Bose-Einstein condensation of triplons close to the quantum critical point in the quasi-one-dimensional spin-1/2 antiferromagnet NaVOPO_4

Mukharjee Prashanta Kumar; Ranjith K. M.; Koo B.; Sichelschmidt J.; Baenitz M.; Skourski Y.; Inagaki Y.; Furukawa Y.; Tsirlin A. A.; Nath R.

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Bose-Einstein condensation of triplons close to the quantum critical point in the quasi-one-dimensional spin-1/2 antiferromagnet NaVOPO_4

机译：双链临界点的双链临界点的Bose-einstein凝结 - 1/2反霉菌Navopo_4

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Structural and magnetic properties of a quasi-one-dimensional spin-1/2 compound NaVOPO4 are explored by x-ray diffraction, magnetic susceptibility, high-field magnetization, specific heat, electron spin resonance, and P-31 nuclear magnetic resonance measurements, as well as complementary ab initio calculations. Whereas magnetic susceptibility of NaVOPO4 may be compatible with the gapless uniform spin chain model, detailed examination of the crystal structure reveals a weak alternation of the exchange couplings with the alternation ratio alpha similar or equal to 0.98 and the ensuing zero-field spin gap Delta(0)/k(B) similar or equal to 2.4 K directly probed by field-dependent magnetization measurements. No long-range order is observed down to 50 mK in zero field. However, applied fields above the critical field H-c1 similar or equal to 1.6 T give rise to a magnetic ordering transition with the phase boundary T-N proportional to (H - H-c(1))(1/phi), where phi similar or equal to 1.8 is close to the value expected for Bose-Einstein condensation of triplons. With its weak alternation of the exchange couplings and small spin gap, NaVOPO4 lies close to the quantum critical point.

机译：通过X射线衍射，磁化率，高场磁化，特定热，电子自旋共振和P-31核磁共振测量来探索准一维旋转-1 / 2复合Navopo4的结构和磁性。以及互补的AB Initio计算。虽然Navopo4的磁化率可以与无间隙均匀的旋转链模型兼容，但是对晶体结构的详细检查揭示了交换比α相似或等于0.98的交换耦合的弱交替，并且随后的零场旋转间隙Delta（ 0）/ k（b）与现场磁化测量相似或直接探测2.4k。在零场中未观察到长距离的顺序到50 mk。然而，高于临界场H-C1类似或等于1.6 T的施加字段导致与（H - HC（1））（1 / phi）成比例的相位边界Tn的磁性有序转变，其中Phi相似或相等1.8接近Triplons的Bose-Einstein凝聚的预期值。随着交换联轴器的弱交替和小型旋转间隙，Navopo4靠近量子临界点。

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《Physical review》 |2019年第14期|144433.1-144433.14|共14页
作者
Mukharjee Prashanta Kumar; Ranjith K. M.; Koo B.; Sichelschmidt J.; Baenitz M.; Skourski Y.; Inagaki Y.; Furukawa Y.; Tsirlin A. A.; Nath R.;
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Indian Inst Sci Educ & Res Sch Phys Thiruvananthapuram 695551 Kerala India;

Max Planck Inst Chem Phys Solids Nothnitzer Str 40 D-01187 Dresden Germany;

Max Planck Inst Chem Phys Solids Nothnitzer Str 40 D-01187 Dresden Germany;

Max Planck Inst Chem Phys Solids Nothnitzer Str 40 D-01187 Dresden Germany;

Max Planck Inst Chem Phys Solids Nothnitzer Str 40 D-01187 Dresden Germany;

Helmholtz Zentrum Dresden Rossendorf Dresden High Magnet Field Lab HLD EMFL D-01314 Dresden Germany;

Kyushu Univ Fac Engn Dept Appl Quantum Phys Fukuoka Fukuoka 8190395 Japan|Iowa State Univ Ames Lab US DOE Ames IA 50011 USA;

Iowa State Univ Ames Lab US DOE Ames IA 50011 USA;

Univ Augsburg Ctr Elect Correlat & Magnetism Inst Phys Expt Phys 6 D-86135 Augsburg Germany;

Indian Inst Sci Educ & Res Sch Phys Thiruvananthapuram 695551 Kerala India;

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1. Bose-Einstein condensation of triplons close to the quantum critical point in the quasi-one-dimensional spin-1/2 antiferromagnet NaVOPO4 [J] . Mukharjee Prashanta Kumar, Ranjith K. M., Koo B., Physical review, B . 2019,第14期

机译：Bose-Einstein Triplons的凝结靠近准一维旋转1/2 antiferromagnet Navopo4中的量子临界点
2. Bose-Einstein condensation of triplons in the 5 = 1 tetramer antiferromagnet K_2Ni_2(MoO_4)_3: A compound close to a quantum critical point [J] . B. Koteswararao, P. Khuntia, R. Kumar, Physical review. B, Condensed Matter And Materals Physics . 2017,第18期

机译：5 = 1四聚体反铁磁体K_2Ni_2（MoO_4）_3中三元的玻色-爱因斯坦凝聚：一种接近量子临界点的化合物
3. Bose-Einstein condensation of triplons in the S=1 tetramer antiferromagnet K2Ni2(MoO4)(3): A compound close to a quantum critical point [J] . Koteswararao B., Khuntia P., Kumar R., Physical review, B . 2017,第18期

机译：在S = 1四聚氨酯k2Ni2（MOO4）（3）中的Triplons的Bose-einstein凝结凝聚率：靠近量子临界点的化合物
4. Quantum Phase Transitions of Quasi-One-Dimensional Heisenberg Antiferromagnets [C] . M. Matsumoto, S. Todo, C. Yasuda, Workshop on Computer Simulation Studies in Condensed-Matter Physics XVI . 2004

机译：准一维海森伯格反铁渣的量子相变
5. Superfluidity and Bose-Einstein condensation in optical lattices and porous media: A quantum Monte Carlo study. [D] . Shams, Ali A. 2010

机译：光学晶格和多孔介质中的超流动性和玻色-爱因斯坦凝聚：量子蒙特卡洛研究。
6. Gapless quantum spin liquid ground state in the two-dimensional spin-1/2 triangular antiferromagnet YbMgGaO4 [O] . Yuesheng Li, Haijun Liao, Zhen Zhang, -1

机译：二维自旋1/2三角反铁磁体YbMgGaO4中的无间隙量子自旋液体基态
7. Bose-Einstein condensation of triplons in the S=1 tetramer antiferromagnet K2Ni2(MoO4)(3): A compound close to a quantum critical point [O] . KOTESWARARAO, B, KHUNTIA, P, KUMAR, R, 2017

机译：S = 1四聚体反铁磁体K2Ni2（MoO4）（3）中三元体的Bose-Einstein缩合：一种接近量子临界点的化合物

Bose-Einstein condensation of triplons close to the quantum critical point in the quasi-one-dimensional spin-1/2 antiferromagnet NaVOPO_4

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