TY - JOUR
T1 - Birchite Cd2Cu2(PO4)2SO4·5 H2 O as a model antiferromagnetic spin-1/2 Heisenberg J1-J2 chain
AU - Fujihala, Masayoshi
AU - Jeschke, Harald O.
AU - Morita, Katsuhiro
AU - Kuwai, Tomohiko
AU - Koda, Akihiro
AU - Okabe, Hirotaka
AU - Matsuo, Akira
AU - Kindo, Koichi
AU - Mitsuda, Setsuo
N1 - Funding Information:
The experiment was performed at the MLF of J-PARC under a user program (Proposal No. 2020A0066). This study is supported by the Grant-in-Aid for Scientific Research (Grants No. 21K03453 and No. 17K1434) from MEXT, Japan.
Publisher Copyright:
© 2022 American Physical Society.
PY - 2022/11
Y1 - 2022/11
N2 - S=1/2 Heisenberg J1-J2 chain antiferromagnets have been investigated extensively due to their exotic magnetic states. Here, we report the magnetic behavior of birchite Cd2Cu2(PO4)2SO4·5H2O and its effective spin model. Experimental studies by magnetic susceptibility, magnetization, heat capacity, and μSR measurements indicate the absence of long-range order down to 0.4 K. Theoretical studies reveal that birchite is a model compound for the J1-J2 antiferromagnetic chain: the intrachain interactions J1 and J2 are antiferromagnetic and their magnitude is about 100 times larger than the interchain interactions. The magnitude of J2 is two to three times larger than that of J1, thus the spin gap is expected to be only a few percent of that of J1. The temperature dependence of the specific heat shows a broad peak at about 1 K (≃0.036J1), which suggests the presence of a spin gap.
AB - S=1/2 Heisenberg J1-J2 chain antiferromagnets have been investigated extensively due to their exotic magnetic states. Here, we report the magnetic behavior of birchite Cd2Cu2(PO4)2SO4·5H2O and its effective spin model. Experimental studies by magnetic susceptibility, magnetization, heat capacity, and μSR measurements indicate the absence of long-range order down to 0.4 K. Theoretical studies reveal that birchite is a model compound for the J1-J2 antiferromagnetic chain: the intrachain interactions J1 and J2 are antiferromagnetic and their magnitude is about 100 times larger than the interchain interactions. The magnitude of J2 is two to three times larger than that of J1, thus the spin gap is expected to be only a few percent of that of J1. The temperature dependence of the specific heat shows a broad peak at about 1 K (≃0.036J1), which suggests the presence of a spin gap.
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U2 - 10.1103/PhysRevMaterials.6.114408
DO - 10.1103/PhysRevMaterials.6.114408
M3 - Article
AN - SCOPUS:85143675395
SN - 2475-9953
VL - 6
JO - Physical Review Materials
JF - Physical Review Materials
IS - 11
M1 - 114408
ER -