Beyond magnons in Nd2ScNbO7: An Ising pyrochlore antiferromagnet with all-in–all-out order and random fields

Scheie, Allen; Sanders, Marisa; Gui, Xin; Qiu, Yiming; Prisk, T. R.; Cava, Robert; Broholm, Collin L.

doi:10.1103/physrevb.104.134418

Title: Beyond magnons in Nd₂ScNbO₇: An Ising pyrochlore antiferromagnet with all-in–all-out order and random fields

Abstract

We report the low-temperature magnetic properties of Nd³⁺ pyrochlore Nd₂ScNbO₇. Susceptibility and magnetization show an easy-axis moment, and heat capacity reveals a phase transition to long-range order at T_N=371(2) mK with a fully recovered ΔS=Rln(2), 53% of it recovered for T>T_N. Elastic neutron scattering shows a long-range all-in all-out magnetic order with low-Q diffuse elastic scattering. Inelastic neutron scattering shows a low-energy flat band, indicating a magnetic Hamiltonian similar to Nd₂Zr₂O₇. Nuclear hyperfine excitations measured by ultra-high-resolution neutron backscattering indicate a distribution of static electronic moments below T_N, which may be due to B-site disorder influencing Nd crystal electric fields. Analysis of heat-capacity data shows an unexpected T-linear or T^3/2 term which is inconsistent with conventional magnon quasiparticles, but is consistent with fractionalized spinons or gapless local spin excitations. We use legacy data to show similar behavior in Nd₂Zr₂O₇. Comparing local static moments also reveals a suppression of the nuclear Schottky anomaly in temperature, evidencing a fraction of Nd sites with nearly zero static moment, consistent with exchange-disorder-induced random singlet formation. Finally, taken together, these measurements suggest an unusual fluctuating magnetic ground state which mimics a spin liquid, but may not actually be one.

Authors:

^[1];

^[2]; Gui, Xin ^[2];

^[3];

^[3]; Cava, Robert ^[2]; Broholm, Collin L. ^[4]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Johns Hopkins Univ., Baltimore, MD (United States)
Princeton Univ., NJ (United States)
National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States)
Johns Hopkins Univ., Baltimore, MD (United States); National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States)

Publication Date:: Wed Oct 20 00:00:00 EDT 2021

Research Org.:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

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

OSTI Identifier:: 1831679

Grant/Contract Number:: AC05-00OR22725

Resource Type:: Accepted Manuscript

Journal Name:: Physical Review B

Additional Journal Information:: Journal Volume: 104; Journal Issue: 13; 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; frustrated magnetism; phase transitions; quantum spin liquid; specific heat; pyrochlore; neutron diffraction; neutron scattering; quasi elastic neutron scattering

Citation Formats


                    Scheie, Allen, Sanders, Marisa, Gui, Xin, Qiu, Yiming, Prisk, T. R., Cava, Robert, and Broholm, Collin L. Beyond magnons in Nd2ScNbO7: An Ising pyrochlore antiferromagnet with all-in–all-out order and random fields.  United States: N. p., 2021. 
Web.  doi:10.1103/physrevb.104.134418.

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                    Scheie, Allen, Sanders, Marisa, Gui, Xin, Qiu, Yiming, Prisk, T. R., Cava, Robert, & Broholm, Collin L. Beyond magnons in Nd2ScNbO7: An Ising pyrochlore antiferromagnet with all-in–all-out order and random fields.  United States.  https://doi.org/10.1103/physrevb.104.134418

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                    Scheie, Allen, Sanders, Marisa, Gui, Xin, Qiu, Yiming, Prisk, T. R., Cava, Robert, and Broholm, Collin L. Wed .  
"Beyond magnons in Nd2ScNbO7: An Ising pyrochlore antiferromagnet with all-in–all-out order and random fields".  United States.  https://doi.org/10.1103/physrevb.104.134418.  https://www.osti.gov/servlets/purl/1831679.

