Phase Transitions in Spin-orbital Coupled Model for Pyroxene Titanium Oxides | Zendy

Takashi Hikihara | Zendy; Yukitoshi Motome | Zendy

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Phase Transitions in Spin-orbital Coupled Model for Pyroxene Titanium Oxides

Author(s) -

Takashi Hikihara,

Yukitoshi Motome

Publication year - 2005

Publication title -

journal of the physical society of japan

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.76

H-Index - 139

eISSN - 1347-4073

pISSN - 0031-9015

DOI - 10.1143/jpsjs.74s.212

Subject(s) - condensed matter physics , phase diagram , pyroxene , spin (aerodynamics) , physics , ground state , paramagnetism , phase transition , quantum phase transition , phase (matter) , materials science , quantum mechanics , chemistry , thermodynamics , mineralogy , olivine

We study the competing phases and the phase transition phenomena in aneffective spin-orbital coupled model derived for pyroxene titanium oxidesATiSi2O6 (A=Na, Li). Using the mean-field-type analysis and the numericalquantum transfer matrix method, we show that the model exhibits two differentordered states, the spin-dimer and orbital-ferro state and the spin-ferro andorbital-antiferro state. The transition between two phases is driven by therelative strength of the Hund's-rule coupling to the onsite Coulomb repulsionand/or by the external magnetic field. The ground-state phase diagram isdetermined. There is a keen competition between orbital and spin degrees offreedom in the multicritical regime, which causes large fluctuations andsignificantly affects finite-temperature properties in the paramagnetic phase.Comment: 4 pages, 6 figures, proceedings submitted to SPQS200

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