3 papers
cond-mat.str-el2020
Finite temperature thermodynamic properties of the spin-1 nematics in an applied magnetic field
Katsuhiro Tanaka, Chisa Hotta
We study numerically the thermodynamic properties of the spin nematic phases in a magnetic field in the spin-1 bilinear-biquadratic model. When the field is applied, the phase tran…
cond-mat.str-el2019
Abundant quadrupolar or nematic phases driven by the Heisenberg interactions in a spin-1 dimer system forming a bilayer
Katsuhiro Tanaka, Chisa Hotta
We explore several classes of quadrupolar ordering in a system of antiferromagnetically coupled quantum spin-1 dimers, which are stacked in the triangular lattice geometry forming…
cond-mat.str-el2018
Origin of Biquadratic Exchange Interactions in a Mott Insulator as a Driving Force of Spin Nematic Order
Katsuhiro Tanaka, Yuto Yokoyama, Chisa Hotta
We consider a series of Mott insulators in unit of two orbitals each hosting spin-1/2 electron, and by pairing two spin-1/2 into spin-1 triplet, derive the effective exchange inter…