Frustrated Kagome Antiferromagnets under High Magnetic Fields

Yoshida, Hiroyuki

doi:10.7566/jpsj.91.101003

Cited by 7 publications

(2 citation statements)

References 143 publications

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“…Several model compounds exist for S = 1/2 kagome antiferromagnets [24][25][26][27][28][29][30][31][32][33][34][35][36]. In the model compounds, the next-nearest-neighbor exchange interaction J 2 always exists regardless of whether it is large or small.…”

Section: Introductionmentioning

confidence: 99%

Resonating dimer–monomer liquid state in a magnetization plateau of a spin-$$\frac{1}{2}$$ kagome-strip Heisenberg chain

2021

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Highly frustrated spin systems such as the kagome lattice are a treasure trove of new quantum states with large entanglements. Herein, we study the spin-$$\frac{1}{2}$$ 1 2 Heisenberg model on a kagome-strip chain, which is a one-dimensional kagome lattice, using the density matrix renormalization group method. Calculating the central charge and entanglement spectrum for the kagome-strip chain, we find a gapless spin liquid state with doubly degenerate entanglement spectra in a 1/5 magnetization plateau. We also obtain a gapless low-lying continuum in the dynamic spin structure calculated using the dynamical density matrix renormalization group method. We then propose a resonating dimer–monomer liquid state that meets these features.

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Section: Introductionmentioning

confidence: 99%

Resonating dimer–monomer liquid state in a magnetization plateau of a spin-$$\frac{1}{2}$$ kagome-strip Heisenberg chain

2021

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“…1) Practically all aspects of its magnetic properties are under debate: (a) the precise nature of the spin-liquid ground state, [2][3][4][5][6][7][8][9] (b) the magnetic and caloric properties at non-zero temperature, [10][11][12][13][14][15][16][17][18][19][20][21][22][23][24] and (c) the magnetization process of the spin-1 /2 KHAF. [25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41][42] In the present paper we discuss the temperature dependence of the magnetization curve of the KHAF for large system sizes. At T = 0 and in the thermodynamic limit the magnetization curve consists of a series of magnetization plateaus at 3 /9 = 1 /3, 5 /9 and 7 /9 (and possibly 33) at 1 /9) of the saturation magnetization, 24,33,34) among which the plateau at 1 /3 is the widest.…”

Section: Introductionmentioning

confidence: 99%

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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An ultracompact scanning tunneling microscope within a Φ 10 piezo tube in a 20 T superconducting magnet

Zhang,

Wang,

Meng

et al. 2024

Review of Scientific Instruments

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Low-temperature scanning tunneling microscopy and spectroscopy (STM/S) help to better understand the fundamental physics of condensed matter. We present an ultracompact STM within a Φ 10 piezo tube in a 20 T superconducting magnet. The carefully cut piezo tube contains the STM’s coarse-positioning assembly. Loading an STM tip–sample mechanical loop into the piezo tube with special cut openings enables an ultracompact pencil-size dimension down to Φ 10 mm, in which fine-machined nonmagnetic parts are assembled to enable slide–stick motion and xyz-scanning procedures. The small size leads to a higher resonant frequency, a typical feature of a rigid STM instrument, increasing its vibration immunity. Scanning by moving the sample while keeping the tip stationary improves the stability of the tip–sample junction compared to moving the tip. Taking advantage of its high-field compatibility and rigid design, our STM captures the atomically resolved topography of highly oriented pyrolytic graphite (HOPG) at 1.5 K and in magnetic fields up to 17 T. The topography of graphene lattice and graphite is simultaneously recorded on an atomic terrace of HOPG, unveiling a modified local charge density at a surface defect. The superconducting energy gaps of layered type-II superconductors NbSe2 and PdBi2 are well resolved through dI/dV tunneling spectra at sub-2 K. Our unique STM is highly suitable for potential STM/S applications in world-class high-field facilities where the strong magnetic field can exceed 30 T.

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Frustrated Kagome Antiferromagnets under High Magnetic Fields

Cited by 7 publications

References 143 publications

Resonating dimer–monomer liquid state in a magnetization plateau of a spin-$$\frac{1}{2}$$ kagome-strip Heisenberg chain

Resonating dimer–monomer liquid state in a magnetization plateau of a spin-$$\frac{1}{2}$$ kagome-strip Heisenberg chain

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

An ultracompact scanning tunneling microscope within a Φ 10 piezo tube in a 20 T superconducting magnet

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