, Y.; Chan, Julia Y.

doi:10.1016/j.materresbull.2006.08.011

Cited by 96 publications

(75 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[13]. The appropriate amounts of Pr 6 O 11 (99.9%), and IrO 2 (> 99.9%) were well mixed together and pressed into a pellet.…”

Section: Methodsmentioning

confidence: 99%

Low temperature magnetism of the metallic pyrochlore oxide Pr_2+xIr_2−xO_7+δ

Kimura¹,

Ohta²,

Nakatsuji³

2011

J. Phys.: Conf. Ser.

Self Cite

View full text Add to dashboard Cite

Abstract. Pr 2 Ir 2 O 7 is a metallic pyrochlore compound which has been revealed to form a spin liquid phase by recent studies. Here we report results of magnetic and electrical transport properties of a newly synthesized polycrystalline sample of Pr 2+x Ir 2x O 7+ with excess Pr. A clear anomaly in the temperature dependence of the electrical resistivity is observed at 0.8 K, suggesting a phase transition into some sort of ordered state. IntroductionIt has been widely recognized that geometrical frustration due to certain lattice symmetries based on triangle motifs can be a source stabilizing novel states of matter [1,2]. Particularly, physics of spins residing on a three dimensional pyrochlore lattice consisting of a corner sharing network of tetrahedra has been extensively studied experimentally and theoretically [3,4]. A well-known example is a pyrochlore compound with the general formula A 2 B 2 O 7 (Fd-3m space group), in which both A and B sites individually form a pyrochlore lattice [5] Much attention has been currently devoted to pyrochlore Pr 2 Ir 2 O 7 , a rare example of a metallic frustrated spin system [9][10][11][12]. In this compound, Pr 3+ and Ir 4+ ions carry the localized frustrated magnetism and conduction electrons, respectively, providing a unique opportunity to investigate the correlation between frustrated magnetism and mobile electrons. Indeed, a single crystal study revealed that despite relatively high Weiss temperature of  20 K, the system exhibits no long-range order and instead forms spin liquid state at least down to T f = 110 mK, where a partial spin freezing was found. Besides, the Kondo effect is observed, indicating that the frustrated magnetism correlates with conduction electrons through the Kondo coupling [10]. Furthermore, a spontaneous Hall effect in the absence of uniform magnetization has been discovered in the spin-liquid phase [12]. This observation suggests that Pr 2 Ir 2 O 7 is the first example of a chiral spin liquid where time reversal symmetry is macroscopically broken without magnetic dipole order.In frustrated spin systems, an external perturbation such as magnetic field and chemical disorder often destabilizes a spin liquid state, and, as a result, a novel ordered phase might emerge. Here, we have investigated magnetic and electrical transport properties of a newly synthesized polycrystalline sample of Pr 2+x Ir 2x O 7+ with an off-stoichiometric composition, x = 0.4(3), and found a possible phase transition into some sort of ordered phase. An origin of the phase transition will be discussed.

show abstract

“…[13]. The appropriate amounts of Pr 6 O 11 (99.9%), and IrO 2 (> 99.9%) were well mixed together and pressed into a pellet.…”

Section: Methodsmentioning

confidence: 99%

Low temperature magnetism of the metallic pyrochlore oxide Pr_2+xIr_2−xO_7+δ

Kimura¹,

Ohta²,

Nakatsuji³

2011

J. Phys.: Conf. Ser.

Self Cite

View full text Add to dashboard Cite

show abstract

“…Theoretical studies predict that long-range RKKY interaction in metallic pyrochlore oxides should yield magnetic ordering; on the other hand, local spin correlations of the spin ice can produce non-Kondo mechanism of observed features in the temperature dependences [260,261,262]. The other metallic spin-liquid system, Pr 2 Ir 2 O 7 with Ising-like spins along [111] reveals spontaneous Hall effect [258,263,264,265]. There spin-ice correlations in the liquid phase lead to a non-coplanar spin texture forming a uniform but hidden order parameter, the spin chirality.…”

Section: Metallic Spin Icementioning

confidence: 99%

New physics in frustrated magnets: Spin ices, monopoles, etc. (Review Article)

