Piezomagnetic Properties in Altermagnetic MnTe

We examined the piezomagnetic effect in an antiferromagnet composed of MnTe, which is a candidate material for altermagnetism with a high critical temperature. We observed that the magnetization develops with the application of stress and revealed that the piezomagnetic coefficient Q is 1.38$\times10^{-8}$ ${\mu}$B/MPa at 300 K. The poling-field dependence of magnetization indicates that the antiferromagnetic domain can be controlled using the piezomagnetic effect. We demonstrate that the piezomagnetic effect is suitable for detecting and controlling the broken time reversal symmetry in altermagnets

Giant spin-driven ferroelectric polarization in TbMnO3 under high pressure.

The recent research on multiferroics has provided solid evidence that the breaking of inversion symmetry by spin order can induce ferroelectric polarization P. This type of multiferroics, called spin-driven ferroelectrics, often show a gigantic change in P on application of a magnetic field B. However, their polarization (~0.1 μC cm(-2)) is much smaller than that in conventional ferroelectrics (typically several to several tens of μC cm(-2)). Here we show that the application of external pressure to a representative spin-driven ferroelectric, TbMnO3, causes a flop of P and leads to the highest P (≈ 1.0 μC cm(-2)) among spin-driven ferroelectrics ever reported. We explain this behaviour in terms of a pressure-induced magnetoelectric phase transition, based on the results of density functional simulations. In the high-pressure phase, the application of B further enhances P over 1.8 μC cm(-2). This value is nearly an order of magnitude larger than those ever reported in spin-driven ferroelectrics

Dichotomy Between Orbital and Magnetic Nematic Instabilities in BaFe2S3

Nematic orders emerge nearly universally in iron-based superconductors, but elucidating their origins is challenging because of intimate couplings between orbital and magnetic fluctuations. The iron-based ladder material BaFe2S3, which superconducts under pressure, exhibits antiferromagnetic order below TN ~ 117K and a weak resistivity anomaly at T* ~ 180K, whose nature remains elusive. Here we report angle-resolved magnetoresistance (MR) and elastoresistance (ER) measurements in BaFe2S3, which reveal distinct changes at T*. We find that MR anisotropy and ER nematic response are both suppressed near T*, implying that an orbital order promoting isotropic electronic states is stabilized at T*. Such an isotropic state below T* competes with the antiferromagnetic order, which is evidenced by the nonmonotonic temperature dependence of nematic fluctuations. In contrast to the cooperative nematic orders in spin and orbital channels in iron pnictides, the present competing orders can provide a new platform to identify the separate roles of orbital and magnetic fluctuations.Comment: 7 pages 5 figures, to be published in Phys. Rev. Re

Folliculotropic mycosis fungoides treated with electron beam therapy that evolved into fatal, tumor-stage mycosis fungoides and erythroderma with multiple ulcerations

　A 71-year-old woman diagnosed with mycosis fungoides with multiple erythematous plaques and follicular papules on the scalp, trunk, and thigh was referred to our institution. Folliculotropic mycosis fungoides was histologically diagnosed, and the erythematous papules and plaques regressed temporarily after total-skin electron beam therapy. The patient then developed tumors and erythroderma. The area of painful erosion spread, and her condition rapidly worsened. The patient died 3 years and 4 months after the first examination due to multiple organ failure caused by sepsis. The cause of rapid evolution into erythroderma remains elusive and requires further investigation in similar cases

NinjaSat: Initial Operation Results of the First Japanese 6U CubeSat for Bright X-ray Sources

We report the initial operation results of the first Japanese 6U CubeSat X-ray observatory NinjaSat, which was launched into a sun-synchronous orbit at an altitude of 530 km on November 11, 2023, by the SpaceX Transporter-9 mission. NinjaSat is designed to observe bright X-ray sources in the sky, such as black holes and neutron stars, which are often difficult to observe with modern large X-ray satellites due to instrument limitations. After the payload verification, NinjaSat observed the Crab Nebula on February 9 and correctly detected the 33.8 ms pulsation from the neutron star. With this observation, NinjaSat met the minimum success criteria. NinjaSat observed 10 X-ray sources by June 20 and successfully demonstrated that many X- ray sources can be observed even with a CubeSat, which is limited in terms of resources available for science payloads. Specifically, NinjaSat conducted the follow-up observation of a newly discovered X-ray transient SRGA J144459.2−604207 two days after its discovery, detecting multiple type I X-ray bursts. NinjaSat also observed type II X-ray bursts from a rapid burster MXB 1730−335. To the best of our knowledge, these are the first observations of X-ray bursts with a CubeSat, enabled by the large effective area of NinjaSat. NinjaSat continues observations to achieve full success and extra success

ダイモウ ゲンパツ キョダイ GIST 1セツジョレイ

We report a case of giant gastrointestinal stromal tumor（GIST）primarily occurred in the greater omentum. A７８-year-old woman was referred to our hospital because of a giant abdominal tumor. Contrast-enhanced abdominal computed tomography（CT）showed a giant tumor measuring ２０×２４×１３cm in diameter in the abdominal cavity, consisting of heterogeneously enhanced solid and cystic lesions. Abdominal magnetic resonance imaging（MRI）after ３ weeks from the first medical examination showed the enlarged tumor measuring２４×２５×１７cm in diameter, the intensity of the solid lesion was low on T１weighted image, heterogeneously enhanced on T２weighted image and high on diffusion weighted image. At surgery, we confirmed the giant tumor continued to the omentum, and pressured the stomach, pancreas, and colon. The resected specimen weighed ８，３２５g containing of５，６４０ml of red-brown fluid. Histological examination showed the tumor consisted of proliferated spindle cells in a fascicular pattern and polynesic hemorrhage and necrosis. Immunohistochemically, the tumor cells were positive for c-kit and CD３４, and negative for S‐１００ protein and desmin, indicating a GIST in the greater omentum. The mitotic figures were in a４０／５０ high power field. In genetic testing, the tumor cells had exon１１mutation of c-kit gene. The woman started taking imatinib after operation and remains alive and recurrence-free