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Microscopic phase separation in triangular-lattice quantum spin magnet kappa-(BEDT-TTF)2Cu2(CN)3 probed by muon spin relaxation
Saori Nakajima, Takao Suzuki, Yasuyuki Ishii +8
The ground state of the quantum spin system kappa-(BEDT-TTF)2Cu2(CN)3 in which antiferromagnetically-interacting S=1/2 spins are located on a nearly equilateral triangular lattice…
\muSR-dtected Soft mode toward a Possible Phase Transition in disordered spin gap system (CH3)2CHNH3-Cu(ClxBr1-x)3
T. Goto, T. Suzuki, I. Watanabe +4
Measurements of macroscopic properties have indicated that the bond-disordered spin-gap system (CH3)2CHNH3-Cu(ClxBr1-x)3 is gapless when x is between 0.44 and 0.87. Using muon spin…
μSR-detection of the soft-mode toward the exotic magnetic ground state in bond-disordered quantum spin system IPA-Cu(ClBr)
Takayuki Goto, Takao Suzuki, Keishi Kanada +4
The spin-gap system with a bond-disorder (CH3)2CHNH3-Cu(ClxBr1-x)3 is reported by experiments on macroscopic quantities of the uniform susceptibility and the specific heat to show…
Magnetic field-induced one-magnon Raman scattering in the magnon Bose-Einstein condensation phase of TlCuCl
Haruhiko Kuroe, Kouhei Kusakabe, Akira Oosawa +4
We report the observation of the -symmetric one-magnon Raman peak in the magnon Bose-Einstein condensation phase of TlCuCl. Its Raman shift traces the one-magnon e…
NMR study on the local structure in La-based high-Tc cuprates
T. Goto, J. Tonishi, T. Suzuki +5
To date, there has been no evidence for the macroscopic structural phase transition to the low temperature tetragonal structure (LTT) with a space group P42/ncm in high-TC cuprate…
H-NMR Study of the Random Bond Effect in the Quantum Spin System (CH)CHNHCu(ClBr)
T. Adachi, K. Kanada, T. Saito +2
Spin-lattice relaxation rate of H-NMR has been measured in (CH)CHNHCu(ClBr) with , which has been reported to be gapped system wi…
NMR Study on the Vortex Slush Phase in Organic Superconductor κ-(BEDT-TTF)2Cu(NCS)2
M. Urano, J. Tonishi, H. Inoue +10
The vortex state in a single crystal of the layered organic superconductor κ-(BEDT-TTF2Cu(NCS)2, where BEDT-TTF (or ET) is bis(ethylenedithio)tetrathiafulvalene, was studied by 1H-…
The effect of randomness on the quantum spin system TlKCuCl with ${\boldmath $x$}$ = 0.44 studied by the Zero-field Muon-Spin-Relaxation (ZF-SR) method
Takao Suzuki, Fumiko Yamada, Isao Watanabe +3
Zero-field muon-spin-relaxation (ZF-{\boldmath }SR) measurements were carried out down to 80 mK on the randomness bond system TlKCuCl with = 0.44. Time spect…
1H-NMR Study on the Magnetic Order in the Mixture of Two Spin Gap Systems (CH3)2CHNH3CuCl3 and (CH3)2CHNH3CuBr3
Keishi Kanada, Takehiro Saito, Akira Oosawa +2
The antiferromagnetic ordering in the solid-solution of the two spin-gap systems (CH3)2CHNH3CuCl3 and (CH3)2CHNH3CuBr3 has been investigated by 1H-NMR. The sample with the Cl-conte…
Softening of Magnetic Excitations Leading to Pressure-Induced Quantum Phase Transition in Gapped Spin System KCuCl
K. Goto, T. Osakabe, K. Kakurai +4
KCuCl is a three dimensionally coupled spin dimer system, which undergoes a pressure-induced quantum phase transition from a gapped ground state to an antiferromagnetic state a…
Thermodynamic properties of the field-induced Neel order of TlCuCl3
S. Stark, O. Heyer, A. Vasiliev +3
TlCuCl3 shows a quantum phase transition from a spin-gap phase to a Neel-ordered ground state as a function of magnetic field around H_{C0}~4.8T. From measurements of the specific…
Cu-NMR study on the disordered quantum spin magnet with the Bose-glass ground state
T. Fujiwara, H. Inoue, A. Oosawa +9
