Investigation of spin liquid state near the quantum critical point by high-pressure measurements of quantum kagome lattice antiferromagnets

对Dzyaloshinski-Moriya （DM）交互（反对称交换交互）的自旋液体状态稳定性的调查，量子卡组抗磁ZnCu_3（OH）_6Cl_2 （Herbertsmithite）和Cu_3V_2O_7（OH）_2H_2O（Volborthite）在低温下表现得很高。在这些系统中，量子从自旋液体状态转换到尼尔状态，在低温下降到1.8 K时无法观察到高压上升到7.9千巴。在其他方面，DM在类似量子自旋Kagome的抗磁网Cu_2O（SO_4） （Dolerophanite）、经典自旋Kagome晶格抗磁网KCr_3（SO_4）_2（OH_6） （Cr-Jarosite）和自旋液体地面状态蜂窝晶格抗磁网Bi_3Mn_4O_12（NO_3）估计使用高频ESR测量。

To investigate spin-liquid state stability for Dzyaloshinski-Moriya (DM) interaction (antisymmetric exchange interaction), magnetic susceptibility measurements of quantum kagome antiferromagnets ZnCu_3(OH)_6Cl_2 (Herbertsmithite) and Cu_3V_2O_7(OH)_2・2H_2O (Volborthite) have been performed under high-pressure at low temperature. Quantum transition from spin-liquid state to Neel state in these systems cannot observed in high-pressure up to 7.9 kbar at low temperature down to 1.8 K. On the other hand, D terms of DM interaction in quantum-spin kagome like antiferromagnet Cu_2O(SO_4) (Dolerophanite), classical-spin kagome lattice antiferromagnet KCr_3(SO_4)_2(OH_6) (Cr-jarosite) and spin-liquid ground state honeycomb lattice antiferromagnet Bi_3Mn_4O_12(NO_3) have been estimated using high-frequency ESR measurements.