Magnetic interactions and spin dynamics in the bond-disordered pyrochlore fluoride NaCaCo2F7

Zeisner, J.; Bräuninger, S. A.; Opherden, L.; Sarkar, R.; Gorbunov, D. I.; Krizan, J. W.; Herrmannsdörfer, T.; Cava, R. J.; Wosnitza, J.; Büchner, B.; Klauss, H. -H.; Kataev, V.

doi:10.1103/physrevb.99.155104

Title: Magnetic interactions and spin dynamics in the bond-disordered pyrochlore fluoride ${NaCaCo}_{2} F_{7}$

Journal Article · Mon Apr 01 00:00:00 EDT 2019 · Physical Review B

DOI:https://doi.org/10.1103/physrevb.99.155104· OSTI ID:1610025

Zeisner, J. ^[1]; Bräuninger, S. A. ^[2]; Opherden, L. ^[3]; Sarkar, R. ^[2]; Gorbunov, D. I. ^[3]; Krizan, J. W. ^[4]; Herrmannsdörfer, T. ^[3]; Cava, R. J. ^[4]; Wosnitza, J. ^[5]; Büchner, B. ^[1]; Klauss, H. -H. ^[2]; Kataev, V. ^[6]

Leibniz Inst. for Solid State and Materials Research IFW Dresden (Germany); TU Dresden (Germany)
TU Dresden (Germany)
Helmholtz-Zentrum Dresden-Rossendorf, Dresden (Germany)
Princeton Univ., NJ (United States)
TU Dresden (Germany); Helmholtz-Zentrum Dresden-Rossendorf, Dresden (Germany)
Leibniz Inst. for Solid State and Materials Research IFW Dresden (Germany)

We report high-frequency/high-field electron spin resonance (ESR) and high-field magnetization studies on single crystals of the bond-disordered pyrochlore NaCaCo₂F₇. Frequency- and temperature-dependent ESR investigations above the freezing temperature T_f ~ 2.4 K reveal the coexistence of two distinct magnetic phases. Here, a cooperative paramagnetic phase, evidenced by a gapless excitation mode, is found along with a spin-glass phase developing below 20 K which is associated with a gapped low-energy excitation. Effective g factors close to 2 are obtained for both modes, in line with pulsed high-field magnetization measurements which show an unsaturated isotropic behavior up to 58 T at 2 K. In order to describe the field-dependent magnetization in high magnetic fields, we propose an empirical model accounting for highly anisotropic ionic g tensors expected for this material and taking into account the strongly competing interactions between the spins which lead to a frustrated ground state. As a detailed quantitative relation between effective g factors as determined from ESR and the local g tensors obtained by neutron scattering is still sought after, our work motivates further theoretical investigations of the low-energy excitations in bond-disordered pyrochlores.

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Research Organization:: Johns Hopkins Univ., Baltimore, MD (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: FG02-08ER46544

OSTI ID:: 1610025

Alternate ID(s):: OSTI ID: 1504536

Journal Information:: Physical Review B, Vol. 99, Issue 15; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 4 works

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Title: Magnetic interactions and spin dynamics in the bond-disordered pyrochlore fluoride NaCaCo 2 F 7

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References (25)

Figures / Tables (8)

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Title: Magnetic interactions and spin dynamics in the bond-disordered pyrochlore fluoride ${NaCaCo}_{2} F_{7}$