Dielectric anomaly in the quasi-one-dimensional frustrated spin-12system Rb2(Cu1−

Abstract

Dielectric and magnetic properties have been studied for poly-crystalline samples of quasi-one-dimensional frustrated spin-1/2 system Rb 2 (Cu 1-x M x ) 2 Mo 3 O 12 (M=Ni and Zn) which does not exhibit a three-dimensional magnetic transition due to quantum spin fluctuation and low dimensionality. A broad peak in the magnetic susceptibility -temperature curves originated from a short range helical ordering at low temperature is suppressed by the Ni and Zn substitution for Cu sites. The capacitance is found to anomalously increase with decreasing T below ~50 K, which is also suppressed by the impurity doping. The behavior of the anomalous capacitance component is found to be strongly connected with that of the

Critical dielectric susceptibility at a magnetic BEC quantum critical point

“…We conclude that the T anomaly reported in Refs. [29][30][31][32] must be due to an impurity phase. The most likely culprit is a related copper molybdate, namely Cu 3 Mo 2 O 9 .…”

“…The peculiar magnetic and dielectric properties of the quasi-one-dimensional frustrated ferro-antiferromagnet Rb 2 Cu 2 Mo 3 O 12 have been studied for over a decade [25][26][27][28][29][30][31][32]. The ground state is a gapped quantum paramagnet, arXiv:2011.00107v1 [cond-mat.str-el] 30 Oct 2020 with magnetic long-range order induced in a magnon BEC transition at µ 0 H c1 ∼ 2 T. The BEC "dome" extends up to µ 0 H c2 ∼ 13 T, where the system becomes saturated.…”

“…The ground state is a gapped quantum paramagnet, arXiv:2011.00107v1 [cond-mat.str-el] 30 Oct 2020 with magnetic long-range order induced in a magnon BEC transition at µ 0 H c1 ∼ 2 T. The BEC "dome" extends up to µ 0 H c2 ∼ 13 T, where the system becomes saturated. Magnetic long-range order is in all fields confined to T < 1.5 K. The material generated a great deal of excitement when it was found to exhibit magnetic-field induced ferroelectricity at much higher temperatures, already at T = 8 K [29][30][31][32]. It was suggested that below T the system is a chiral spin liquid, with no magnetic long-range order but with spontaneously chiral spin fluctuations [33].…”

“…CuO 4 plaquettes form a one-dimensional chain along the crystallographic b axis. Powder samples have been extensively investigated by means of magnetic and dielectric measurements [25][26][27][28][29][30][31][32], high pressure studies [35,36], NMR [37,38], neutron scattering [31,32,39], muon spin relaxation measurements [31,40], and electron spin resonance [28,32]. The ground state is a nonmagnetic singlet with a spin gap ∆ ∼ 2 K, and the spins become fully polarized at µ 0 H ∼ 13 T [27,28].…”

Quantum Otto heat engine based on a multiferroic chain working substance

“…Electric field coupling resembles the Dzyaloshinskii-Moriya (DM) anisotropy, with the constant = ℘ d g ME . The effective model Hamiltonian (2) , see [45]. The problem of electric-field control of the magnetic chirality of a ferroaxial MF system was addressed in a recent paper [36].…”