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@article{osti_1831679,

  title        = {Beyond magnons in Nd2ScNbO7: An Ising pyrochlore antiferromagnet with all-in–all-out order and random fields},

  author       = {Scheie, Allen and Sanders, Marisa and Gui, Xin and Qiu, Yiming and Prisk, T. R. and Cava, Robert and Broholm, Collin L.},

  abstractNote = {We report the low-temperature magnetic properties of Nd3+ pyrochlore Nd2ScNbO7. Susceptibility and magnetization show an easy-axis moment, and heat capacity reveals a phase transition to long-range order at TN=371(2) mK with a fully recovered ΔS=Rln(2), 53% of it recovered for T>TN. Elastic neutron scattering shows a long-range all-in all-out magnetic order with low-Q diffuse elastic scattering. Inelastic neutron scattering shows a low-energy flat band, indicating a magnetic Hamiltonian similar to Nd2Zr2O7. Nuclear hyperfine excitations measured by ultra-high-resolution neutron backscattering indicate a distribution of static electronic moments below TN, which may be due to B-site disorder influencing Nd crystal electric fields. Analysis of heat-capacity data shows an unexpected T-linear or T3/2 term which is inconsistent with conventional magnon quasiparticles, but is consistent with fractionalized spinons or gapless local spin excitations. We use legacy data to show similar behavior in Nd2Zr2O7. Comparing local static moments also reveals a suppression of the nuclear Schottky anomaly in temperature, evidencing a fraction of Nd sites with nearly zero static moment, consistent with exchange-disorder-induced random singlet formation. Finally, taken together, these measurements suggest an unusual fluctuating magnetic ground state which mimics a spin liquid, but may not actually be one.},

  doi          = {10.1103/physrevb.104.134418},

  journal      = {Physical Review B},

  number       = 13,

  volume       = 104,

  place        = {United States},

  year         = {Wed Oct 20 00:00:00 EDT 2021},

  month        = {Wed Oct 20 00:00:00 EDT 2021}

}

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DOI: 10.1088/1361-648X/abf594

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Magnetic ordering in the Ising antiferromagnetic pyrochlore Nd₂ScNbO₇

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The question of structural disorder and its effects on magnetism is relevant to a number of spin liquid candidate materials. Although commonly thought of as a route to spin glass behaviour, here we describe a system in which the structural disorder results in long-range antiferromagnetic order due to local symmetry breaking. Nd₂ScNbO₇ is shown to have a dispersionless gapped excitation observed in other neodymium pyrochlores below T_N = 0.37 K through polarized and inelastic neutron scattering. However the dispersing spin waves are not observed. This excited mode is shown to occur in only 14(2)% of the neodymium ions through spectroscopymore »« less
https://doi.org/10.1088/1361-648x/abf594

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Quantum spin liquid (QSL) is a disordered state of quantum-mechanically entangled spins commonly arising from frustrated magnetic dipolar interactions. However, QSL in some pyrochlore magnets can also come from frustrated magnetic octupolar interactions. Although the key signature for both dipolar and octupolar interaction-driven QSL is the presence of a spin excitation continuum (spinons) arising from the spin quantum number fractionalization, an external magnetic field-induced ferromagnetic order will transform the spinons into conventional spin waves in a dipolar QSL. By contrast, in an octupole QSL, the spin waves carry octupole moments that do not couple, in the leading order, to anmore »« less
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Title: Beyond magnons in Nd2ScNbO7: An Ising pyrochlore antiferromagnet with all-in–all-out order and random fields

Abstract

Citation Formats

Randomness-Induced Quantum Spin Liquid Behavior in the s = 1 / 2 Random-Bond Heisenberg Antiferromagnet on the Pyrochlore Lattice journal, August 2019

Matrix Elements and Operator Equivalents Connected with the Magnetic Properties of Rare Earth Ions journal, March 1952

Spin Dynamics and Unconventional Coulomb Phase in Nd 2 Zr 2 O 7 journal, June 2021

Quantum spin fluctuations in the dipolar Heisenberg-like rare earth pyrochlores journal, May 2004

Thermodynamic properties of a spin-1/2 spin-liquid state in a κ-type organic salt journal, April 2008

Hyperfine structure in the configurations4f 4 6s 2 and4f 4 5d 6s of Nd I journal, March 1992

Observation of long-range magnetic ordering in pyrohafnate Nd 2 Hf 2 O 7 : A neutron diffraction study journal, November 2015

Evolution of antiferromagnetic domains in the all-in-all-out ordered pyrochlore Nd 2 Zr 2 O 7 journal, May 2017

Low-temperature excitations in spin glasses: evidence for a T 3/2 behaviour journal, January 1981