Cu-NMR study has been performed on the disordered spin-gap system Tl1-xKxCuCl3 In the high-field H > HC=Δ/μ_B, where Δis the spin-gap, the hyperfine field becomes extremely inhomog…
Thermodynamics of the coupled spin-dimer system TlCuCl3 close to a quantum phase transition
T. Lorenz, S. Stark, O. Heyer +4
We present thermal expansion alpha, magnetostriction and specific heat C measurements of \tal, which shows a quantum phase transition from a spin-gap phase to a Neel-ordered ground…
Polarized Neutron Inelastic Scattering Study of the Anisotropic Magnetic Fluctuations in the Quasi-1D Ising-like Antiferromagnet TlCoCl
A. Oosawa, K. Kakurai, Y. Nishiwaki +1
Polarized neutron inelastic scattering experiments have been carried out in the quasi-1D Ising-like antiferromagnet TlCoCl. We observed the longitudinal magnetic fluctuation $S…
Muon spin relaxation and rotation study on the solid solution of the two spin-gap systems (CH3)2CHNH3-CuCl3 and (CH3)2CHNH3-CuBr3
T. Saito, A. Oosawa, T. Goto +2
Muon-spin-rotation and relaxation studies have been performed on (CH)CHNHCu(ClBr) with =0.85 and 0.95, which are solid solutions of the two isomorphi…
Uniaxial pressure dependencies of the phase boundary of TlCuCl_3
N. Johannsen, A. Oosawa, H. Tanaka +2
We present a thermal expansion and magnetostriction study of TlCuCl_3, which shows a magnetic-field induced transition from a spin gap phase to a Neel ordered phase. Using Ehrenfes…
Magnetoelastic Coupling in the Spin-Dimer System TlCuCl
N. Johannsen, A. Vasiliev, A. Oosawa +2
We present high-resolution measurements of the thermal expansion and the magnetostriction of TlCuCl which shows field-induced antiferromagnetic order. We find pronounced anom…
Dynamics of anisotropic spin dimer system in strong magnetic field
A. K. Kolezhuk, V. N. Glazkov, H. Tanaka +1
Recently measured high-field ESR spectra of the spin dimer material TlCuCl3 are described within the framework of an effective field theory. A good agreement between the theory and…
Pressure-Induced Successive Magnetic Phase Transitions in the Spin Gap System TlCuCl
A. Oosawa, K. Kakurai, T. Osakabe +3
Under the hydrostatic pressure GPa, polarized neutron elastic scattering experiments have been carried out on the coupled spin dimer system TlCuCl with the gapped grou…
Magnetization plateaux of S = 1/2 two-dimensional frustrated antiferromagnet CsCuBr
T. Ono, H. Tanaka, O. Kolomiyets +9
The field induced magnetic phase transitions of CsCuBr were investigated by means of magnetization process and neutron scattering experiments. This system undergoes magneti…
Spin-resonance modes of the spin-gap magnet TlCuCl_3
V. N. Glazkov, A. I. Smirnov, H. Tanaka +1
Three kinds of magnetic resonance signals were detected in crystals of the spin-gap magnet TlCuCl_3. First, we have observed the microwave absorption due to the excitation of the t…
Sound attenuation on the Bose-Einstein condensation of magnons in TlCuCl_3
E. Ya. Sherman, P. Lemmens, B. Busse +2
We investigated experimentally and theoretically sound attenuation in the quantum spin system TlCuCl_3 in magnetic fields at low temperatures. Near the point of Bose-Einstein conde…
Field-Induced Magnetic Order and Simultaneous Lattice Deformation in TlCuCl3
O. Vyaselev, M. Takigawa, A. Vasiliev +2
We report the results of Cu and Cl nuclear magnetic resonance experiments (NMR) and thermal expansion measurements in magnetic fields in the coupled dimer spin system TlCuCl3. We f…
Neutron Scattering Study of Magnetic Ordering and Excitations in the Doped Spin Gap System Tl(CuMg)Cl
A. Oosawa, M. Fujisawa, K. Kakurai +1
Neutron elastic and inelastic scattering measurements have been performed in order to investigate the spin structure and the magnetic excitations in the impurity-induced antiferrom…