Nonmonotonic field dependence of the Néel temperature in the quasi-two-dimensional magnet<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mrow><mml:mo>[</mml:mo><mml:mrow><mml:mtext>Cu</mml:mtext><mml:mrow><mml:mo>(</mml:mo><mml:mrow><mml:msub><mml:mrow><mml:mtext>HF</mml:mtext></mml:mrow><mml:mn>2</mml:mn></mml:msub></mml:mrow><mml:mo>)</mml:mo></mml:mrow><mml:msub><mml:mrow><mml:mrow><mml:mo>(</mml:mo><mml:mrow><mml:mtext>pyz</mml:mtext></mml:mrow><mml:mo>)</mml:mo

Sengupta, Pinaki; Batista, Cristian D.; McDonald, R. D.; Cox, Susan; Singleton, John; Huang, Lihua; Papageorgiou, Thomas; Ignatchik, O.; Herrmannsdörfer, T.; Manson, Jamie L.; Schlueter, John A.; Funk, Kylee A.; Wosnitza, J.

doi:10.1103/physrevb.79.060409

Cited by 59 publications

(55 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, the manner in which the susceptibility contours, and hence the notional L to H phase boundary, curve back towards the origin as the temperature is cooled below 10 K is suggestive of some more complex interplay. Related behavior has been seen in the phase diagrams of reduced-dimensionality antiferromagnets 44,45 ; but by contrast, in those cases, the effect occurred on the high−T , low−H side of the phase boundary and was attributed to the effect of thermal fluctuations on the free energy of the system 44 . In the case of CeOs 4 Sb 12 , the backwards curvature instead occurs in the vicinity of the low-temperature antiferromagnetic state [orange phase boundary in Fig.…”

Section: Delineating the L To H Phase Boundary In Ceos4sb12mentioning

confidence: 94%

Fermi-surface topologies and low-temperature phases of the filled skutterudite compoundsCeOs4Sb12andNdOs4Sb12

Singleton

Goddard

et al. 2016

Phys. Rev. B

View full text Add to dashboard Cite

MHz conductivity, torque magnetometer and magnetization measurements are reported on single crystals of CeOs4Sb12 and NdOs4Sb12 using temperatures down to 0.5 K and magnetic fields of up to 60 tesla. The field-orientation dependence of the de Haas-van Alphen and Shubnikov-de Haas oscillations is deduced by rotating the samples about the [010] and [011] directions. The results indicate that NdOs4Sb12 has a similar Fermi surface topology to that of the unusual superconductor PrOs4Sb12, but with significantly smaller effective masses, supporting the importance of local phonon modes in contributing to the low-temperature heat capacity of NdOs4Sb12. By contrast, CeOs4Sb12 undergoes a field-induced transition from an unusual semimetal into a high-field, hightemperature state characterized by a single, almost spherical Fermi-surface section. The behavior of the phase boundary and comparisons with models of the bandstructure lead us to propose that the field-induced phase transition in CeOs4Sb12 is similar in origin to the well-known α − γ transition in Ce and its alloys.

show abstract

Section: Delineating the L To H Phase Boundary In Ceos4sb12mentioning

confidence: 94%

Fermi-surface topologies and low-temperature phases of the filled skutterudite compoundsCeOs4Sb12andNdOs4Sb12

Singleton

Goddard

et al. 2016

Phys. Rev. B

View full text Add to dashboard Cite

show abstract

“…It then has a dual effect on the spins by suppressing the amplitude of the order parameter by forcing spins along a particular direction and also reducing the phase space for phase fluctuations from a sphere to a circle. At low fields the magnetic ordering transition is controlled by phase fluctuations and at higher field by amplitude fluctuations leading to the non-monotonic phase boundary that is observed in experiment [41]. We have been able to measure the phase boundary in field using both LF µ + SR and transverse field (TF) µ + SR [35] as shown for [Cu(HF 2 )(pyz) 2 ]BF 4 in figure 5.…”

Section: Two Dimensionsmentioning

confidence: 75%

“…One experimental consequence of XY -like behaviour is that the phase boundary in applied magnetic field takes on a non-monotonic form as shown in figure 5 [41,35]. The application of the field makes it energetically favourable for the spins to tip into the XY plane, effectively reducing the dimensionality.…”

Section: Two Dimensionsmentioning

confidence: 99%

“…We have been able to measure the phase boundary in field using both LF µ + SR and transverse field (TF) µ + SR [35] as shown for [Cu(HF 2 )(pyz) 2 ]BF 4 in figure 5. It has been argued [41] that the energy scales for this physics are controlled by the Kosterlitz-Thouless physics described above. It is probable that the physics of vortices, along more complicated topological objects such as merons and skyrmions, will be an area of future interest in this field.…”

Section: Two Dimensionsmentioning

confidence: 99%

See 1 more Smart Citation

Another dimension: investigations of molecular magnetism using muon–spin relaxation

2013

View full text Add to dashboard Cite

Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-pro t purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details.

show abstract

“…This raises the question whether the 2D XY model is applicable to the anomalous state encountered in TK91 for H c1 rHrH c2 . Indeed, as pointed out by various authors 41,43 , a BKT transition and generic XY behaviour can be found also in an S ¼ 1/2 2D Heisenberg antiferromagnet by the application of a finite magnetic field along the z axis, which breaks the O(3) symmetry of the isotropic model. We stress that for dimerized systems such as TK91, which are gapped for HoH c1 , this scenario is applicable for H c1 oHoH c2 as the low-energy physics can be mapped on an effective easy-plane spin-1/2 XXZ model at a field H-H c1 (ref.…”

Section: Discussionmentioning

confidence: 99%

Evidence of a field-induced Berezinskii–Kosterlitz–Thouless scenario in a two-dimensional spin–dimer system

et al. 2014

View full text Add to dashboard Cite

Two-dimensional (2D) systems with continuous symmetry lack conventional long-range order because of thermal fluctuations. Instead, as pointed out by Berezinskii, Kosterlitz and Thouless (BKT), 2D systems may exhibit so-called topological order driven by the binding of vortex-antivortex pairs. Signatures of the BKT mechanism have been observed in thin films, specially designed heterostructures, layered magnets and trapped atomic gases. Here we report on an alternative approach for studying BKT physics by using a chemically constructed multilayer magnet. The novelty of this approach is to use molecular-based pairs of spin S ¼ ½ ions, which, by the application of a magnetic field, provide a gas of magnetic excitations. On the basis of measurements of the magnetic susceptibility and specific heat on a so-designed material, combined with density functional theory and quantum Monte Carlo calculations, we conclude that these excitations have a distinct 2D character, consistent with a BKT scenario, implying the emergence of vortices and antivortices.

show abstract

Nonmonotonic field dependence of the Néel temperature in the quasi-two-dimensional magnet[Cu(HF2)(pyz)

Cited by 59 publications

References 30 publications

Fermi-surface topologies and low-temperature phases of the filled skutterudite compoundsCeOs4Sb12andNdOs4Sb12

Fermi-surface topologies and low-temperature phases of the filled skutterudite compoundsCeOs4Sb12andNdOs4Sb12

Another dimension: investigations of molecular magnetism using muon–spin relaxation

Evidence of a field-induced Berezinskii–Kosterlitz–Thouless scenario in a two-dimensional spin–dimer system

Contact Info

Product

Resources

About