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 ${NaCaCo}_{2} F_{7}$

Abstract

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.

Authors:

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)

Publication Date:: Mon Apr 01 00:00:00 EDT 2019

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

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

OSTI Identifier:: 1610025

Alternate Identifier(s):: OSTI ID: 1504536

Grant/Contract Number:: FG02-08ER46544

Resource Type:: Accepted Manuscript

Journal Name:: Physical Review B

Additional Journal Information:: Journal Volume: 99; Journal Issue: 15; Journal ID: ISSN 2469-9950

Publisher:: American Physical Society (APS)

Country of Publication:: United States

Language:: English

Subject:: 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; material science; physics; frustrated magnetism; magnetic insulators; pyrochlore; electron spin resonance; magnetization measurements

Citation Formats


                    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., and Kataev, V. Magnetic interactions and spin dynamics in the bond-disordered pyrochlore fluoride NaCaCo2F7.  United States: N. p., 2019. 
Web.  doi:10.1103/physrevb.99.155104.

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                    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. Magnetic interactions and spin dynamics in the bond-disordered pyrochlore fluoride NaCaCo2F7.  United States.  https://doi.org/10.1103/physrevb.99.155104

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                    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., and Kataev, V. Mon .  
"Magnetic interactions and spin dynamics in the bond-disordered pyrochlore fluoride NaCaCo2F7".  United States.  https://doi.org/10.1103/physrevb.99.155104.  https://www.osti.gov/servlets/purl/1610025.

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@article{osti_1610025,

  title        = {Magnetic interactions and spin dynamics in the bond-disordered pyrochlore fluoride NaCaCo2F7},

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

  abstractNote = {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 Tf ~ 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.},

  doi          = {10.1103/physrevb.99.155104},

  journal      = {Physical Review B},

  number       = 15,

  volume       = 99,

  place        = {United States},

  year         = {Mon Apr 01 00:00:00 EDT 2019},

  month        = {Mon Apr 01 00:00:00 EDT 2019}

}

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Cited by: 4 works

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Figures / Tables:

FIG. 1: Temperature evolution of the ESR spectrum at 360 GHz for an external magnetic field applied along the crystallographic direction. Shown spectra are normalized and shifted vertically for better comparison.

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

Abstract

Citation Formats

Figures / Tables:

Spin liquids in frustrated magnets journal, March 2010

Cluster-Glass Phase in Pyrochlore X Y Antiferromagnets with Quenched Disorder journal, March 2018

Magnetic pyrochlore oxides journal, January 2010

Spin freezing in the disordered pyrochlore magnet NaCaCo 2 F 7 : NMR studies and Monte Carlo simulations journal, December 2017

Multifrequency EPR Spectra of Molecular Oxygen in Solid Air journal, October 2000

NaCaN i 2 F 7 : A frustrated high-temperature pyrochlore antiferromagnet with S = 1 N i 2 + journal, July 2015

Exchange energy, magnetization, and Raman scattering of (Cd,Mn)Se journal, May 1984

Experimental Insights into Ground-State Selection of Quantum XY Pyrochlores journal, March 2018

Acoustic signatures of the phases and phase transitions in Yb 2 Ti 2 O 7 journal, April 2016

High-field magnetization of Ho 2 Fe 17 journal, June 2011

Characterization of paramagnetic materials by low-temperature magnetization journal, November 1999

Static and dynamic X Y -like short-range order in a frustrated magnet with exchange disorder journal, January 2016

Notizen: A2B2F7-Verbindungen mit Pyrochlor- und Weberitstruktur journal, November 1970

Single-ion properties of the S eff = 1 2 XY antiferromagnetic pyrochlores Na A ′ Co 2 F 7 ( A ′ = Ca 2 + , Sr 2 + ) journal, April 2017

NaCaCo 2 F 7 : A single-crystal high-temperature pyrochlore antiferromagnet journal, June 2014

Real-space investigation of short-range magnetic correlations in fluoride pyrochlores NaCaCo 2 F 7 and NaSrCo 2 F 7 with magnetic pair distribution function analysis journal, December 2017

Ground state and low-energy magnetic dynamics in the frustrated magnet CoAl 2 O 4 as revealed by local spin probes journal, April 2015

NaSrCo 2 F 7 , a Co 2+ pyrochlore antiferromagnet journal, July 2015

Low-temperature magnetisation process in the cubic pyrochlore quantum antiferromagnet, Er2Ti2O7 journal, October 2013