Quantum spin liquids: a review journal, November 2016

Role of the electrostatic model in calculating rare-earth crystal-field parameters journal, July 1998

Sample independence of magnetoelastic excitations in the rare-earth pyrochlore Tb 2 Ti 2 O 7 journal, April 2016

Direct Observation of a Nuclear Spin Excitation in Ho 2 Ti 2 O 7 journal, January 2009

Emergent order in the kagome Ising magnet Dy3Mg2Sb3O14 journal, December 2016

Recent advances in magnetic structure determination by neutron powder diffraction journal, October 1993

Pyrochlore Antiferromagnet: A Three-Dimensional Quantum Spin Liquid journal, March 1998

Observation of magnetic fragmentation in spin ice journal, April 2016

Point-Charge Calculations of Energy Levels of Magnetic Ions in Crystalline Electric Fields book, January 1964

Field-induced quantum spin- 1 2 chains and disorder in Nd 2 Zr 2 O 7 journal, August 2018

Magnetic structure and crystal-field states of the pyrochlore antiferromagnet Nd 2 Zr 2 O 7 journal, December 2015

Structural and magnetic investigations of single-crystalline neodymium zirconate pyrochlore Nd 2 Zr 2 O 7 journal, May 2015

Hyperfine Interactions in Rare‐Earth Metals journal, April 1963

Nature of the randomness-induced quantum spin liquids in two dimensions journal, September 2019

Low-energy nuclear spin excitations in NdMg 3 and NdCo 2 journal, July 2008

Effective spin- 1 2 scalar chiral order on kagome lattices in Nd 3 Sb 3 Mg 2 O 14 journal, May 2016

Fragmented monopole crystal, dimer entropy, and Coulomb interactions in Dy 2 Ir 2 O 7 journal, September 2020

Fluctuations and All-In–All-Out Ordering in Dipole-Octupole Nd 2 Zr 2 O 7 journal, November 2015

Homogeneous reduced moment in a gapful scalar chiral kagome antiferromagnet journal, July 2019

Synthesis and structure of new pyrochlore-type oxides Ln2ScNbO7 (Ln=Pr, Nd, Eu, Gd, Dy) journal, August 2008

Low-temperature specific heat and possible gap to magnetic excitations in the Heisenberg pyrochlore antiferromagnet Gd 2 Sn 2 O 7 journal, August 2007

Linear spin wave theory for single-Q incommensurate magnetic structures journal, March 2015

A quantum liquid of magnetic octupoles on the pyrochlore lattice journal, March 2020

Evidence for Gapped Spin-Wave Excitations in the Frustrated Gd 2 Sn 2 O 7 Pyrochlore Antiferromagnet from Low-Temperature Specific Heat Measurements journal, August 2007

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

Fragmentation in spin ice from magnetic charge injection journal, August 2017

The pyrochlore Ho2Ti2O7: Synthesis, crystal growth, and stoichiometry journal, October 2018

Quantum Spin Ice Dynamics in the Dipole-Octupole Pyrochlore Magnet Ce 2 Zr 2 O 7 journal, May 2019

Magnetic Order with Fractionalized Excitations in Pyrochlore Magnets with Strong Spin-Orbit Coupling journal, July 2019

A time-of-flight backscattering spectrometer at the Spallation Neutron Source, BASIS journal, August 2011

Crystal field levels and magnetic anisotropy in the kagome compounds Nd 3 Sb 3 Mg 2 O 14 , Nd 3 Sb 3 Zn 2 O 14 , and Pr 3 Sb 3 Mg 2 O 14 journal, October 2018

SciPy 1.0: fundamental algorithms for scientific computing in Python journal, February 2020

Massive electron state in YbBiPt journal, December 1991

Coulombic Quantum Liquids in Spin- 1 / 2 Pyrochlores journal, January 2012

Proximate Kitaev quantum spin liquid behaviour in a honeycomb magnet journal, April 2016

Spin dynamics of the ordered dipolar-octupolar pseudospin- 1 2 pyrochlore Nd 2 Zr 2 O 7 probed by muon spin relaxation journal, August 2016

Spin liquids in frustrated magnets journal, March 2010

Disorder-Induced Quantum Spin Liquid in Spin Ice Pyrochlores journal, February 2017