Zvyagin

2013

Low Temperature Physics

View full text Add to dashboard Cite

During recent years the interest to frustrated magnets has grown considerably. Such systems reveal very peculiar properties which distinguish them from standard paramagnets, magnetically ordered regular systems (like ferro-, ferri-, and antiferromagnets), or spin glasses. In particular great amount of attention has been devoted to the socalled spin ices, in which magnetic frustration together with the large value of the single-ion magnetic anisotropy of a special kind, yield peculiar behavior. One of the most exciting features of spin ices is related to low-energy emergent excitations, which, from many viewpoints can be considered as analogies of Dirac's monopoles. In this article we review the main achievements of theory and experiment in this field of physics.

show abstract

“…Pioneer work by Yanagishima and Maeno reports that it is a nonmagnetic metal 5 , while recent work by Matsuhira et al found a metal-insulator transition with a magnetic ordering in the insulating phase 7,8 . Recent Raman study found a subtle structural symmetry change 19 while the single crystal X-ray indicates no sign of the structural transition 20 . This suggests that Eu 2 Ir 2 O 7 has proximity to a metal-insulator transition and therefore best suited for the study of the interplay between the electronic correlation and spin-orbit coupling.…”

mentioning

confidence: 99%

“…These results are fully consistent with the recent theoretical proposal of the antiferromagnetic insulating ground state with "all-in all-out" spin structure 16,18 . 20 . Powder and single crystal Xray diffraction analyses confirm single phase and the pyrochlore structure with the lattice constant a = 10.274(3) A. Electron probe microanalysis (EPMA) found a slight deviation up to several % from the stoichiometry in the ratio between Eu and Ir contents.…”

mentioning

confidence: 99%

Continuous transition between antiferromagnetic insulator and paramagnetic metal in the pyrochlore iridate Eu2Ir2O7
Ishikawa
¹
,
O’Farrell
²
,
Nakatsuji
³

2012
Phys. Rev. B
Self Cite
115
18
108
2
View full text Add to dashboard Cite

Our single crystal study of the magneto-thermal and transport properties of the pyrochlore iridate Eu2Ir2O7 reveals a continuous phase transition from a paramagnetic metal to an antiferromagnetic insulator for a sample with stoichiometry within ∼1 % resolution. The insulating phase has strong proximity to an antiferromagnetic semimetal, which is stabilized by several % level of the offstoichiometry. Our observations suggest that in addition to electronic correlation and spin-orbit coupling the magnetic order is essential for opening the charge gap.

show abstract

Crystal growth and structure of R2Ir2O7 (R=Pr, Eu) using molten KF

Cited by 96 publications

References 22 publications

Low temperature magnetism of the metallic pyrochlore oxide Pr_2+xIr_2−xO_7+δ

Low temperature magnetism of the metallic pyrochlore oxide Pr_2+xIr_2−xO_7+δ

New physics in frustrated magnets: Spin ices, monopoles, etc. (Review Article)

Continuous transition between antiferromagnetic insulator and paramagnetic metal in the pyrochlore iridate Eu2Ir2O7
Ishikawa
¹
,
O’Farrell
²
,
Nakatsuji
³

2012
Phys. Rev. B
Self Cite
115
18
108
2
View full text Add to dashboard Cite

Contact Info

Product

Resources

About

Crystal growth and structure of R2Ir2O7 (R=Pr, Eu) using molten KF

Cited by 96 publications

References 22 publications

Low temperature magnetism of the metallic pyrochlore oxide Pr2+xIr2−xO7+δ

Low temperature magnetism of the metallic pyrochlore oxide Pr2+xIr2−xO7+δ

New physics in frustrated magnets: Spin ices, monopoles, etc. (Review Article)

Continuous transition between antiferromagnetic insulator and paramagnetic metal in the pyrochlore iridate Eu2Ir2O7Ishikawa1, O’Farrell2, Nakatsuji3 2012Phys. Rev. BSelf Cite115181082View full textAdd to dashboardCite

Contact Info

Product

Resources

About

Low temperature magnetism of the metallic pyrochlore oxide Pr_2+xIr_2−xO_7+δ

Low temperature magnetism of the metallic pyrochlore oxide Pr_2+xIr_2−xO_7+δ

Continuous transition between antiferromagnetic insulator and paramagnetic metal in the pyrochlore iridate Eu2Ir2O7
Ishikawa
¹
,
O’Farrell
²
,
Nakatsuji
³

2012
Phys. Rev. B
Self Cite
115
18
108
2
View full text Add to dashboard Cite