Asymmetric melting of a one-third plateau in kagome quantum antiferromagnets

Misawa, Takahiro; Motoyama, Yuichi; Yamaji, Youhei

doi:10.1103/physrevb.102.094419

Cited by 10 publications

(11 citation statements)

References 46 publications

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“…A suggested explanation of this asymmetric phenomenon is that the density of states at low energies of the M 1/3subspace is far denser than that of the M 1/3 +1-subspace and that the density of states of the M 1/3 − 1-subspace must be even denser. 43,44) As discussed in recent articles 43,44) and shown later (a.u. );…”

Section: Asymmetric Melting Of the Kahf 1 /3-plateaumentioning

confidence: 89%

“…In Ref. 44, the possible influence of additional subspaces is acknowledged but not further investigated.…”

Section: Asymmetric Melting Of the Kahf 1 /3-plateaumentioning

confidence: 99%

“…Recent investigations on systems of size N = 27 and N = 36 confirm these findings and argue alongside. 44) Sakai and Nakano even speculate about a magnetization ramp in the thermodynamic limit. 45) Here we investigate the matter in depth for large systems sizes of up to N = 48 sites.…”

Section: Introductionmentioning

confidence: 99%

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Melting of magnetization plateaus for kagome and square-kagome lattice antiferromagnets

Schlüter¹,

Richter²,

Schnack³

2022

Preprint

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Unconventional features of the magnetization curve at zero temperature such as plateaus or jumps are a hallmark of frustrated spin systems. Very little is known about their behavior at non-zero temperatures. Here we investigate the temperature dependence of the magnetization curve of the kagomé lattice antiferromagnet in particular at 1 /3 of the saturation magnetization for large lattice sizes of up to N = 48 spins. We discuss the phenomenon of asymmetric melting and trace it back to a combined effect of unbalanced magnetization steps on either side of the investigated plateau as well as on the behavior of the density of states across the plateau. We compare our findings to the square-kagome lattice that behaves similarly at low temperatures at zero field, but as we will demonstrate differently at 1 /3 of the saturation magnetization. Both systems possess a flat one-magnon band and therefore share with the class of flat-band systems the general property that the plateau that precedes the jump to saturation melts asymmetrically but now with a minimal susceptibility that bends towards lower fields with increasing temperature.

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Section: Asymmetric Melting Of the Kahf 1 /3-plateaumentioning

confidence: 89%

“…In Ref. 44, the possible influence of additional subspaces is acknowledged but not further investigated.…”

Section: Asymmetric Melting Of the Kahf 1 /3-plateaumentioning

confidence: 99%

See 1 more Smart Citation

Melting of magnetization plateaus for kagome and square-kagome lattice antiferromagnets

Schlüter¹,

Richter²,

Schnack³

2022

Preprint

View full text Add to dashboard Cite

show abstract

“…For example, the number of spins we can treat is limited to about 24 in the case of an S = 1/2 quantum spin system. For overcoming such the situation, alternative numerical methods without ensemble average [1][2][3][4][5][6] have also been developed and used historically to investigate the thermal nature of the quantum frustrated spin systems, such as triangular [6][7][8][9], kagome [5][6][7][8][10][11][12][13][14][15][16][17], and pyrochlore [18][19][20] magnets. In particular, the method using a typical pure state has got attention recently because it has been proven in different and independent literatures that a single pure state can represent the thermal equilibrium in the thermodynamic limit [2,[4][5][6].…”

Section: Introductionmentioning

confidence: 99%

“…Excellent magnetic susceptibility [8,12] and specific-heat [13] measurements made at this time were used to estimate the coupling ratio as J/J D ' 0.635, thereby placing SrCu 2 (BO 3 ) 2 rather close to the dimer-plaquette QPT. Detailed experiments performed in the intervening two decades have revealed a spectacular series of magnetization plateaus [8,[14][15][16][17][18][19][20][21], as well as a curious redistribution of spectral weight at temperatures very low on the scale of the triplon gap [11,22]. Of most interest to our current study is the result [23] that an applied pressure makes it possible to increase the ratio J/J D to the extent that, at approximately 1.9 GPa, the material is pushed through the QPT into a plaquette phase.…”

Section: Introductionmentioning

confidence: 99%