Quantum spin liquids journal, January 2020

Anisotropic exchange Hamiltonian, magnetic phase diagram, and domain inversion of Nd 2 Zr 2 O 7 journal, April 2019

Bestimmung des inneren Magnetfeldes in V2O3 mit Hilfe der inelastischen Spin-Flip-Streuung von Neutronen journal, June 1970

Pyrochlore photons: The U ( 1 ) spin liquid in a S = 1 2 three-dimensional frustrated magnet journal, February 2004

Nd 2 Sn 2 O 7 : An all-in–all-out pyrochlore magnet with no divergence-free field and anomalously slow paramagnetic spin dynamics journal, October 2015

Measurement of the spin-excitation continuum in one-dimensional KCuF 3 using neutron scattering journal, November 1995

Fragmentation in Frustrated Magnets: A Review journal, September 2020

Competing orders in pyrochlore magnets from a Z 2 spin liquid perspective journal, August 2019

Unbound spinons in the S =1/2 antiferromagnetic chain KCuF 3 journal, June 1993

The high-flux backscattering spectrometer at the NIST Center for Neutron Research journal, May 2003

Quantum Spin Ices and Topological Phases from Dipolar-Octupolar Doublets on the Pyrochlore Lattice journal, April 2014

Magnetism of neodymium trifluoromethanesulfonate nonahydrate and effects of the crystal field journal, June 1999

Magnetic-Moment Fragmentation and Monopole Crystallization journal, January 2014

Critical phenomena and renormalization-group theory journal, October 2002

Heat-capacity measurements on rare-earth double oxides R2M2O7 journal, September 1969

Thermal transport for probing quantum materials journal, May 2020

Specific heat of NM-TM spin glasses journal, March 1989

Quantum Versus Classical Spin Fragmentation in Dipolar Kagome Ice Ho 3 Mg 2 Sb 3 O 14 journal, September 2020

Impact of stoichiometry of Yb 2 Ti 2 O 7 on its physical properties journal, March 2017

A new protocol for the determination of magnetic structures using simulated annealing and representational analysis (SARAh) journal, March 2000

A Field Guide to Spin Liquids journal, March 2019

Experimental signatures of a three-dimensional quantum spin liquid in effective spin-1/2 Ce2Zr2O7 pyrochlore journal, July 2019

Quantum spin ice: a search for gapless quantum spin liquids in pyrochlore magnets journal, May 2014

Quantum spin liquid at finite temperature: Proximate dynamics and persistent typicality journal, July 2019

Spin glasses: Experimental facts, theoretical concepts, and open questions journal, October 1986

Quantum origins of moment fragmentation in Nd 2 Zr 2 O 7 journal, September 2016

Order out of a Coulomb Phase and Higgs Transition: Frustrated Transverse Interactions of Nd 2 Zr 2 O 7 journal, March 2020

Direct determination of the spin structure of Nd 2 Ir 2 O 7 by means of neutron diffraction journal, October 2016

Effective hyperfine temperature in frustrated Gd 2Sn 2O 7: two level model and 155Gd Mössbauer measurements journal, June 2002

PyCrystalField : software for calculation, analysis and fitting of crystal electric field Hamiltonians journal, February 2021

Title: Beyond magnons in Nd₂ScNbO₇: An Ising pyrochlore antiferromagnet with all-in–all-out order and random fields

Randomness-Induced Quantum Spin Liquid Behavior in the $s = 1 / 2$ Random-Bond Heisenberg Antiferromagnet on the Pyrochlore Lattice
journal, August 2019

Matrix Elements and Operator Equivalents Connected with the Magnetic Properties of Rare Earth Ions
journal, March 1952

Spin Dynamics and Unconventional Coulomb Phase in ${Nd}_{2} {Zr}_{2} O_{7}$
journal, June 2021

Quantum spin fluctuations in the dipolar Heisenberg-like rare earth pyrochlores
journal, May 2004

Thermodynamic properties of a spin-1/2 spin-liquid state in a κ-type organic salt
journal, April 2008

Hyperfine structure in the configurations4f 4 6s 2 and4f 4 5d 6s of Nd I
journal, March 1992

Observation of long-range magnetic ordering in pyrohafnate ${Nd}_{2} {Hf}_{2} O_{7}$ : A neutron diffraction study
journal, November 2015

