Journal ArticleDOI
Absence of Magnetic Dipolar Phase Transition and Evolution of Low-Energy Excitations in PrNb 2 Al 20 with Crystal Electric Field Γ 3 Ground State: Evidence from 93 Nb-NQR Studies
Tetsuro Kubo,Hisashi Kotegawa,Hideki Tou,Ryuji Higashinaka,Akihiro Nakama,Yuji Aoki,Hideyuki Sato +6 more
TLDR
In this article, the bulk magnetic susceptibility and 93Nb nuclear quadrupole resonance (NQR) in the Pr-based caged compound PrNb2Al20 were analyzed and the results showed that no symmetry-breaking magnetic dipole order occurs down to 75 mK. The frequency dependence of 1/T1 is attributed to the magnetic fluctuation due to the hyperfineenhanced 141Pr nuclear moment inherent in the nonmagnetic Γ3 CEF ground state.Abstract:
We report measurements of bulk magnetic susceptibility and 93Nb nuclear quadrupole resonance (NQR) in the Pr-based caged compound PrNb2Al20. By analyzing the magnetic susceptibility and magnetization, the crystal electric field (CEF) level scheme of PrNb2Al20 is determined to be Γ3(0 K)–Γ4(21.32 K)–Γ5(43.98 K)–Γ1(51.16 K) within the framework of the localized 4f electron picture. The 93Nb-NQR spectra exhibit neither spectral broadening nor spectral shift upon cooling down to 75 mK. The 93Nb-NQR spin–lattice relaxation rate 1/T1 at 5 K depends on the frequency and remains almost constant below 5 K. The frequency dependence of 1/T1 is attributed to the magnetic fluctuation due to the hyperfine-enhanced 141Pr nuclear moment inherent in the nonmagnetic Γ3 CEF ground state. The present NQR results provide evidence that no symmetry-breaking magnetic dipole order occurs down to 75 mK. Also, considering an invariant form of the quadrupole and octupole couplings between a 93Nb nucleus and Pr 4f electrons, Pr 4f qu...read more
Citations
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Classification of atomic-scale multipoles under crystallographic point groups and application to linear response tensors
TL;DR: In this article, the authors theoretically construct a general formalism of multipole description by considering four independent types of multipoles: electric, magnetic, electric toroidal and magnetic toroidal.
Journal ArticleDOI
Exotic Quadrupolar Phenomena in Non-Kramers Doublet Systems — The Cases of PrT2Zn20 (T = Ir, Rh) and PrT2Al20 (T = V, Ti) —
TL;DR: In this paper, the experimental evidence and related theoretical background on exotic phenomena arising from local quadrupolar degrees of freedom were reviewed and compared on four prototype compounds of PrT2X20 (T = Ir, Rh, X = Zn; T = V, Ti, Al).
Journal ArticleDOI
Cubic hastatic order in the two-channel Kondo-Heisenberg model
TL;DR: In this paper, the authors provide a survey of cubic hastatic order using the simple two-channel Kondo-Heisenberg model, and employ an SU(N) fermionic mean field treatment on square and simple cubic lattices, and examine how the nature and stability of Hastatic order varies as we vary the Heisenberg coupling, conduction electron density, band degeneracies, and apply both channel and spin symmetry breaking fields.
Journal ArticleDOI
Magnetic and thermal properties of NdT2AI20 (T: Ti, V, Cr) single crystals
Takahiro Namiki,Kenta Nosaka,Kyousuke Tsuchida,Qiankun Lei,Ryousuke Kanamori,Katsuhiko Nishimura +5 more
TL;DR: In this paper, the Al-self flux method was used to grow the caged cubic compounds NdT2Al20 (T: Ti, V, Cr) by the Al self flux method, and measured magnetic susceptibility χ, magnetization M, and specific heat divided by temperature C/T down to 0.5K.
Journal ArticleDOI
Antiferroquadrupolar Ordering in Quadrupolar Kondo Lattice of Non-Kramers System PrTa2Al20
TL;DR: In this article, single crystals of PrTa2Al20 have been investigated by means of single-crystal structural analysis and measurements of magnetization, specific heat, and electrical resistivity.
References
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