Theory of multiple-phase competition in pyrochlore magnets with anisotropic exchange with application to Yb 2 Ti 2 O 7 , Er 2 Ti 2 O 7 , and Er 2 Sn 2 O 7 journal, March 2017

NaSrMn 2 F 7 , NaCaFe 2 F 7 , and NaSrFe 2 F 7 : novel single crystal pyrochlore antiferromagnets journal, November 2016

Titanium pyrochlore magnets: how much can be learned from magnetization measurements? journal, April 2011

Strongly Geometrically Frustrated Magnets journal, August 1994

Field-induced phase diagram of the XY pyrochlore antiferromagnet Er 2 Ti 2 O 7 journal, April 2017

Magnetic resonance spectroscopy on the spin-frustrated magnets YBaCo 3 M O 7 ( M =Al, Fe) journal, August 2017

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

Spin liquids in frustrated magnets
journal, March 2010

Cluster-Glass Phase in Pyrochlore $X Y$ Antiferromagnets with Quenched Disorder
journal, March 2018

Magnetic pyrochlore oxides
journal, January 2010

Spin freezing in the disordered pyrochlore magnet ${NaCaCo}_{2} F_{7}$ : NMR studies and Monte Carlo simulations
journal, December 2017

Multifrequency EPR Spectra of Molecular Oxygen in Solid Air
journal, October 2000

$NaCaN i_{2} F_{7}$ : A frustrated high-temperature pyrochlore antiferromagnet with $S = 1 N i^{2 +}$
journal, July 2015

Exchange energy, magnetization, and Raman scattering of (Cd,Mn)Se
journal, May 1984

Experimental Insights into Ground-State Selection of Quantum XY Pyrochlores
journal, March 2018

Acoustic signatures of the phases and phase transitions in ${Yb}_{2} {Ti}_{2} O_{7}$
journal, April 2016

High-field magnetization of Ho $_{2}$ Fe $_{17}$
journal, June 2011

Characterization of paramagnetic materials by low-temperature magnetization
journal, November 1999

Static and dynamic $X Y$ -like short-range order in a frustrated magnet with exchange disorder
journal, January 2016

Notizen: A2B2F7-Verbindungen mit Pyrochlor- und Weberitstruktur
journal, November 1970

Single-ion properties of the $S_{eff}$ = $\frac{1}{2}$ XY antiferromagnetic pyrochlores $Na A^{'} {Co}_{2} F_{7}$ ( $A^{'} = {Ca}^{2 +}, {Sr}^{2 +}$ )
journal, April 2017

${NaCaCo}_{2} F_{7}$ : A single-crystal high-temperature pyrochlore antiferromagnet
journal, June 2014

Real-space investigation of short-range magnetic correlations in fluoride pyrochlores ${NaCaCo}_{2} F_{7}$ and ${NaSrCo}_{2} F_{7}$ with magnetic pair distribution function analysis
journal, December 2017

Ground state and low-energy magnetic dynamics in the frustrated magnet ${CoAl}_{2} O_{4}$ as revealed by local spin probes
journal, April 2015

NaSrCo ₂ F ₇ , a Co ²⁺ pyrochlore antiferromagnet
journal, July 2015

Low-temperature magnetisation process in the cubic pyrochlore quantum antiferromagnet, Er2Ti2O7
journal, October 2013

Theory of multiple-phase competition in pyrochlore magnets with anisotropic exchange with application to ${Yb}_{2} {Ti}_{2} O_{7}, {Er}_{2} {Ti}_{2} O_{7}$ , and ${Er}_{2} {Sn}_{2} O_{7}$
journal, March 2017

NaSrMn ₂ F ₇ , NaCaFe ₂ F ₇ , and NaSrFe ₂ F ₇ : novel single crystal pyrochlore antiferromagnets
journal, November 2016

Titanium pyrochlore magnets: how much can be learned from magnetization measurements?
journal, April 2011

Strongly Geometrically Frustrated Magnets
journal, August 1994

Field-induced phase diagram of the XY pyrochlore antiferromagnet ${Er}_{2} {Ti}_{2} O_{7}$
journal, April 2017

Magnetic resonance spectroscopy on the spin-frustrated magnets ${YBaCo}_{3} M O_{7}$ ( $M$ =Al, Fe)
journal, August 2017