Evolution of antiferromagnetic domains in the all-in-all-out ordered pyrochlore ${Nd}_{2} {Zr}_{2} O_{7}$
journal, May 2017

Low-temperature excitations in spin glasses: evidence for a T ^3/2 behaviour
journal, January 1981

Quantum spin liquids: a review
journal, November 2016

Role of the electrostatic model in calculating rare-earth crystal-field parameters
journal, July 1998

Sample independence of magnetoelastic excitations in the rare-earth pyrochlore ${Tb}_{2} {Ti}_{2} O_{7}$
journal, April 2016

Direct Observation of a Nuclear Spin Excitation in ${Ho}_{2} {Ti}_{2} O_{7}$
journal, January 2009

Emergent order in the kagome Ising magnet Dy3Mg2Sb3O14
journal, December 2016

Recent advances in magnetic structure determination by neutron powder diffraction
journal, October 1993

Pyrochlore Antiferromagnet: A Three-Dimensional Quantum Spin Liquid
journal, March 1998

Observation of magnetic fragmentation in spin ice
journal, April 2016

Point-Charge Calculations of Energy Levels of Magnetic Ions in Crystalline Electric Fields
book, January 1964

Field-induced quantum spin- $\frac{1}{2}$ chains and disorder in ${Nd}_{2} {Zr}_{2} O_{7}$
journal, August 2018

Magnetic structure and crystal-field states of the pyrochlore antiferromagnet ${Nd}_{2} {Zr}_{2} O_{7}$
journal, December 2015

Structural and magnetic investigations of single-crystalline neodymium zirconate pyrochlore ${Nd}_{2} {Zr}_{2} O_{7}$
journal, May 2015

Hyperfine Interactions in Rare‐Earth Metals
journal, April 1963

Nature of the randomness-induced quantum spin liquids in two dimensions
journal, September 2019

Low-energy nuclear spin excitations in ${NdMg}_{3}$ and ${NdCo}_{2}$
journal, July 2008

Effective spin- $\frac{1}{2}$ scalar chiral order on kagome lattices in ${Nd}_{3} {Sb}_{3} {Mg}_{2} O_{14}$
journal, May 2016

Fragmented monopole crystal, dimer entropy, and Coulomb interactions in ${Dy}_{2} {Ir}_{2} O_{7}$
journal, September 2020

Fluctuations and All-In–All-Out Ordering in Dipole-Octupole ${Nd}_{2} {Zr}_{2} O_{7}$
journal, November 2015

Homogeneous reduced moment in a gapful scalar chiral kagome antiferromagnet
journal, July 2019

Synthesis and structure of new pyrochlore-type oxides Ln2ScNbO7 (Ln=Pr, Nd, Eu, Gd, Dy)
journal, August 2008

Low-temperature specific heat and possible gap to magnetic excitations in the Heisenberg pyrochlore antiferromagnet ${Gd}_{2} {Sn}_{2} O_{7}$
journal, August 2007

Linear spin wave theory for single-Q incommensurate magnetic structures
journal, March 2015

A quantum liquid of magnetic octupoles on the pyrochlore lattice
journal, March 2020

Evidence for Gapped Spin-Wave Excitations in the Frustrated ${Gd}_{2} {Sn}_{2} O_{7}$ Pyrochlore Antiferromagnet from Low-Temperature Specific Heat Measurements
journal, August 2007

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

Fragmentation in spin ice from magnetic charge injection
journal, August 2017

The pyrochlore Ho2Ti2O7: Synthesis, crystal growth, and stoichiometry
journal, October 2018

Quantum Spin Ice Dynamics in the Dipole-Octupole Pyrochlore Magnet ${Ce}_{2} {Zr}_{2} O_{7}$
journal, May 2019

Magnetic Order with Fractionalized Excitations in Pyrochlore Magnets with Strong Spin-Orbit Coupling
journal, July 2019

A time-of-flight backscattering spectrometer at the Spallation Neutron Source, BASIS
journal, August 2011

Crystal field levels and magnetic anisotropy in the kagome compounds ${Nd}_{3} {Sb}_{3} {Mg}_{2} O_{14}$ , ${Nd}_{3} {Sb}_{3} {Zn}_{2} O_{14}$ , and $\Pr_{3} {Sb}_{3} {Mg}_{2} O_{14}$
journal, October 2018

SciPy 1.0: fundamental algorithms for scientific computing in Python
journal, February 2020

