Interacting electron spins in k-(BEDT-TTF)_2Cu[N(CN)_2]I investigated by ESR spectroscopy

Lena Nadine Majer; Bjoern Miksch; Olga Iakutkina; Takuya Kobayashi; Atsushi Kawamoto; Martin Drcssel

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Interacting electron spins in k-(BEDT-TTF)_2Cu[N(CN)_2]I investigated by ESR spectroscopy

机译：通过ESR光谱研究k-（床T-TTF）_2CU [n（CN）_2] I的相互作用的电子旋转

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We performed angular and temperature-dependent electron-spin-resonance measurements in the quasi-two-dimensional organic conductor k-(BEI)T-TTF)_2Cu[N(CN)_2]I. The interlayer spin diffusion is much weaker compared to the Cl and Br analogs, which are antiferromagnetic insulator and paramagnetic metal, respectively; k-(BEDT-TTF)_2Cu[N(CN)_2]I behaves insulating when cooled below T = 200 K. A spin gap (△ ≈ 18 K) opens at low temperatures leading to a spin-singlet state. Due to intrinsic disorder a substantial number of spins (～1 %) remains unpaired. We observe additional signals below T = 4 K with a pronounced anisotropy indicating the presence of local magnetic moments coupled to some fraction of those unpaired spins.

机译：我们在准二维有机导体K-（BEI）T-TTF）_2CU [N（CN）_2] I中进行了角度和温度相关的电子 - 自旋共振测量。与CL和BR类似物相比，中间层自旋扩散分别与CL和BR类似物相比，它们分别是防铁磁绝缘体和顺磁金属; K-（BEDT-TTF）_2CU [n（CN）_2]当冷却以下T = 200K时，我在旋转间隙（△≈18k）下在导致旋转单态的低温下打开。由于内在疾病，大量的旋转（〜1％）仍然是未配对的。我们观察到以下T = 4 k以下的附加信号具有明显的各向异性，指示存在局部磁矩的存在，其耦合到这些未配对旋转的一小部分。

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《Physical review.B.Condensed matter and materials physics》 |2020年第21期|214430.1-214430.6|共6页
作者
Lena Nadine Majer; Bjoern Miksch; Olga Iakutkina; Takuya Kobayashi; Atsushi Kawamoto; Martin Drcssel;
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I. Phvsikalisches Institut Universitaet Stuttgart Pfaffenwaldring 57 70569 Stuttgart Germany;

I. Phvsikalisches Institut Universitaet Stuttgart Pfaffenwaldring 57 70569 Stuttgart Germany;

I. Phvsikalisches Institut Universitaet Stuttgart Pfaffenwaldring 57 70569 Stuttgart Germany;

Graduate School of Science and Engineering Saitama University Saitama 338-8570 Japan;

Department of Condensed Matter Physics Graduate School of Science Hokkaido University Sapporo 060-0810 Japan;

I. Phvsikalisches Institut Universitaet Stuttgart Pfaffenwaldring 57 70569 Stuttgart Germany;

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1. Microscopic observation of superconducting fluctuations in k-(BEDT-TTF)_2Cu[N(CN)_2]Br by ~(13)C NMR spectroscopy [J] . T. Kobayashi, Y. Ihara, Y. Saito, Physical review . 2014,第16期

机译：用〜（13）C NMR光谱显微镜观察k-（BEDT-TTF）_2Cu [N（CN）_2] Br中的超导涨落
2. Lattice Dynamics Coupled to Charge and Spin Degrees of Freedom in the Molecular Dimer-Mott Insulator k-(BEDT-TTF)2Cu[N(CN)2]C1 [J] . Matsuura Masato, Sasaki Takahiko, Iguchi Satoshi, Physical review letters . 2019,第2期

机译：晶格动力学耦合到分子二聚体绝缘体K-（床T-TTF）2CU [N（CN）2] C1中的充电和旋转自由度.C1
3. Inhomogeneous electronic state of organic conductor κ-(BEDT-TTF)_2Cu[N(CN)_2]I studied by ~(13)C NMR spectroscopy [J] . Kobayashi T., Suzuta A., Tsuji K., Physical review . 2019,第19期

机译：有机导体的不均匀电子状态κ-（床位-TTF）_2CU [N（CN）_2] I通过〜（13）C NMR光谱研究
4. THE STUDY OF THE MAGNETIC BREAKDOWN EFFECT AS A FUNCTION OF ANGLE IN THE ORGANIC CONDUCTOR K- (BEDT-TTF)_2Cu( NCS)_2 IN HIGH MAGNETIC FIELDS [C] . I. MIHUT, C. C. AGOSTA, C. H. MIELKE, The Fourth Conference on Physical Phenomena at High Magnetic Fields - IV (PPHMF-IV) Oct 19-25, 2001 Santa Fe, New Mexico, USA . 2001

机译：高磁场下有机导体K-（BEDT-TTF）_2Cu（NCS）_2中角的作用对电磁击穿作用的研究
5. Symetries du gap supraconducteur dans le compose k-(BEDT-TTF)2Cu(NCS)2. [D] . Dion, Maxime. 2009

机译：化合物k-（BEDT-TTF）2Cu（NCS）中超导间隙的对称性2。
6. Assessment of oxidative stress and antioxidant property using electron spin resonance (ESR) spectroscopy [O] . Masaichi-Chang-il Lee 2013

机译：使用电子自旋共振（ESR）光谱评估氧化应激和抗氧化性能
7. Influence of the cooling rate on low-temperature Raman and infrared reflection spectra of partially deuterated k-(BEDT-TTF)_2Cu[N(CN)_2]Br [O] . Maksimuk, M., Yakushi, K., Taniguchi, H., 2003

机译：冷却速度对低温拉曼和红外光谱的影响部分氘代k-（BEDT-TTF）_2Cu [N（CN）_2] Br的反射光谱
8. Tunneling Spectroscopy on an Organic Superconductor (BEDT-TTF)2Cu(NCS)2 [R] . Bando, H., Kashiwaya, S., Tokumoto, H., 1989

机译：有机超导体（BEDT-TTF）2Cu（NCs）上的隧道谱

Interacting electron spins in k-(BEDT-TTF)_2Cu[N(CN)_2]I investigated by ESR spectroscopy

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