Distinctive orbital anisotropy observed in the nematic state of a FeSe thin film

Zhang, Y.; Yi, M.; Liu, Z. -K.; Li, W.; Lee, J. J.; Moore, R. G.; Hashimoto, M.; Nakajima, M.; Eisaki, H.; Mo, S. -K.; Hussain, Z.; Devereaux, T. P.; Shen, Z. -X.; Lu, D. H.

doi:10.1103/PhysRevB.94.115153

Distinctive orbital anisotropy observed in the nematic state of a FeSe thin film

Journal Article · Mon Sep 26 00:00:00 EDT 2016 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.94.115153· OSTI ID:1377500

Zhang, Y. ^[1]; Yi, M. ^[2]; Liu, Z. -K. ^[2]; Li, W. ^[3]; Lee, J. J. ^[2]; Moore, R. G. ^[3]; Hashimoto, M. ^[4]; Nakajima, M. ^[5]; Eisaki, H. ^[5]; Mo, S. -K. ^[6]; Hussain, Z. ^[6]; Devereaux, T. P. ^[2]; Shen, Z. -X. ^[2]; Lu, D. H. ^[4]

SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Inst. for Materials and Energy Sciences; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source
SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Inst. for Materials and Energy Sciences; Stanford Univ., CA (United States). Dept. of Physics and Dept. of Applied Physics
SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Inst. for Materials and Energy Sciences
SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Synchrotron Radiation Lightsource
National Inst. of Advanced Industrial Science and Technology (AIST), Tsukuba (Japan); Japan Science and Technology Agency (JST), Tokyo (Japan)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source

Nematic state, where the system is translationally invariant but breaks the rotational symmetry, has drawn great attentions recently due to experimental observations of such a state in both cuprates and iron-based superconductors. The mechanism of nematicity that is likely tied to the pairing mechanism of high-T_c, however, still remains controversial. Here, we studied the electronic structure of multilayer FeSe film by angle-resolved photoemission spectroscopy (ARPES). We found that the FeSe film enters the nematic state around 125 K, while the electronic signature of long range magnetic order has not been observed down to 20K indicating the non-magnetic origin of the nematicity. The band reconstruction in the nematic state is characterized by the splitting of the d_xz and d_yz bands. More intriguingly, such energy splitting is strong momentum dependent with the largest band splitting of ~80 meV at the zone corner. The simple on-site ferro-orbital ordering is insufficient to reproduce the nontrivial momentum dependence of the band reconstruction. Instead, our results suggest that the nearest-neighbor hopping of d_xz and d_yz is highly anisotropic in the nematic state, the origin of which holds the key in understanding the nematicity in iron-based superconductors.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: AC02-05CH11231; AC02-76SF00515

OSTI ID:: 1377500

Alternate ID(s):: OSTI ID: 1326699
OSTI ID: 1393078

Journal Information:: Physical Review B, Journal Name: Physical Review B Journal Issue: 11 Vol. 94; ISSN 2469-9950; ISSN PRBMDO

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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