Massive electron state in YbBiPt
journal, December 1991

Coulombic Quantum Liquids in Spin- $1 / 2$ Pyrochlores
journal, January 2012

Proximate Kitaev quantum spin liquid behaviour in a honeycomb magnet
journal, April 2016

Spin dynamics of the ordered dipolar-octupolar pseudospin- $\frac{1}{2}$ pyrochlore ${Nd}_{2} {Zr}_{2} O_{7}$ probed by muon spin relaxation
journal, August 2016

Spin liquids in frustrated magnets
journal, March 2010

Disorder-Induced Quantum Spin Liquid in Spin Ice Pyrochlores
journal, February 2017

Quantum spin liquids
journal, January 2020

Anisotropic exchange Hamiltonian, magnetic phase diagram, and domain inversion of ${Nd}_{2} {Zr}_{2} O_{7}$
journal, April 2019

Bestimmung des inneren Magnetfeldes in V2O3 mit Hilfe der inelastischen Spin-Flip-Streuung von Neutronen
journal, June 1970

Pyrochlore photons: The $U (1)$ spin liquid in a $S = \frac{1}{2}$ three-dimensional frustrated magnet
journal, February 2004

${Nd}_{2} {Sn}_{2} O_{7}$ : An all-in–all-out pyrochlore magnet with no divergence-free field and anomalously slow paramagnetic spin dynamics
journal, October 2015

Measurement of the spin-excitation continuum in one-dimensional ${KCuF}_{3}$ using neutron scattering
journal, November 1995

Fragmentation in Frustrated Magnets: A Review
journal, September 2020

Competing orders in pyrochlore magnets from a $Z_{2}$ spin liquid perspective
journal, August 2019

Unbound spinons in the S =1/2 antiferromagnetic chain ${KCuF}_{3}$
journal, June 1993

The high-flux backscattering spectrometer at the NIST Center for Neutron Research
journal, May 2003

Quantum Spin Ices and Topological Phases from Dipolar-Octupolar Doublets on the Pyrochlore Lattice
journal, April 2014

Magnetism of neodymium trifluoromethanesulfonate nonahydrate and effects of the crystal field
journal, June 1999

Magnetic-Moment Fragmentation and Monopole Crystallization
journal, January 2014

Critical phenomena and renormalization-group theory
journal, October 2002

Heat-capacity measurements on rare-earth double oxides R2M2O7
journal, September 1969

Thermal transport for probing quantum materials
journal, May 2020

Specific heat of NM-TM spin glasses
journal, March 1989

Quantum Versus Classical Spin Fragmentation in Dipolar Kagome Ice ${Ho}_{3} {Mg}_{2} {Sb}_{3} O_{14}$
journal, September 2020

Impact of stoichiometry of ${Yb}_{2} {Ti}_{2} O_{7}$ on its physical properties
journal, March 2017

A new protocol for the determination of magnetic structures using simulated annealing and representational analysis (SARAh)
journal, March 2000

A Field Guide to Spin Liquids
journal, March 2019

Experimental signatures of a three-dimensional quantum spin liquid in effective spin-1/2 Ce2Zr2O7 pyrochlore
journal, July 2019

Quantum spin ice: a search for gapless quantum spin liquids in pyrochlore magnets
journal, May 2014

Quantum spin liquid at finite temperature: Proximate dynamics and persistent typicality
journal, July 2019

Spin glasses: Experimental facts, theoretical concepts, and open questions
journal, October 1986

Quantum origins of moment fragmentation in ${Nd}_{2} {Zr}_{2} O_{7}$
journal, September 2016

Order out of a Coulomb Phase and Higgs Transition: Frustrated Transverse Interactions of ${Nd}_{2} {Zr}_{2} O_{7}$
journal, March 2020

Direct determination of the spin structure of ${Nd}_{2} {Ir}_{2} O_{7}$ by means of neutron diffraction
journal, October 2016

Effective hyperfine temperature in frustrated Gd 2Sn 2O 7: two level model and 155Gd Mössbauer measurements
journal, June 2002

PyCrystalField : software for calculation, analysis and fitting of crystal electric field Hamiltonians
journal, February 2021

Evidence for dynamic kagome ice
journal, September 2018

Frustrated Quantum Rare-Earth Pyrochlores
journal, March 2019